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  • Impurity ions effect on CO2 mineralization via coupled reaction-extraction-crystallization process of CaCl2 waste liquids
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-19
    Chunhua Dong, Xingfu Song, Yunzhao Li, Chenglin Liu, Hang Chen, Jianguo Yu

    The CaCl2-rich distiller waste discharged in the Solvay process has not been recycled comprehensively. A novel CO2 mineralization route with waste CaCl2 solutions via coupled reaction-extraction-crystallization technique was proposed. The effect of Na+, K+, Mg2+, Al3+, NO3− and SO42− ions which exist in the distiller waste on the conversion of CaCl2 as well as the morphology of product CaCO3 was studied with the aid of titration, Scanning Electron Microscope (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Particle Size Analyzer, X-ray Diffractometer (XRD), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and Thermogravimetry (TG). Among the ions, Na+, K+ and NO3- have little influence that could be ignored. Both Al3+ and SO42− are adsorbed on the surface of vaterite and inhibit the transformation to calcite by lowering down the surface energy. Therefore, small particles with diameters of less than 10 μm even 1 μm which are hard to be filtered are formed. While for Mg2+, the effect is negligible when the content is less than 5 wt %. However, as the content increases, Mg2+ could not only be adsorbed on the surface but also insert into the crystal lattice of CaCO3, forming the worm-like Mg-calcite. Finally, the experiment of simulated distiller waste was investigated to take a very important step towards industrialization.

    更新日期:2018-07-20
  • Graphene oxide modified cobalt metallated porphyrin photocatalyst for conversion of formic acid from carbon dioxide
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-17
    Santosh Kumar, Rajesh K. Yadav, Kirpa Ram, António Aguiar, Joonseok Koh, Abilio J.F.N. Sobral

    An increasingly level of one of the important greenhouse gas, CO2, in the atmosphere from anthropogenic human activities has several adverse consequences and thus, chemical transformation of carbon dioxide into useful, renewable and environmentally friendly products is becoming an important research problem. In the present investigation, we have developed photocatalyst of graphene oxide modified with cobalt metallated aminoporphyrin (GO-Co-ATPP) for conversion of CO2 to formic acid under visible light. The efficiency of nanohybrid photosynthetic conversion of formic acid from carbon-dioxide is 96.49 μmol for 2 h. We have used XRD, SEM, HR-TEM, AFM, thermogravimetric analysis, BET measurement to establish the structural and physical properties along with infrared spectroscopy and Raman spectroscopy for chemical properties of GO-Co-ATPP. The photocatalyst was significantly effective for NADH photoregeneration with cumulative 48.53% over time and photoelectrochemical measurement showed photocurrent properties. These results strongly suggest that the GO-Co-ATPP photocatalyst materials may open new vistas in conversion of CO2 into useful and environmentally friendly products as well as energy applications.

    更新日期:2018-07-19
  • Solvent effects on the coupling reaction of CO2 with PO catalyzed by hydroxyl imidazolium ionic liquid: Comparison of different models
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-17
    Danning Zheng, Jingshun Zhang, Xinrui Zhu, Tiegang Ren, Li Wang, Jinglai Zhang

    Although the mechanism of coupling reaction of carbon dioxide with propylene oxide catalyzed by 1-(2-hydroxyl-ethyl)-3-methylimidazolium chloride (HEMIMC) ionic liquids has been elucidated previously, there are two major drawbacks. One is that the solvent effect is treated by the existed solvent model rather than the real HEMIMC ionic liquids. The other one is that the influence of interactions between ionic liquids on the catalysis is not considered, which has been testified to be important in the catalytic process. So the mechanism is explored by Double-IL model and Cluster-IL model again to fully consider the interactions among ionic liquids. The Cluster-IL model is firstly employed in this work. Then, the HEMIMC are incorporated in Double-IL model and Cluster-IL model as the solvent, respectively, although it is very expensive for the computational cost. Our central aim we aimed to compare the difference among different catalytic models, to consider the solvent effect aroused by ionic liquids, and to improve the reliability of theoretical prediction.

    更新日期:2018-07-19
  • Comprehensive study of CO2 capture performance under a wide temperature range using polyethyleneimine-modified adsorbents
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-14
    Yuan Meng, Jianguo Jiang, Yuchen Gao, Feng Yan, Nuo Liu, Aikelaimu Aihemaiti

    Amine functional adsorbents for CO2 capture have attracted increasing attention as a possible alternative to aqueous amine. Temperature has been proven to be an important parameter that affects the CO2 capture performance, but previous studies often yielded different optimal temperature ranges during texting and lacked multiple evaluation indicators for adsorption performance. In this study, we prepared silica modified with different loadings (10–55%) and molecular weights (600–25000 Da) of polyethyleneimine (PEI) to compare the adsorption performance under a wide temperature range (30–120 °C), which covered the temperature requirements in most applications of CO2 capture and separation. To evaluate these adsorbents comparatively, CO2 adsorption capacity, CO2 adsorption kinetics, thermal stability and cyclic adsorption-desorption stability were determined. In general, the adsorbents with higher PEI loadings and molecular weights, such as 45–55 wt.% loadings or 1200–25000 Da molecular weights, were more suitable for CO2 capture at relatively high temperatures, such as 90–120 °C. However, the performance of these adsorbents was not as good as several other adsorbents with lower PEI loadings or molecular weights for application at lower temperature, such as in CO2 capture at ambient temperature. In addition, the essential reasons for the influence of temperature were also investigated based on the inherent properties of the adsorbents. The suppression effect and the promotion effect were proposed to explain why the optimum temperature ranges of the adsorbents were so different.

    更新日期:2018-07-15
  • High-pressure CO2 assisted extraction as a tool to increase phenolic content of strawberry-tree (Arbutus unedo) extracts
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-14
    A.M.R.C. Alexandre, A. Matias, C.M.M. Duarte, M.R. Bronze

    Arbutus unedo fruits, commonly known as strawberry-tree fruits, can be used as raw material for the development of bioactive ingredients, besides other traditional applications. In this work, a high-pressure CO2 Assisted Extraction process (HPCDAE) was investigated in order to find the best process conditions to obtain extracts with a higher phenolic content (TPC) and antioxidant activity. The process parameters studied were pressure (100, 175 and 250 bar), temperature (40 °C, 55 °C and 70 °C) and volume solid:liquid (S:L)/CO2 ratios (20, 50 and 80%) and the extracts recovered compared with the extract obtained with a S:L conventional extraction. Results show that when the highest pressure (250 bar) temperature (70 °C) and lowest S:L/CO2 ratio (20%) are used, HPCDAE increases 1.41 times TPC of the extracts, compared to conventional S-L extract. A significant increase in the extraction of galloyl hexoside and 5-O-galloylquinic acid were observed after HPCDAE application. The intensification of both compounds extraction may be related with the increase in the antioxidant activity of the extracts. The results from this study show that HPCDAE is a promising tool to intensify the extraction of bioactive compounds from strawberry tree fruits.

