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  • Development of a powerful CO2 methanation process using a structured Ni/CeO2 catalyst
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-12
    Sakhon Ratchahat, Masao Sudoh, Yuji Suzuki, Wataru Kawasaki, Ryo Watanabe, Choji Fukuhara
    更新日期:2018-01-13
  • Supercritical carbon dioxide extraction of Melaleuca cajuputi leaves for herbicides allelopathy: Optimization and kinetics modelling
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-12
    Benjamin Wei Bin Kueh, Suzana Yusup, Noridah Osman

    Due to the rice production problem, control of paddy weeds with the use of allelopathy as active compounds serve as new alternative for sustainable weeds management. The volatile oil from Melaleuca cajuputi which has possible active allelopathy compound present is extracted and analyzed. Response Surface Methodology (RSM) with central composite rotatable design (CCRD) is used to design the experiment for optimization of supercritical carbon dioxide (SC-CO2) extraction of volatile oil from Melaleuca cajuputi leaves for maximum oil yield. Three factors which included carbon dioxide (CO2) flow rate (4–7 ml/min), temperature (40–55 ℃ ℃ ) and pressure (14–26 MPa) were investigated. The regression model shows a good prediction with coefficient of determination, R2 of 0.9607. The optimum condition of SC-CO2 extraction is determined to be at CO2 flow rate of 5.88 ml/min, temperature of 43.10℃ ℃ and pressure of 24.91 MPa with the prediction yield of 1.24 wt%. The optimum condition is validated with experimental runs which gives an average yield of 1.26 wt% which indicates good agreement between the measured and predicted value. The chemical composition of the volatile oil at optimized condition is analyzed using Gas Chromatography Mass Spectrometry (GC–MS) and Gas Chromatography with Flame Ionization Detector (GC-FID). Caryophyllene and humulene are the two major sesquiterpenes detected from the optimized condition. Thus, volatile oil extract from the foliage of Melaleuca cajuputi can be considered as potential source for bio-herbicides due to the presence of caryophyllene which has allelopathic effect. Kinetics studies are also studied with modified Reverchon-Sesti Osseo as the model fitting.

    更新日期:2018-01-13
  • Active and stable hydrotalcite derived Ni catalysts for CO2 reforming of methane: Comparison with catalysts by incipient wetness
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-12
    Dori Yosef Kalai, Kristian Stangeland, Yiying Jin, Zhixin Yu
    更新日期:2018-01-13
  • A novel application of α- and β-sodium ferrite as a CO2-capturing solid in air with water vapor
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-11
    Ikuo Yanase, Shuhei Onozawa, Kouhei Ogasawara, Hidehiko Kobayashi
    更新日期:2018-01-12
  • Facile one-pot synthesis of Ni@HSS as a novel yolk-shell structure catalyst for dry reforming of methane
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-10
    Yao Lu, Dan Guo, Yongzhe Ruan, Yujun Zhao, Shengping Wang, Xinbin Ma
    更新日期:2018-01-11
  • Conversion of carbon dioxide into cyclic carbonates using wool powder-KI as catalyst
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-06
    Haibo Chang, Qingshuo Li, Xuemin Cui, Hongxia Wang, Zhanwei Bu, Congzhen Qiao, Tong Lin
    更新日期:2018-01-07
  • Alcohol promoted methanol synthesis enhanced by adsorption of water and dual catalysts
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-06
    Harri Nieminen, Georgy Givirovskiy, Arto Laari, Tuomas Koiranen
    更新日期:2018-01-07
  • CO2 sequestration by pH-swing mineral carbonation based on HCl/NH4OH system using iron-rich lizardite 1T
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-05
    Gretta Larisa Aurora Arce Ferrufino, Sayuri Okamoto, Jose Carlos Dos Santos, João Andrade de Carvalho Jr., I. Avila, Carlos Manuel Romero Luna, Turibio Gomes Soares Neto