    更新日期:2018-07-15
  • Highly selective conversion of CO2 to lower hydrocarbons (C2-C4) over bifunctional catalysts composed of In2O3-ZrO2 and zeolite
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-14
    Jianyang Wang, Anfeng Zhang, Xiao Jiang, Chunshan Song, Xinwen Guo

    Although many researchers have reported CO2 hydrogenation to various C1 chemicals, it is still challenging to directly and selectively convert CO2 to C2-C4 hydrocarbons in terms of overcoming the extreme inertness of CO2 and a high CC coupling barrier. In the present work, we report an efficient integration of methanol-synthesis and the methanol-to-hydrocarbons with the bifunctional catalyst component of In2O3-ZrO2 and SAPO-5. These tandem reactions exhibit an excellent relative selectivity of C2-C4 (83%) with a suppressed CH4 relative selectivity less than 3% at T = 300 °C. A detailed analysis indicates that the partially reduced indium oxide surface (In2O3-ZrO2) can better activate CO2 and promote the synthesis of methanol than In2O3 alone, and CC coupling is subsequently manipulated within the confined acidic pores of SAPO-5 according to XRD, H2-TPR, CO2-TPD, SEM and TEM. Furthermore, the proximity of two components and the content of Si also play an important role in such outstanding selectivity to C2-C4. Our study paves a new path for the direct synthesis of lower hydrocarbons.

    更新日期:2018-07-15
  • Shear bond strength of oil well cement in carbonic acid environment
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-13
    Jueun Hwang, Ramadan Ahmed, Sagar Tale, Subhash Shah

    Shear Bond Strength (SBS) is an important property of cement that determines the life of oil and gas wells. This paper presents the results of an experimental study on the effect of carbonation on the SBS of cement under high-pressure high-temperature (HPHT) condition. The study is aimed at examining the effects of CO2 concentration, temperature, and pressure on SBS of cement containing 35% of silica flour. The study was conducted by aging two types of specimens (i.e. cement cores and SBS samples made of steel pipe and cement). After curing, the specimens were aged for 14 days in an autoclave. The autoclave was 80% filled with brine saturated with mixed gas containing CO2 and CH4. Aging pressure (21–62 MPa), temperature (38–221 °C) and CO2 concentration (10–100% CO2) were varied. After aging, the specimens were recovered, and their SBS, porosity and mineralogical composition were determined to assess the level of carbonation and degradation.To identify the most dominant factor affecting the SBS of cement, measurements were analyzed applying the Analysis of Variance (ANOVA) method. The analysis showed that temperature has a more prominent effect on the carbonation process than pressure and CO2 concentration. Furthermore, results showed strong interaction effect among the main influential factors (pressure, temperature and CO2 concentration). SBS increased with the carbonation. Medium-range temperatures (107 and 177 °C) caused high levels of carbonation as manifested by huge improvement in SBS and a significant reduction in porosity after exposure to a carbonic acid environment.

    更新日期:2018-07-14
  • Energy storage through CO2 electroreduction: A brief review of advanced Sn-based electrocatalysts and electrodes
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-10
    Qingqing Li, Xufeng Rao, Jiawei Sheng, Jie Xu, Jin Yi, Yuyu Liu, Jiujun Zhang

    As fossil fuel usage continues to increase on a global scale, effective CO2 conversion methods become increasingly important as many different avenues are being actively explored. In the case of CO2 reduction, Sn-based electrocatalysts and their associated electrodes have shown great promise. In this review, recent progresses in Sn-based electrocatalysts and their associated electrodes for CO2 reduction are briefly reviewed with a focus on catalyst synthesis, electrode fabrication, and electrocatalytic performance. Sn-based catalytic performance is greatly affected by the structure, morphology and composition of the catalyst, which in turn are strongly dependent on synthesis strategies and processes. Here, three catalyst synthesis methods: hydrothermal, electrodeposition and plasma treatment methods will be discussed and analyzed. Furthermore, electrode fabrication methods using Sn-based catalysts for CO2 electroreduction will also be discussed to optimize catalytic activity, stability, and product selectivity so as to maximize CO2 electroreduction performance. Finally, several technical challenges are analyzed and future research directions are proposed to facilitate further research and development toward the practical usage of Sn-based catalysts.

    更新日期:2018-07-12
  • Numerical investigation of CO2 valorization via the steam gasification of biomass for producing syngas with flexible H2 to CO ratio
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-09
    Shakirudeen A. Salaudeen, Bishnu Acharya, Mohammad Heidari, Precious Arku, Animesh Dutta

    This work presents a numerical investigation into CO2 valorization via the gasification of poplar wood. It is aimed at determining an optimum gasification condition for enhancing the production of syngas with a flexible H2 to CO molar ratio (H2/CO), which is essential in many petrochemical processes. The research is performed by simulation in ASPEN Plus, where steam and CO2 are fed as co-gasifying agents. The equilibrium concentrations of the product gas are obtained, and the H2/CO as well as the heating value of the resulting syngas are quantified. It is found that the inclusion of CO2 as a co-gasifying agent promotes CO evolution through the Boudouard reaction. However, it reduces H2 concentration, and consequently decreases the H2/CO. Furthermore, the effects of some process parameters have been studied in this work. It is observed that H2/CO reduces with a rise in temperature, increases with increasing CO2 to biomass ratio (CBR), and shows no significant change with pressure. Results further show that methanol synthesis from syngas can be achieved at temperatures close to 660 °C, while oxo-synthesis requires a higher temperature. A CBR of around 0.6 in the present work would be an optimum value for Fischer-Tropsch synthesis to achieve a H2/CO of 2:1, but the CBR should be lower for processes requiring a lower H2/CO like acetic acid formation and oxo-synthesis.

    更新日期:2018-07-12
  • Electrochemical impedance spectroscopy as a tool to investigate the electroreduction of carbon dioxide: A short review
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-09
    Adriano Sacco

    Carbon dioxide electroreduction (CO2ER) exploited in conjugation with renewable energy sources can open the path to a carbon-neutral energy cycle, concurrently offering the possibility to synthesize low-carbon fuels. In the last decades, a huge amount of work has been carried out by the scientific community in order to obtain high-performing and low-cost catalysts, and to design reactors able to maximize the efficiency of CO2ER. Electrochemical impedance spectroscopy (EIS) proved to be a useful tool in studying this electrochemical reaction, and has been widely employed to characterize novel materials and reactor architectures. The aim of this Review is to provide an insight on the application of EIS for the study of CO2ER. A brief introduction on the technique and on the reaction will be given, followed by a review of the most important applications in this field. Finally, a brief discussion of future research directions will be presented.

    更新日期:2018-07-12
  • Plasmonic gold deposited on mesoporous TixSi1−xO2 with isolated silica in lattice: An excellent photocatalyst for photocatalytic conversion of CO2 into methanol under visible light irradiation
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-07
    Rajkumar Yadav, Vipin Amoli, Jitendra Singh, Manish Kumar Tripathi, Piyali Bhanja, Asim Bhaumik, Anil Kumar Sinha

    Solar-driven chemical production of methanol from CO2 has become a hot topic of research due to high-value addition, with methanol as a product, as well as reduction of CO2 which is a greenhouse gas. Here we report gold nanoparticles deposited on mesoporous titania with isolated Si sites, which converted CO2 into methanol under visible light irradiation using LED light source. Si amount in titania lattice was optimized to obtain the best methanol yield. DFT calculation showed that Si sites incorporation was responsible for higher adsorption of CO2 onto the surface, which was further proved experimentally with CO2 uptake results. We achieved highest methanol production of 1835 μmolgcat−1 using Au/TixSi1−xO2 material with 28 mol% Si in titania lattice and 1.0 wt% Au nanoparticles deposition. The Au/TixSi1−xO2 photocatalysts were thoroughly characterized by inductively coupled plasma atomic emission (ICP-AES) spectrometry, powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), high angle annular dark field-scanning transmission electron microscopic (HAADF-STEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), 29Si MAS NMR, UV-vis diffuse reflection spectroscopy (DRS), N2 sorption studies, CO2 uptake experiments, cyclic voltammetry (CV) and DFT calculations. The products were analyzed by GC-FID, GC–MS, and HPLC. The photocatalytic reaction was monitored using in situ FT-IR which established the formation of formaldehyde as an intermediate product which further converted into methanol.

    更新日期:2018-07-12
  • Understanding the role of Ni-Sn interaction to design highly effective CO2 conversion catalysts for dry reforming of methane
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-04
    Utsab Guharoy, Estelle Le Saché, Qiong Cai, Tomas Ramirez Reina, Sai Gu

    CO2 reforming of methane is an effective route for carbon dioxide recycling to valuable syngas. However conventional catalysts based on Ni fail to overcome the stability requisites in terms of resistance to coking and sintering. In this scenario, the use of Sn as promoter of Ni leads to more powerful bimetallic catalysts with enhanced stability which could result in a viable implementation of the reforming technology at commercial scale. This paper uses a combined computational (DFT) and experimental approach, to address the fundamental aspects of mitigation of coke formation on the catalyst’s surface during dry reforming of methane (DRM). The DFT calculation provides fundamental insights into the DRM mechanism over the mono and bimetallic periodic model surfaces. Such information is then used to guide the design of real powder catalysts. The behaviour of the real catalysts mirrors the trends predicted by DFT. Overall the bimetallic catalysts are superior to the monometallic one in terms of long-term stability and carbon tolerance. In particular, low Sn concentration on Ni surface effectively mitigate carbon formation without compromising the CO2 conversion and the syngas production thus leading to excellent DRM catalysts. The bimetallic systems also presents higher selectivity towards syngas as reflected by both DFT and experimental data. However, Sn loading has to be carefully optimized since a relatively high amount of Sn can severely deter the catalytic performance.

    更新日期:2018-07-12
  • Synthesis of oligo(carbon dioxide)
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-09
    Yinghao Fu, Congming Xiao

    For the first time, we reported the preparation of the oligomer of carbon dioxide. The oligomerization of carbon dioxide was carried out with the aid of the synergetic catalysis of 1,8-diazabicyclo(5, 4, 0)undec-7-ene (DBU) and quaternary salt of water-soluble chitosan (QWSC), which was conducted at 75 °C for 24 h by using petroleum ether as dispersing medium. The product was separated and purified through repeated dissolution-precipitation by using dichloromethane, petroleum ether and distilled water as solvents and precipitant respectively. Fourier transform infrared spectroscopy (FTIR), fluorescence spectroscopy, carbon nuclear magnetic resonance (13CNMR), and MALDI-TOF spectrometry (MS) was applied to characterize the product. The results confirmed that the obtained product was the expected oligomer of CO2, linear H-(O-CO)17-H and cyclic (O-CO)13 containing DBU-like group.

    更新日期:2018-07-12
  • Slurry methanol synthesis from CO2 hydrogenation over micro-spherical SiO2 support Cu/ZnO catalysts
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-07-03
    Ying Jiang, Haiyan Yang, Peng Gao, Xiaopeng Li, Jianming Zhang, Hongjiang Liu, Hui Wang, Wei Wei, Yuhan Sun
    更新日期:2018-07-12
  • Model for calculating the wellbore temperature and pressure during supercritical carbon dioxide fracturing in a coalbed methane well
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-27
    Zhao-Zhong Yang, Liang-Ping Yi, Xiao-Gang Li, Yu-Ting Chen, Jun Sun

    Supercritical CO2 fracturing can form a more complex fracture network in rocks than hydraulic fracturing and avoid aqueous phase trapping damage in reservoirs. Thus, it is a promising alternative to hydraulic fracturing for enhancing the production of low-permeability hydrocarbon reservoirs. In this study, a new numerical model for predicting the wellbore temperature and pressure during supercritical CO2 fracturing was established based on thermodynamics, heat transfer, fluid mechanics, and a numerical solution method. In the new model, the physical properties of CO2 are calculated with the Span–Wagner and Vesovic models, and the heat generated by fluid friction losses is absorbed by the tubing and CO2 according to the contact coefficient. The model was used to examine the influences of the injection rate and temperature on the wellbore pressure and temperature. The results indicated that both the heat transfer and pressure in the wellbore are transient processes in the initial stage of injection; as the injection time increases, the heat transfer and pressure in the wellbore can be considered steady processes. The CO2 temperature in the wellbore is considerably affected by both the injection temperature and rate, whereas the wellbore pressure is greatly affected by the injection rate but weakly affected by the injection temperature. The CO2 pressure in the wellbore decreases rapidly as the well depth increases because of high fluid frictional resistance, so a drag reducer suitable for liquid CO2 needs to be developed.

    更新日期:2018-07-12
  • Incorporation of CO2 during the production of succinic acid from sustainable oil palm frond juice
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-26
    Jian Ping Tan, Abdullah Amru Indera Luthfi, Shareena Fairuz Abdul Manaf, Ta Yeong Wu, Jamaliah Md. Jahim

    The utilization of the juice from the cheapest carbon source oil palm frond (22 $/ton) in a 3.5 L bioreactor was proven to be competent in replacing pure sugar in succinic acid production. The current study provides an in-depth discussion on the utilization of CO2 in the production of succinic acid. In the serum-bottle fermentation, the yield of succinic acid increased by 51% from 0.47 to 0.71 g/g while the final titer of succinic acid enhanced by 4 fold were attributed to the anaplerotic reaction of Actinobacillus succinogenes and the alkalinity effect of the dissolved CO2. In the bioreactor, the highest mass transfer in the fermentation medium was achieved at 0.5 vvm CO2 at which 3 M KOH was pumped in at a rate of 2.0 mL/min to neutralize the carbonic acid formation, which afforded the highest succinic acid concentration of 30.7 g/L. A first report on actual stoichiometry equation relating substrate, CO2 consumption and all products formation was derived from the results of bioreactor fermentation to lay as a guideline for future reference of actual succinic acid production reaction. C6H12O6 + 0.145 NH3 + 0.642 CO2 → 1.083 C4H6O4 + 0.509 CH2O2 + 0.420 C2H4O2 + 0.117 C2H5OH + 0.726 CH1.8N0.2O0.5 + 0.614 H2O. Actual stoichiometry equation revealed that for every kg of succinic acid produced, 0.22 kg of CO2 will be absorbed. The desirable effect of CO2 on the production of succinic acid may translate into a mutually-beneficial relationship between the succinic acid and the CO2-generating biofuel industries.