    In pH-swing mineral carbonation, several acid/base systems has been investigated. Currently the main acid/base systems employed are HCl/NaOH and NH4HSO4/NH4OH. However, the use of a HCl/NH4OH system was not yet elucidated. This study proposes to evaluate the feasibility of a pH-swing mineral carbonation based on HCl/NH4OH system at atmospheric pressure and moderate temperatures using mining waste from asbestos production from Goiás State, Brazil (S-GO) for two conditions (i.e. stoichiometric conditions (T2E) and acid excess (T2)). Results indicated that the Fe3+ content in S-GO acted as a catalyst, due to FeCl3 hydrolysis in aqueous solutions. Thus, high Mg and Fe extraction efficiency (95 ± 2%), were achieved in the leaching stage for both conditions. The S1 solid residue was mainly SiO2 with 90 ± 1% purity content. In the purification stage 91.7 ± 1.9% of Fet were removed, however, a loss of Mg of 13.6 ± 2.3% was also detected. On the carbonation stage, high purity hydromagnesite was formed in T2E; this stage had a 85% efficiency, thus, 36.7% of CO2 was fixed. On T2, excess H2O and CO2 promoted dypingite formation and reduced hydromagnesite formation. After carbonation, the formation of crystals was observed in the NH4Cl aqueous solution at 25 °C, indicating NH4Cl supersaturation. The results of mass balance indicate that 4 ton of mineral waste will be employed for each ton of captured CO2, as well as 2.6 ton of HCl, and 4.5 ton of NH4OH. However, 1.7 ton of SiO2, 0.55 ton of iron oxides, and 2.7 ton of hydromagnesite could be produced.

    更新日期:2018-01-06
  • The effect of pore size dimensions in isoreticular zeolites on carbon dioxide adsorption heats
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-04
    Arnošt Zukal, Mariya Shamzhy, Martin Kubů, Jiří Čejka
    更新日期:2018-01-04
  • Determining the volume expansion of the CO2 + octane mixture using a fused silica capillary cell with in-situ Raman spectroscopy
    J. CO2 UTIL. (IF 4.292) Pub Date : 2018-01-02
    Ke Bei, Junliang Wang, Shuyan Zhou, Guangna Xie, Yanmei Xu, Liang Wang, Zhuoran Jiang, I-Ming Chou, Zhiyan Pan
    更新日期:2018-01-03
  • DFT insight into the support effect on the adsorption and activation of key species over Co catalysts for CO2 methanation
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-26
    Xiaowa Nie, Haozhi Wang, Wenhui Li, Yonggang Chen, Xinwen Guo, Chunshan Song
    更新日期:2017-12-31
  • Mesocellular silica foam-based Ni catalysts for dry reforming of CH4 (by CO2)
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-29
    Oscar Daoura, Marie-Nour Kaydouh, Nissrine El-Hassan, Pascale Massiani, Franck Launay, Maya Boutros
    更新日期:2017-12-31
  • Silver-catalyzed regioselective coupling of carbon dioxide, amines and aryloxyallenes leading to O-allyl carbamates
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-29
    Chaorong Qi, Donghao Yan, Wenfang Xiong, Huanfeng Jiang
    更新日期:2017-12-31
  • CeO2 Promoted Ni-MgO-Al2O3 nanocatalysts for carbon dioxide reforming of methane
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-30
    Ehsan Akbari, Seyed Mehdi Alavi, Mehran Rezaei
    更新日期:2017-12-31
  • Utilization of alumina-supported K2CO3 as CO2-selective sorbent: A promising strategy to mitigate the carbon footprint of the maritime sector
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-30
    Alessandro Erto, Marco Balsamo, Liana Pasqualina Paduano, Amedeo Lancia, Francesco Di Natale

    This paper investigates the application of K2CO3 supported onto porous alumina, as sorbent for selective CO2 capture in marine applications. Alumina-functionalized sorbents were prepared by incipient wetness impregnation achieving K2CO3 loadings from 3.6 to 14.1% wt. Carbonation tests were performed in a fixed-bed column at temperatures between 60 and 105 °C, as those typically occurring at the outlet of a scrubber and/or a waste heat recovery unit, with a model diesel engine exhaust (5% vol. CO2, 5% vol. H2O, balance N2). According to the carbonate loading, the sorbents may reach conversion degrees of carbonate up to 90% and overall capture capacity up to 0.66 mol kg−1 sorbent. Experimental data showed higher conversion degree and capture capacity compared with unsupported K2CO3, which is affected by significant intraparticle diffusion limitations. Steam regeneration tests performed in a fixed-bed column on the sorbent with 3.6% wt K2CO3 loading revealed that a temperature of 120 °C assures almost complete recovery of captured CO2 while preserving the sorbent carbonation degree for 10 consecutive carbonation/regeneration cycles. The preliminary design of a temperature swing carbonation/regeneration unit for on-board ship installation was performed for the reference case study of a passenger ship equipped with a 4.35 MW marine engine fueled with marine gas oil and with a commercial seawater scrubber for SO2 removal. The proposed unit appeared able to cut up to 30% carbon dioxide emission by using the sorbent containing 3.6% wt K2CO3 and operating the carbonation and regeneration stage at 60 and 120 °C, respectively.