    更新日期:2018-07-12
  • Li-modified nanoporous carbons for high-performance adsorption and separation of CO2 over N2: A combined DFT and GCMC computational study
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-26
    Xuefeng Liu, Shuxian Wei, Sainan Zhou, Zhonghua Wu, Maohai Wang, Zhaojie Wang, Jiahui Wang, Xiaoqing Lu

    We reported the construction and analysis of nanoporous carbons (NPCs) modified with 1, 2, 4 physical and 2, 4, 6 chemical Li dopants by using density functional theory and grand canonical Monte Carlo simulations. We found that Li-modified NPCs created conducive environments for CO2 adsorption and separation over N2, and chemical doping was superior to physical doping at the same doping number of Li. By calculating, we found that adsorption capacity and separation were determined according to the synergistic effect of pore characteristics, doping method, and quantity of Li. The saturated adsorption of CO2 follows the sequence Chem_6Li > Chem_4Li > Chem_2Li ≈ Phys_2Li > Phys_4Li > Phys_1Li > NPC. Among Li-modified NPCs at 298 K and dynamic equilibrium state, Chem_6Li exhibited the best CO2 adsorption capacity of ∼35 and selectivity of ∼200 over N2 with CO2/N2 ratios of 50:50 and 15:85. Our calculation results highlighted the potential of Li doping as an excellent candidate for improving NPCs in carbon capture and separation.

    更新日期:2018-07-12
  • Mechanism of supercritical carbon dioxide (SC-CO2) hydro-jet fracturing
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-26
    Can Cai, Yong Kang, Xiaochuan Wang, Yi Hu, Hao Chen, Xiaohong Yuan, Yang Cai

    Supercritical Carbon Dioxide (SC-CO2) hydro-jet fracturing can increase gas production and reduce carbon dioxide emission, and is considered as a promising alternative for shale gas exploration. SC-CO2 hydro-jet fracturing technology has resulted in multi-fracture network in the YanChang Well of Ordos Basin, China. However, the mechanism of SC-CO2 hydro-jet fracturing is still not clear. To address the problem, experiments and specimens were designed based on Orthogonal Experimental Design (OED) to investigate the influential factors, including jet pressure (Pin), jet distance (S), nozzle diameter (dn), perforation length (L) and perforation diameter (dperf). In addition, the evaluation indexes, ambient pressure and the fracture profile were deeply discussed. The investigation results indicated that crack initiation on the root of perforation was prevented by the higher SC-CO2 jet pressure. Particularly, when the nozzle diameter was more than the inlet diameter of casing (3 mm), the crack number on perforation dropped sharply. When the optimal perforation length and perforation diameter were respectively 50 mm and 6 mm, the peak values of the crack number and distribution range were observed. The results of Analysis of Variance (ANOVA) demonstrated that jet pressure and perforation length were the main influential parameters. With the increase in ambient pressure, the threshold pressure of fracture initiation increased. Three patterns of crack extension directions were found in the experimental specimens: surface fracture, longitudinal fracture, and transverse fracture.

    更新日期:2018-07-12
  • Substrate dependence on the fixation of CO2 to cyclic carbonates over reusable porous hybrid solids
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-26
    Joel M. Kolle, Abdelhamid Sayari

    N,N,N-tributyl-N-propylammonium iodide-functionalized mesoporous silicas (SBA-15 and a silica gel) proved to be efficient, robust and reusable catalysts for the solvent-free synthesis of cyclic carbonates (CCs) from epoxides and CO2. The reusability of the catalysts was found to be dependent on the nature of the support and the substrate. In the presence of 1,2-epoxybutane (1,2-EB) as substrate, the SBA-15-based catalyst (PHS-1) exhibited a constant catalytic activity for five reaction cycles (yield > 96.0%) under mild conditions (1.0 MPa CO2, 100 °C and 4 h). Conversely, in the presence of styrene oxide, a gradual decrease in yield was observed. Based on textural properties and 13C CP-MAS NMR measurements, such decline was attributed to the adsorption of solid reaction product (styrene carbonate - SC) on the catalyst surface. Using a chromatographic silica gel as support and an improved catalyst recovery step gave rise to a highly efficient, robust and fully reusable catalyst (PHS-2) for the synthesis of CCs. Notably, PHS-2 led to a 33–50% decrease in reaction time, and maintained an excellent and steady catalytic activity over 5 cycles in the synthesis of SC (yield > 96% and selectivity > 97%). The amount of trapped solid SC product on PHS-2 surface was also significantly reduced.

    更新日期:2018-07-12
  • Solar thermochemical CO2 splitting using cork-templated ceria ecoceramics
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-23
    Fernando A. Costa Oliveira, Maria Alexandra Barreiros, Stéphane Abanades, Ana P.F. Caetano, Rui M. Novais, Robert C. Pullar

    This work addresses the solar-driven thermochemical production of CO and O2 from two-step CO2-splitting cycles, using both ceria granules prepared from cork templates (CG) and ceria foams from polyurethane templates (CF). These materials were cycled in a high-temperature indirectly-irradiated solar tubular reactor using a temperature-swing process. Samples were typically reduced at 1400 °C using concentrated solar power as a heating source and subsequently oxidised with CO2 between 1000–1200 °C. On average, CO production yields for CG were two times higher than for CF, indicating that the morphology of this three-dimensionally ordered macroporous (3-DOM) CeO2 improves the reaction kinetics. Their performance stability was demonstrated by conducting 11 cycles under solar irradiation conditions. Slightly increasing the reduction temperature strongly enhanced the reduction extent, and thus the CO production yield (reaching about 0.2 mmol g−1 after reduction at 1450 °C in inert gas), while decreasing the oxidation temperature mainly improved the CO production rate (up to 1.43 μmol s−1 g−1 at 1000 °C). Characterisation of the 3-DOM structure, by means of XRD and SEM, provided insights into the reactivity behaviour of the developed materials. The pre-sintered ceria granules retained their structure after cycling. The fact that the mean cell size of CG is smaller (at least one order of magnitude) than that of CF suggests that its exposed surfaces enhanced reaction rates by a factor of two. Moreover, the maximum fuel production rate of CG was roughly three times greater than that reported previously for a ceria reticulated porous foam with dual-scale porosity.

    更新日期:2018-07-12
  • Enhanced activity of Mg-Fe-O ferrites for two-step thermochemical CO2 splitting
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-22
    Jincheng Huang, Yu Fu, Shenggang Li, Wenbo Kong, Jun Zhang, Yuhan Sun

    Fe-based ferrites have been investigated as the most promising and active redox materials for two-step thermochemical CO2 splitting. Reactions are conducted in a two-step cycle, in which the ferrites are generally reduced at 1400 °C in an inert atmosphere, then the reduced ferrites are re-oxidized by reacting with CO2 at 1000 °C to produce CO. In this work, Mg-Fe-O ferrites (designated as FM-x, x denotes as the mole fraction of Fe2O3 to MgO + Fe2O3) were screened for activity in two-step thermochemical CO2 splitting. Ferrites were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman and Mössbauer spectroscopies. The self-regenerative function and internal reaction, which are responsible for the initial higher CO production rate and a greater utilization of the bulk ferrites, respectively, were confirmed for Mg-Fe-O ferrites. Consequently, the self-regenerative FM-0.2 with internal reaction possesses a 2.2 times higher CO yield as compared with that of FM-0.5. Kinetic analysis was conducted in consideration of various solid state reaction models, and bulk diffusion, which is an indication of internal reaction, was found to be the crucial factor for the accessibility of the bulk redox species.

    更新日期:2018-07-12
  • Application of CO2-storage materials as a novel plant growth regulator to promote the growth of four vegetables
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-21
    Long Zhao, Chang Liu, Xiaoqing Yue, Liang Ma, Yu Wu, Tingyu Yang, Jianbin Zhang

    In the present work, CO2-storage materials (CO2SMs) obtained from CO2 capture were applied as energy sources to facilely boost the growth of four vegetables including eggplant, tomato, pimiento, and cucumber. The effects of CO2SMs on the vegetable growth were determined by irrigating plants with different CO2SMs fertilizers for 60 d using water and NH4HCO3 as the control groups. The results indicated that all CO2SM fertilizers dramatically promoted the plant growth of the tested vegetables in terms of plant height, stem diameter, and root development. Further investigation revealed that CO2 in CO2SMs functioned as an indirect energy source to improve the root development, which increased the absorption of nutrients from the soil to further promote both vegetative growth florescence and yield. Our work has provided a new strategy for CO2 utilization as an indirect energy source.

    更新日期:2018-07-12
  • Techno-economic and environmental evaluation of CO2 mineralization technology based on bench-scale experiments
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-19
    Ji Hyun Lee, Jay H. Lee, In Kee Park, Chang Hyun Lee

    This work presents a techno-economic & environmental analysis of a CO2 mineralization process, intended to examine its potential for CO2 reduction and economic feasibility. The CO2 mineralization technology of this study is composed of the CO2 carbonation process and the brine electrolysis process, producing various chemical compounds such as sodium bicarbonate, hydrogen, and chlorine. Notably, the CO2 mineralization process is able to utilize flue gas with a low concentration of CO2 that has not been subjected to CO2 capture processes. For the technical feasibility analysis of the CO2 mineralization process examined in the study, performance evaluation is conducted for a bench-scale CO2 mineralization test unit (2 kg/day CO2 utilization capacity), yielding sodium bicarbonate of over 97% purity. It is also estimated that the CO2 utilization process of this study produces 0.65 tons of CO2 emissions per ton of sodium bicarbonate produced, which indicates a 2.09 ton CO2 reduction compared to the conventional processes which produce 2.74 tons of CO2 emissions for the same amount of sodium bicarbonate production. With these results as a basis, an economic evaluation is conducted for a commercial-scale CO2 utilization plant (sodium bicarbonate production capacity: approximately 5000 tons/year) which utilizes CO2 in flue gas produced from thermal power plants. The evaluation supports the economic feasibility of the process with a benefit/cost ratio (B/C ratio) of 1.12 and internal rate of return (IRR) of 10.4%.

    更新日期:2018-07-12
  • Photocatalytic conversion of gas phase carbon dioxide by graphitic carbon nitride decorated with cuprous oxide with various morphologies
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-19
    Po-Ya Chang, I-Hsiang Tseng

    Submicron cuprous oxide (Cu2O) crystals with various morphologies were successfully fabricated and incorporated with graphitic carbon nitride (gCN) to evaluate their activity for gas phase CO2 photoreduction under visible-light illumination. Both the morphology of Cu2O and the composition of copper species were tunable and were significantly affected by the presence of gCN. The morphology of Cu2O influenced the band structure and optical property, as well as the efficiency of photo-induced charge transfer within each sample. The compositions of Cu2O_gCN before and after illumination were compared to evaluate the photostability of samples. In addition to the majority of Cu2O crystals, other copper species, CuO or metallic Cu, were presented and considered as the assistance for CO2 adsorption or interfacial charge transfer. Improved conversion of CO2 to CO was achieved by combining n-type gCN and p-type Cu2O crystals with an optimum surface composition, and by selecting the Cu2O crystals with higher photostability.

    更新日期:2018-07-12
  • Applicability of nonionic surfactant alkyl polyglucoside in preparation of liquid CO2 emulsion
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-18
    Hui-Bo Qin, Xiao-Chao Sun, Chang-Yu Sun, Guang-Jin Chen, Zheng-Fu Ning, Ke-Le Yan, Lan-Ying Yang

    The essential characteristic of CO2 makes most surfactants futile to form stable CO2 emulsion. In this work, a green surfactant named alkyl polyglucoside (APG) was applied to prepare liquid CO2 emulsion. The performance of surfactant on CO2 emulsion stability was assessed in a sapphire cell by delamination time of emulsion under the operating conditions about 284.5 K and 5.2 MPa. The results demonstrate that APG has a potential to be used in CO2 emulsion preparation and the suitable dosage of APG is about 3.0 wt% water quality. The phase-inversion point of water-in-CO2 and CO2-in-water was determined as ranging from 15 vol% to 17.5 vol% (water cut) after examining the systems at different water cuts with 3.0 wt% APG. Two surfactants, fatty alcohol polyoxyethylene ether (AEO) and sodium bis(2-ethylhexyl) sulfosuccinate (AOT) were also tested. To consider the applicability of CO2 emulsion in fields such as submarine hydrate exploitation and CO2 sequestration, the performance of surfactants in saline solution was examined. The experimental results show that APG can be used as surfactant in preparing liquid CO2 emulsion with or without NaCl. The adding of 1.0 wt% NaCl for CO2 emulsion with 3.0 wt% APG was proved to change the phase-inversion point to higher water cut. In comparison, anion surfactant AOT was futile in saline solution.

    更新日期:2018-07-12
  • Mining the intrinsic trends of CO2 solubility in blended solutions
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-18
    Hao Li, Zhien Zhang

    CO2 solubility in trisodium phosphate (TSP) and its mixed solutions is a crucial information for CO2 absorption and utilization. However, with limited experimental data and large variations of experimental conditions, intrinsic trends of CO2 solubility under a specific set of conditions are difficult to be determined without comprehensive experiments. To address this, here, a machine learning based data-mining is proven a powerful method to explore the intrinsic trends of CO2 solubility trained from 299 data groups extracted from previous experimental literatures. A generalized machine learning input representation method was applied, for the first time, by quantifying the types and concentrations of the blended solutions. With a general regression neural network (GRNN) as the algorithm, we found that the intrinsic trends of CO2 solubility could be well-fitted with a limited amount of experimental data, having the average root mean square error (RMSE) lower than 0.038 mol CO2/mol solution. More importantly, it is shown that with a generalized input representation, machine learning can mine the relationships between CO2 solubility and various experimental conditions, which could help to better understand the intrinsic trends of CO2 solubility in blended solutions.