    更新日期:2017-12-31
  • Preparation and stability of dexamethasone-loaded polymeric scaffolds for bone regeneration processed by compressed CO2 foaming ☆
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-26
    Leticia Goimil, Philip Jaeger, Inés Ardao, José Luis Gómez-Amoza, Angel Concheiro, Carmen Alvarez-Lorenzo, Carlos A. García-González
    更新日期:2017-12-27
  • Hydrotalcite/SBA15 composites for pre-combustion CO2 capture: CO2 adsorption characteristics
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-15
    Jiaxi Peng, Diana Iruretagoyena, David Chadwick
    更新日期:2017-12-18
  • Photoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-16
    Juliana Ferreira de Brito, Felipe Fantinato Hudari, Maria Valnice Boldrin Zanoni
    更新日期:2017-12-18
  • Elucidating the accelerated carbonation products of calcium silicates using multi-technique approach
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-18
    Warda Ashraf, Jan Olek

    This article features an investigation of the accelerated carbonation products of four calcium silicate phases, namely monoclinic-tricalcium silicate (3CaO·SiO2 or C3S), γ-dicalcium silicate (2CaO·SiO2 or γ-C2S), tricalcium disilicate (3CaO·2SiO2 or C3S2, rankinite), and monocalcium silicate (CaO·SiO2 or CS, wollastonite). During the carbonation reaction, the calcium silicate minerals form calcium carbonate and Ca-modified silica gel. These reaction products were examined using thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), 29Si magic angle spining (MAS) nuclear magnetic resonance (NMR), 13C {1H} cross polarized (CP)/MAS NMR, and dynamic vapor sorption (DVS) techniques. Along with the crystalline forms of CaCO3 (i.e., calcite, vaterite, and aragonite), amorphous calcium carbonate (ACC) was also found to be present in the carbonated calcium silicate systems. Based on the experimental results, it is proposed that the ACC particles were stabilized by the deposition of silica layers on their surfaces. Presence of ACC also affected the pore size distribution of the matrixes, which eventually influenced the diffusion based carbonation rate of the matrixes. Moreover, the degree of carbonation of CS was found to be most effective compared to other calcium silicates in terms of the percentage of the phase reacted for the experimental conditions used in this study.

    更新日期:2017-12-18
  • Simulation and optimization of reforming reactors for carbon dioxide utilization using both rigorous and reduced models
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-18
    Priyadarshini Balasubramanian, Ishan Bajaj, M.M. Faruque Hasan

    CO2 is a major greenhouse gas emitted at the global scale from burning fossil fuels. Converting CO2 to chemicals such as syngas is a promising way to reduce CO2 emissions from stationary sources. In this work, we explore technologies for the thermochemical conversion of CO2 to syngas using both rigorous and reduced order reactor models. Specifically, we study the CO2 utilization potentials of primary reforming such as dry reforming (DR), steam methane reforming (SMR) and partial oxidation (POX), and combined reforming such as combined dry and steam methane reforming (CDSMR), auto-thermal reforming (ATR), combined partial oxidation and dry reforming (PODR) and tri-reforming (TR). Through detailed simulation and analysis, we show the importance of considering rigorous models for accurate prediction. We also develop algebraic surrogate models for reactor outlets as functions of reactor design and operating conditions. The replacement of the high-fidelity models with their simpler algebraic surrogates provides an efficient way for superstructure-based reactor synthesis. Using a mixed-integer nonlinear optimization (MINLP)-based reactor synthesis model, the reactors are further optimized for maximizing CO2 utilization and syngas selectivity. PODR has been found to have the highest potential for converting CO2 for the range of syngas ratios (H2/CO) between 1 and 1.7, achieving almost 100% CO2 conversion with a syngas selectivity ranging 80–93%. We further improve the conversion and syngas selectivity by distributing the feeds to multiple reformers. A combination of DR, CDSMR and TR achieves the best CO2 conversion for syngas ratios up to 2.4. For higher syngas ratios, a combination of SMR, TR and RWGS are found to be optimal. These are non-intuitive results that need further attention.