    更新日期:2018-07-12
  • Eu-doped TiO2 nanoparticles with enhanced activity for CO2 phpotcatalytic reduction
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-17
    Chun-ying Huang, Rui-tang Guo, Wei-guo Pan, Jun-ying Tang, Wei-guo Zhou, Hao Qin, Xing-yu Liu, Peng-yao Jia
    更新日期:2018-07-12
  • Contribution of pyrolytic gas medium to the fabrication of co-impregnated biochar
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-13
    Dong-Wan Cho, Sohyun Kim, Daniel C.W. Tsang, Nanthi S. Bolan, Taejin Kim, Eilhann E. Kwon, Yong Sik Ok, Hocheol Song
    更新日期:2018-07-12
  • Effect of supports on the performance of Co-based catalysts in methane dry reforming
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-14
    Jung-Hyun Park, Suyeon Yeo, Tae-Sun Chang
    更新日期:2018-07-12
  • Microalgae: Potential precursors of CO2 adsorbents
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-14
    I. Durán, F. Rubiera, C. Pevida

    With faster growth rates and higher photosynthetic efficiencies than other terrestrial plants, microalgae biomass could be considered as a green, low-cost, alternative carbon source. This paper explores the potential use of various species of microalgae as activated carbon precursors. Chlorella and Spirulina were evaluated both as freeze-dried microalgae and in fresh paste form, while Acutodesmus Obliquus and Coelastrella sp. were studied only as paste. Activated carbons were produced using the selected species of microalgae as well as mixtures of pine sawdust and microalgae. Two different preparation routes were compared: with and without hydrothermal carbonization pretreatment before physical activation with CO2 in a single step. All samples were conformed into pellets prior to CO2 activation. The CO2 adsorption capacity of the microalgae derived carbons was assessed in conditions representative of a flue gas (10.5 vol.% CO2 at atmospheric pressure and 50 °C). Significant differences in terms of CO2 adsorption capacity, carbon yield and pellet density were obtained among the species studied. These preliminary results showed that activated carbons produced from microalgae mixed with pine sawdust and directly activated with CO2 are among the most promising adsorbents to capture CO2 from flue gas.

    更新日期:2018-07-12
  • 更新日期:2018-07-12
  • Effect of pressure and time on scCO2-assisted incorporation of thymol into LDPE-based nanocomposites for active food packaging
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-06
    Adrián Rojas, Alejandra Torres, Alejandro Añazco, Carolina Villegas, María José Galotto, Abel Guarda, Julio Romero
    更新日期:2018-07-12
  • 更新日期:2018-07-12
  • Halotolerant carbonic anhydrase with unusual N-terminal extension from marine Hydrogenovibrio marinus as novel biocatalyst for carbon sequestration under high-salt environments
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-05
    Byung Hoon Jo, Seul-Ki Im, Hyung Joon Cha

    Carbonic anhydrase (CA), an enzyme that catalyzes the carbon dioxide (CO2) hydration, has been suggested as a potentially powerful agent for CO2 capture and utilization. For successful application, CA should withstand the harsh environment presented by CO2-capturing facilities. While there have been intensive efforts to identify and engineer thermostable CAs, other required conditions such as the high salt concentration of CO2 absorbents have often been ignored. Herein, we expressed, purified, and characterized a novel α-type CA (hmCA) possessing an unusual N-terminal extension from the halophilic marine bacterium Hydrogenovibrio marinus. We found that the N-terminal extension strongly influenced the enzyme solubility. Recombinant hmCA showed catalytic efficiency comparable to other bacterial α-type CAs. hmCA was less inhibited by anionic inhibitors showing 1.6- (NO3−), 3.1- (NO2−), and 3.7-fold (Cl−) higher inhibition constants than those of mesophilic bovine CA (bCA), suggesting halotolerance. Recombinant hmCA was markedly stabilized using most of the alkali metal salts tested, showing 19 °C higher melting temperature at 1 M NaCl compared to bCA that was significantly destabilized. The region of N-terminal extension seemed not to be involved in halotolerance. The remarkable halotolerance may be attributed to the uneven distribution of electrostatic potential and the localized negative charge on the hmCA surface. hmCA displayed ∼29-fold longer half-life than that of bCA at 40 °C in potassium carbonate as a practical absorbent, suggesting that halotolerance should be considered another key characteristic in the development of biocatalysts for CO2 capture using high-salt-containing CO2 absorbents.

    更新日期:2018-07-12
  • Electrochemical CO2 reduction to formate on Tin cathode: Influence of anode materials
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-05
    Hao Jiang, Yuemin Zhao, Lizhang Wang, Ying Kong, Fei Li, Peng Li

    In this work, electrochemical CO2 reduction to formate on Tin cathode coupled with Pt, IrO2-Ta2O5/Ti and β-PbO2/Ti anodes was investigated by electrochemical tests and lab-scale experiments. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) patterns of the prepared anodes demonstrate the layers doped on Ti plates exist in tetragonal phase of IrO2 and β-PbO2 crystals with dendritic and pyramid shapes, respectively, benefiting to increasing anode area in water electrolysis. The electrochemical measurements including cyclic voltammetry (CV), polarization curve and electrochemical impedance spectroscopy (EIS) performed in Na2SO4 solution indicate the IrO2-Ta2O5/Ti anode possesses higher oxygen evolution activity compared with those of Pt and β-PbO2/Ti ones; this is because of its excellent abilities in enlarging electrode area, decreasing oxygen evolution potential (OEP) and increasing oxidation kinetics for water decomposition, which effectively enhances the CO2 reduction. The faradic and energy efficiencies of IrO2-Ta2O5/Ti anode are 40.2% and 27.4%, raising by ratios of 7.2%, 81.1% and 12.8%, 242.5% to those of Pt and β-PbO2/Ti, respectively, at applied current of 0.3 A and reaction time of 24 h during formate production. Moreover, the power consumption lowered to 13.0 kW h/kg formate on IrO2-Ta2O5/Ti anode was achieved and it is much less than those on other two anodes, offsetting about 53.8% of the input energy if prices of the formate and electricity are overall taken into account. Therefore, anode materials highly affect the reductive kinetics and employment of anodes with lower OEP is a cost-effective strategy for electrochemical CO2 reduction.

    更新日期:2018-07-12
  • Amine-based CO2 capture sorbents: A potential CO2 hydrogenation catalyst
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-06-05
    Srikanth Chakravartula Srivatsa, Sankar Bhattacharya
    更新日期:2018-07-12
  • Thermodynamic analysis on carbon dioxide capture by Electric Swing Adsorption (ESA) technology
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-31
    Ruikai Zhao, Longcheng Liu, Li Zhao, Shuai Deng, Hailong Li
    更新日期:2018-07-12
  • Sustainable packaging waste-derived activated carbon for carbon dioxide capture
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-30
    Mohanad Idrees, Vijaya Rangari, Shaik Jeelani
    更新日期:2018-07-12
  • 更新日期:2018-07-12
  • Fucoxanthin-rich oil encapsulation using biodegradable polyethylene glycol and particles from gas-saturated solutions technique
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-29
    Dinh Tri Vo, Periaswamy Sivagnanam Saravana, Hee-Chul Woo, Byung-Soo Chun
    更新日期:2018-07-12
  • Insight towards the role of ceria-based supports for reverse water gas shift reaction over RuFe nanoparticles
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-28
    Christopher Panaritis, Mahesh Edake, Martin Couillard, Raha Einakchi, Elena A. Baranova
    更新日期:2018-07-12
  • Thermodynamic modelling of carbon dioxide solubility in aqueous amino acid salt solutions and their blends with alkanolamines
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-27
    Humbul Suleman, Abdulhalim Shah Maulud, Afaf Syalsabila

    In this study, two thermodynamic approaches, namely explicit model and modified Kent-Eisenberg model are presented for the accurate determination of carbon dioxide solubility in aqueous solutions of amino acid salts with different levels of complexity. Both models were further extended to the correlation of carbon dioxide solubility in aqueous blends of amino acid salts with alkanolamines. Firstly, the explicit model consists of a single mathematical equation. Its structure is computationally simple and derived from equilibrium thermodynamics theory. Secondly, the modified Kent-Eisenberg model utilizes detailed reaction mechanism for development of a polynomial equation, that is solved by combining all non-idealities in two correction factors. Both models suitably determined the thermodynamics of carbon dioxide loaded aqueous amino acid salt solutions and their blends with alkanolamines. The results were in good agreement with experimental data for representative amino acid salt solutions (potassium and/or sodium salts of lysine, glycine, proline, sarcosine, serine, threonine, alanine, phenylalanine, amino-butyric acid, glutamine and asparagine) and their blends with alkanolamines (2-amino-2-methyl-1-propanol and piperazine) for range of process parameters. For carbon dioxide solubility in aqueous amino acid salt solutions, the AARE% for explicit and modified Kent-Eisenberg model was 13.85% and 13.84%, respectively. For carbon dioxide solubility in aqueous blends of amino acid salt and alkanolamine solutions, the AARE% for explicit and modified Kent-Eisenberg model was 18.25% and 17.25%, respectively. Both models use a small number of adjustable parameters. This indicates that generated parameters are able to accurately predict the carbon dioxide solubility at other process conditions, with minimum computational intricacy.

    更新日期:2018-07-12
  • Advances in CO₂ utilization technology: A patent landscape review
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-30
    R.S. Norhasyima, T.M.I. Mahlia

    There is rising concern on the increasing trend of global warming due to anthropogenic CO₂ emission which steers progress of carbon capture and storage (CCS) projects worldwide. However, due to high cost and uncertainties in long term geological storage, there is a growing inclination to include utilization, which re-use the CO2, hence carbon capture utilization and storage (CCUS). Additionally, it is expected to generate income to offset the initial costs. This study methodically review patents on CO₂ utilization technologies for CCUS application published between year 1980–2017. It was conducted using the Derwent Innovation patent database and more than 3000 number of patents was identified. The patents identified are in the field of enhanced oil recovery (EOR) and enhanced coal-bed methane (ECBM), chemical and fuel, mineral carbonation, biological algae cultivation and enhanced geothermal system (EGS). Over 60% of these patents were published since the last 10 years, and a sharp increase in patents were seen in the last 5 years (∼38%). The top major patent types are patents granted in the United States (US), China (CN) and Canada (CA) which makes of 3/5 of the overall patent type found. Recent patents published include enhancements to the state-of-the-art technologies and hybrid concepts such as in photo-bioreactor in algae cultivation, chemical reaction and EGS. From this study, it was found that further research for the best CO₂ utilization method which fulfil the need of an economic, safe, non-location dependent and environmentally friendly whilst efficiently mitigate the worldwide global warming issue is much needed.

    更新日期:2018-07-12
  • Recent applications of polyoxometalates in CO2 capture and transformation
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-26
    Bing Yu, Bo Zou, Chang-Wen Hu
    更新日期:2018-07-12
  • Critical transition of epoxy resin from brittleness to toughness by incorporating CO2-sourced cyclic carbonate
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    Jiexi Ke, Xiaoyun Li, Shuai Jiang, Junwei Wang, Maoqing Kang, Qifeng Li, Yuhua Zhao
    更新日期:2018-07-12
  • Charge controlled switchable CO2/N2 separation for g-C10N9 membrane: Insights from molecular dynamics simulations
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    Xiao Chang, Lei Zhu, Qingzhong Xue, Xiao Li, Tianchao Guo, Xiaofang Li, Ming Ma
    更新日期:2018-07-12
  • Metal incorporated biochar as a potential adsorbent for high capacity CO2 capture at ambient condition
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    Pooya Lahijani, Maedeh Mohammadi, Abdul Rahman Mohamed
    更新日期:2018-07-12
  • Thermodynamic analysis of the CO2 methanation reaction with in situ water removal for biogas upgrading
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    A. Catarina Faria, C.V. Miguel, Luís M. Madeira
    更新日期:2018-07-12
  • A new chemical structure-based model to estimate solid compound solubility in supercritical CO2
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    Alireza Baghban, Jafar Sasanipour, Zhien Zhang

    Utilization of new approaches in the determination of drug solubility in supercritical fluids can reduce the computation time and represent reliable results. This also leads to more applications of the supercritical technology in the field of drug manufacturing. A least-square support vector machine (LSSVM) approach is employed in this study in order to predict 33 different drug solubility in supercritical CO2. The solubility of the drugs is estimated as a function of temperature, pressure, supercritical CO2 density, and 20 different chemical substructures. LSSVM results are then compared to those obtained from 8 previously reported semi-empirical correlations. Satisfying predictions are performed by the proposed LSSVM with an average absolute relative deviation of 4.92% and determination coefficient of 0.998 for the testing dataset. Therefore, the proposed LSSVM can be applied as a reliable predictive tool to estimate the drugs’ solubility, if drugs’ chemical structures are given.

    更新日期:2018-07-12
  • Carbon dioxide assisted toluene side-chain alkylation with methanol over Cs-X zeolite catalyst
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-19
    Dong-Woo Seo, Sheikh Tareq Rahma, Benjaram M. Reddy, Sang-Eon Park

    Zeolite Cs-X is an acknowledged representative basic catalyst useful for side-chain alkylation of toluene with methanol. In spite of numerous investigations, still there has been long lasting challenge for achieving high selectivity for side-chain alkylated products rather than ring alkylated products. In an effort to improve the yields of side-chain alkylated products, CO2 was introduced during the toluene side-chain alkylation with methanol at 425 °C over Cs loaded faujasite catalyst. The CO2 addition facilitated in removing the formed hydrogen by reverse water-gas shift reaction and enhanced the product yield. Interestingly, CO2 addition helped in obtaining higher yields of side-chain alkylation products including styrene/ethylbenzene and α-methylstyrene/iso-propylbenzene. The CO2 introduction resulted in less H2 formation in the product stream during the reaction. Mesoporosity was also introduced to the zeolite X to improve the activity and product selectivity.

    更新日期:2018-07-12
  • 更新日期:2018-07-12
  • Use CO2-Triggered switchable water additive to reversibly emulsify and demulsify diesel
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-17
    Shuai Wang, Dongfang Liu, Jihe Zhao, Xiaojiang Li, Daixue Xu, Yuan Gu, Hongsheng Lu

    In this paper, a practical and environmental friendly method was successfully developed by using CO2-Triggered switchable water additive to reversibly emulsify and demulsify diesel, aims to provide guidance for recovering oil substances in waste oil-based drill cuttings. In this new method, N, N, N', N'-tetramethyl-1, 6-hexanediamine(TMHDA) was a switchable water additive whose aqueous solution can switch the ionic strength by addition and removal CO2. Then it can be used to separate diesel through reversibly emulsification and demulsification. The nuclear magnetic resonance hydrogen spectrum (1H NMR) and conductivity demonstrated TMHDA have better switching performance. Then, diesel/naphthenic acid mixtures have been used for modeling the application of recovering oil substances in waste oil-based drill cuttings. When the acid value≥1.76mgKOH/g (the oil and TMHDA solution were 5 mL), diesel can be emulsified. The material produced by TMHDA and naphthenic acid have a strong surface activity so that the oil/water interfacial tension was less than 0.1 mN·m−1. The demulsification performance was illustrated by change of the ionic strength, pH and the content of oil in the aqueous phase during the breaking process. Brief provided two optimization strategies of recycling of TMHDA additive. Finally, the possible mechanism of the new method was discussed.