    更新日期:2017-12-18
  • Syngas production in chemical looping reforming process over ZrO2 promoted Mn-based catalyst
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-18
    I. Alirezaei, A. Hafizi, M.R. Rahimpour

    Chemical looping reforming (CLR) of methane is a familiar process for the production syngas or hydrogen, which could be applied as one of the most important energy sources. In this process, reforming of methane takes place in the fuel reactor in contact with lattice oxygen of oxygen carriers (OCs), while the reduced OCs are re-oxidized in the air reactor. In this study, two different alumina supports are promoted using zirconium oxide to improve Mn-based oxygen carriers. Different synthesized oxygen carriers were evaluated in CO2-modified chemical looping reforming process at different conditions such as reaction temperature (500–750 °C), CH4/CO2 ratio (0.5–3), alumina support base, ZrO2 position and manganese loading weight percentage (10–30). The presence of ZrO2 in the support structure significantly inhibited the deposition of coke on the surface of oxygen carrier. The characterization and process results revealed the noteworthy effect of Zr incorporation to the structure of alumina support. The redox results revealed that 20Mn/20Zr-Al oxygen carrier exhibited the highest activity even at low reduction temperatures. This oxygen carrier exposed the highest activity and stability with lowest coke deposition during 16 redox cycles at 650 °C. The methane and CO2 conversion, H2 yield and H2/CO molar ratio of about 99.0%, 96.6%, 65.2% and 2.55 were achieved at 650 °C using the optimized oxygen carrier. The synthesized samples were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and N2 adsorption–desorption (BET) techniques.

    更新日期:2017-12-18
  • Closing carbon cycles: Evaluating the performance of multi-product CO2 utilisation and storage configurations in a refinery
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-18
    Cora Fernández-Dacosta, Viktorija Stojcheva, Andrea Ramirez

    Carbon capture and utilisation (CCU) has the potential to provide business cases as CO2 waste streams are turned into feedstock for the synthesis of marketable products. Although CCU could reduce fossil resource demand, its capability as a climate change mitigation option is under debate. In contrast to single-product CCU, this prospective study explores the techno-economic and environmental feasibility of novel systems that include more than one CO2 utilisation product. The combination of multi-product CCU with CO2 storage is also investigated. Two configurations have been designed, in which CO2 is captured in a refinery and converted into dimethyl ether (DME) and polyols, simultaneously (parallel configuration) or in two consecutive cycles (cascade configuration). Compared to a reference system without capture, results show that the largest direct CO2 emission reductions are achieved with CCS without utilisation (−70%) but at the expenses of higher total costs (+7%). Multi-product CCU systems show lower fossil depletion and costs than the reference without capture (−10% and −9%, respectively) because of feedstock replacement by the CO2 utilised. Combination of multi-product CCU with storage turns to be the best alternative for reduced climate change potential (−18% relative to the reference) while still been economically feasible. In addition to lower upstream emissions due to fossil feedstock replacement by utilising CO2, process direct emissions diminish owing to storage. No significant differences were found between the cascade and the parallel configurations. The extra effort to recycle CO2 in the cascade configurations is neither penalised nor rewarded.

    更新日期:2017-12-18
  • Efficient solvent-free fixation of CO2 catalyzed by new recyclable bifunctional metal complexes
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-06
    Jing Peng, Hai-Jian Yang, Sheng Wang, Binru Ban, Zidong Wei, Bo Lei, Cun-Yue Guo
    更新日期:2017-12-14
  • 更新日期:2017-12-14
  • Amine-modified SBA-15(P): A promising adsorbent for CO2 capture
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-11
    Guojie Zhang, Peiyu Zhao, Lanxia Hao, Ying Xu
    更新日期:2017-12-14
  • Highly selective conversion of CO2 into ethanol on Cu/ZnO/Al2O3 catalyst with the assistance of plasma
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-11
    Binran Zhao, Yajun Liu, Zijun Zhu, Huaizheng Guo, Xiaoxun Ma
    更新日期:2017-12-14
  • Study of LaxNiOy and LaxNiOy/MgAl2O4 catalysts in dry reforming of methane
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-11
    Hassiba Messaoudi, Sébastien Thomas, Abdelhamid Djaidja, Samira Slyemi, Akila Barama

    Bulk LaxNiOy and supported LaxNiOy/MgAl2O4 (with x = 1 or 2 and y = 3 or 4) catalysts have been prepared respectively by sol-gel and impregnation methods The elaborated materials have been characterized by XRD, BET, H2-TPR, H2-chemisorption and TPO. The catalytic activity was evaluated in dry reforming of methane (DMR) with an equimolar ratio of CH4 and CO2. XRD analysis shows the presence of LaNiO3, La2NiO4 and MgAl2O4 phases. Higher specific surface areas and nickel dispersions were obtained for the supported catalysts. H2-TPR analysis revealed a low reducibility of the nickel in the supported solids. Supported catalysts were found more active and stable than bulk one in DMR in good agreement with higher Ni dispersion and the beneficial role of the basic support. The XRD analysis performed on the spent catalysts (after 65 h of catalytic test) revealed the presence of the initial phases with metallic nickel species. The TPO analysis showed a low carbon deposition for the supported catalysts. A kinetic study based on the reaction mechanism points out the participation of the reverse water gas shift reaction (RWGS) for the conversion of CO2 and of the produced H2 as well as contribution of steam methane reforming reaction for the conversion of CH4, with water produced from (RWGS), for temperatures over 1023 K.

    更新日期:2017-12-14
  • Cyclocarbonated lignosulfonate as a bio-resourced reactive reinforcing agent for epoxy biocomposite: From natural waste to value-added bio-additive
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-11
    Giti Yamini, Alireza Shakeri, Mohammad Jalal Zohuriaan-Mehr, Kourosh Kabiri
    更新日期:2017-12-14
  • Evaluation of pectin-reinforced supported liquid membranes containing carbonic anhydrase: The role of ionic liquid on enzyme stability and CO2 separation performance
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-12
    Nándor Nemestóthy, Péter Bakonyi, Zsófia Németh, Katalin Bélafi-Bakó

    In this paper, pectin-reinforced, supported liquid membranes (SLMs) prepared with carbonic anhydrase (CA) were investigated for CO2/N2 separation. In the first part of the study, the effect of [Bmim][NTf2] ionic liquid (IL) – as possible solvent to fill the pores of cellulose acetate support during SLM fabrication – on enzyme activity was tested. It turned out that this particular IL caused rapid and severe loss of initial biocatalyst activity, which fact can be seen as a threat in the membrane process design. Afterwards, the stability of pectin-containing SLMs (containing CA but lacking the IL having adverse impact) was addressed and their improved resistance against higher transmembrane pressures (up to 7.2 bar) was found, representing an approx. 3-fold enhancement compared to their control. Thereafter, the performance of the membranes was tested under single and mixed gas conditions with carbon dioxide and nitrogen. Employing single gases, it was demonstrated that CA enzyme could notably increase CO2 permeability (from 55 to 93 Barrer), while that of N2 remained unchanged (1.6-1.7 Barrer). Thus, the highest CO2/N2 theoretical selectivity was attained as 54 using the pectin-reinforced SLMs enriched with CA biocatalyst. For comparison, the outcomes were plotted on the Robeson upper-bound.

    更新日期:2017-12-14
  • 更新日期:2017-12-14
  • Steady-state and controlled heating rate methanation of CO2 on Ni/MgO in a bench-scale fixed bed tubular reactor
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-13
    Georg Baldauf-Sommerbauer, Susanne Lux, Wolfgang Aniser, Brigitte Bitschnau, Ilse Letofsky-Papst, Matthäus Siebenhofer

    Chemical hydrogen storage via conversion with carbon dioxide into methane is a promising technology in an energy system that relies on renewable energy resources. Robust heterogeneous catalysts are needed for this reaction to proceed at relevant levels. Ni/MgO is a promising catalyst in terms of activity and stability. Although several microscale catalyst studies exist, there is a lack of knowledge on catalyst performance and reactor control at larger scale for carbon dioxide methanation at ambient pressure and a technically relevant stoichiometric H2:CO2 (4:1) feed. Two catalysts with a loading of 11 and 17 wt.% nickel were prepared by wet impregnation, producing a Ni/MgO solid solution with a cubic lattice. Controlled increase (‘scanning experiment’) of the catalyst temperature to 500 °C for the highly exothermic CO2 methanation was compared to steady-state experiments. Scanning and steady-state experiments yield comparable results in terms of carbon dioxide conversion and methane selectivity, whereas scanning experiments lead to considerable time saving. At a moderate temperature of 325 °C and a feed flow consisting of H2:CO2:N2 = 4:1:5 at a flow rate of 250 cm3 STPmin−1, CO2 conversion and CH4 selectivity near thermodynamic equilibrium are achievable. The long-term stability of Ni/MgO (17 wt.% Ni) at 330 °C was proven during reactor operation for several days.