    更新日期:2018-07-12
  • Study on mineral carbonation of heat activated lizardite at pilot and laboratory scale
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    Emad Benhelal, Muhammad Imran Rashid, Mark S. Rayson, Jan-Dirk Prigge, Scott Molloy, Geoff F. Brent, Annie Cote, Michael Stockenhuber, Eric M. Kennedy

    This investigation examines the experimental data obtained from a 30 L pilot batch reactor, used for single stage aqueous carbonation and for the dissolution of heat activated lizardite and compares this data to the laboratory scale data obtained under similar reaction conditions. Two mineral feeds, heat activated lizardite produced in large quantities in a gas fired industrial kiln (“P.H.A”) and heat activated lizardite sample synthesised in a laboratory kiln (“L.H.A”) were characterised and their reactivity was compared. Characterisation of the two heat activated samples showed that the P.H.A material contained relatively high concentrations of crystalline phases and a lower proportion of amorphous magnesium silicate, as well as a higher average particle size compared to L.H.A. These properties resulted in a reduction in magnesite yield and extent of magnesium extraction when P.H.A samples were used for carbonation and dissolution experiments, compared to the results obtained with L.H.A. as feed. The results of aqueous carbonation experiments in the pilot and the laboratory scale reactors using P.H.A exhibited less than 5% variation in repeat experiments. Results indicate that the magnesite yield obtained in the pilot batch reactor was 35 ± 2% higher than that produced in the laboratory scale reactor. The higher yield was attributed to improved mixing in the pilot batch reactor compared to the laboratory scale reactor and consequent removal of the precipitated phases on the surface of heat activated particles in the pilot reactor. The yield of magnesite in mineral carbonation experiments using demineralised water and tap water was almost identical. Undertaking reaction in 1 M NaCl solution did not have a significant effect, but adding 0.64 M sodium bicarbonate had a notable effect on magnesite yield. Low pressure, low temperature dissolution experiments using L.H.A sample displayed similar rates of magnesium extraction in the pilot and the laboratory scale reactors.

    更新日期:2018-07-12
  • CO2 hydrogenation to methane over mesoporous Co/SiO2 catalysts: Effect of structure
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-16
    Guilin Zhou, Huiran Liu, Yingzhi Xing, Shiyu Xu, Hongmei Xie, Kun Xiong

    The mesoporous Co/SiO2 catalysts with 10 wt.% Co loading were prepared by grind-impregnation method for CO2 hydrogenation, and the mesoporous SiO2 materials with different structures were used as the supports. The physicochemical properties of the Co/SiO2 catalysts were characterized by TEM, BET, H2-TPR, XRD, and CO2-TPD. The results indicate that the pore size, specific surface area, and the Co° species crystallinity of the Co/SiO2 catalyst increase with increasing crystallization temperature of preparing SiO2 support. The Co/SiO2 catalyst has the best CO2 adsorption property when SiO2 support is prepared at the crystallization temperature of 100 °C. The CO2 reaction rate (CO2 conversion) of the Co/SiO2 catalysts is as follows: CK100 > CK080 > CK120 > CK060 > CK140 > CK040, and the CH4 selectivity follows the order: CK100 > CK080 > CK120 > CK140 > CK060 > CK040, accompanied by a certain amount of by-product CO molecules. At 360 °C, the CO2 reaction rate (CO2 conversion) of the CK100 catalyst is up to 3.29 × 10−5 mol/gcat/s (44.3%), the CH4 and CO selectivity are 86.5% and 13.5%, respectively.

    更新日期:2018-07-12
  • 更新日期:2018-07-12
  • DBD plasma-assisted CO2 methanation using zeolite-based catalysts: Structure composition-reactivity approach and effect of Ce as promoter
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-25
    M.C. Bacariza, M. Biset-Peiró, I. Graça, J. Guilera, J. Morante, J.M. Lopes, T. Andreu, C. Henriques
    更新日期:2018-07-12
  • Stress state and stress path evaluation to address uncertainties in reservoir rock failure in CO2 sequestration in deep saline aquifers: An experimental study of the Hawkesbury sandstone formation
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-13
    T.D. Rathnaweera, P.G. Ranjith, M.S.A. Perera, W.A.M. Wanniarachchi, K.M.A.S. Bandara

    Injecting CO2 into aquifer pore fluid (high salinity brine) in deep saline aquifers during the sequestration process causes the chemico-mineral structure to be altered through complex chemically-coupled mechanical deformations. This is as yet poorly understood in the field. The authors conducted a series of tri-axial strength tests on Hawkesbury sandstone under in-situ stress and temperature conditions to characterise the behaviour of reservoir rock upon exposure to super-critical CO2 (ScCO2) to determine this chemically-coupled mechanical behaviour. According to the findings, injection of CO2 into a brine-saturated reservoir rock mass may cause a considerable strength reduction, probably due to the rock’s mineralogical alteration-induced mechanical weakening of grain contacts. This was confirmed by SEM analysis, according to which the mineral dissolution process upon exposure to ScCO2 is significant, and considerable quartz and calcite dissolution were noticed in the tested samples. Importantly, this rock mineral dissolution may alter the reservoir’s natural pore geometry. This eventually affects the effective stress patterns acting on the rock matrix. In addition, the slip tendency of brine+CO2-reacted reservoir rock is increased with increasing injection pressure, revealing the fate of the resulting pore pressure-dominant effective stress field through the CO2 injection process. The results were then incorporated in the effective stress field model. This model can be used to predict the possibility of mechanical failure of reservoir rock upon CO2 injection into saline aquifers.

    更新日期:2018-07-12
  • Electrochemical conversion of CO2 over microchanneled cathode supports of solid oxide electrolysis cells
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-12
    Libo Yu, Jingjing Wang, Zhengmao Ye, Xun Hu, C.E. Buckley, George E. Marnellos, Dehua Dong
    更新日期:2018-07-12
  • Assessment of the intrinsic interactions of nanocomposite polyaniline/SBA-15 with carbon dioxide: Correlation between the hydrophilic character and surface basicity
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-11
    Bouhadjar Boukoussa, Aboubakr Hakiki, Ana Paola Nunes-Beltrao, Rachida Hamacha, Abdelkrim Azzouz
    更新日期:2018-07-12
  • Facet effect on CO2 adsorption, dissociation and hydrogenation over Fe catalysts: Insight from DFT
    J. CO2 UTIL. (IF 5.503) Pub Date : 2018-05-10
    Haozhi Wang, Xiaowa Nie, Yonggang Chen, Xinwen Guo, Chunshan Song
    更新日期:2018-07-12
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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