    更新日期:2017-12-14
  • Effect of Zn promoter on catalytic activity and stability of Co/ZrO2 catalyst for dry reforming of CH4
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-14
    Jung-Hyun Park, Suyeon Yeo, Tae-Jin Kang, Hye-Ree Shin, Iljeong Heo, Tae-Sun Chang
    更新日期:2017-12-14
  • Use of hot supercritical CO2 produced from a geothermal reservoir to generate electric power in a gas turbine power generation system
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-20
    Edward K. Levy, Xingchao Wang, Chunjian Pan, Carlos E. Romero, Carlos Rubio Maya

    CO2 capture and sequestration in deep saline aquifers is widely considered to be a leading option for controlling greenhouse gas emissions. One such possibility involves injection of supercritical carbon dioxide into a high-permeability geothermal reservoir. In addition to the benefit of sequestering the CO2 in the reservoir, the CO2 can be used to mine geothermal heat for utilization above ground. This paper describes one of the options for generating power from hot supercritical CO2 obtained from CO2 production wells connected to a geothermal reservoir, where the original source of the CO2 is CO2 captured from fossil-fired power plants or industrial processes. The cost of power generated using CO2 produced from a geothermal reservoir with a gas turbine generation system is compared to the cost of generating power from a conventional geothermal steam power plant.

    更新日期:2017-12-14
  • Polyamine-Grafted Magadiite: High CO2 Selectivity at Capture from CO2/N2 and CO2/CH4 Mixtures
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-22
    Rômulo B. Vieira, Pedro A.S. Moura, Enrique Vilarrasa-García, Diana C.S. Azevedo, Heloise O. Pastore
    更新日期:2017-12-14
  • Synthesis of a variety of key medicinal heterocyclic compounds via chemical fixation of CO2 onto o-alkynylaniline derivatives
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-23
    Khadijeh Didehban, Esmail Vessally, Mina Salary, Ladan Edjlali, Mirzaagha Babazadeh
    更新日期:2017-12-14
  • Semimetal bismuth mediated UV–vis-IR driven photo-thermocatalysis of Bi4O5I2 for carbon dioxide to chemical energy
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-24
    Yang Bai, Ping Yang, Pingquan Wang, Haiquan Xie, Haifeng Dang, Liqun Ye
    更新日期:2017-12-14
  • 更新日期:2017-12-14
  • Clinkering-free cementation by fly ash carbonation
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-01
    Zhenhua Wei, Bu Wang, Gabriel Falzone, Erika Callagon La Plante, Monday Uchenna Okoronkwo, Zhenyu She, Tandre Oey, Magdalena Balonis, Narayanan Neithalath, Laurent Pilon, Gaurav Sant

    The production of ordinary portland cement (OPC) is a CO2 intensive process. Specifically, OPC clinkering reactions not only require substantial energy in the form of heat, but they also result in the release of CO2; i.e., from both the decarbonation of limestone and the combustion of fuel to provide heat. To create alternatives to this CO2 intensive process, this paper demonstrates a new route for clinkering-free cementation by the carbonation of fly ash; i.e., a by-product of coal combustion. It is shown that in moist environments and at sub-boiling temperatures, Ca-rich fly ashes react readily with gas-phase CO2 to produce robustly cemented solids. After seven days of exposure to vapor-phase CO2 at 75 °C, such formulations achieve a compressive strength of around 35 MPa and take-up 9% CO2 (i.e., by mass of fly ash solids). On the other hand, Ca-poor fly ashes due to their reduced alkalinity (i.e., low abundance of mobile Ca- or Mg-species), show limited potential for CO2 uptake and strength gain—although this deficiency can be somewhat addressed by the provision of supplemental/extrinsic Ca agents. The roles of CO2 concentration and processing temperature are discussed, and linked to the progress of reactions and the development of microstructure. The outcomes create new pathways for achieving clinkering-free cementation while enabling the beneficial utilization (“upcycling”) of emitted CO2 and fly ash; i.e., two abundant, but underutilized industrial by-products.

    更新日期:2017-12-14
  • CO2 chemisorption enhancement produced by K2CO3- and Na2CO3-addition on Li2CuO2
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-01
    Irene Ham-Liu, J. Arturo Mendoza-Nieto, Heriberto Pfeiffer
    更新日期:2017-12-14
  • Gas phase electrochemical conversion of humidified CO2 to CO and H2 on proton-exchange and alkaline anion-exchange membrane fuel cell reactors
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-01
    Guoliang Wang, Jian Pan, San Ping Jiang, Hui Yang

    Fuel cell reactors or electrolyzers based on alkaline anion-exchange membrane and proton exchange membrane (AAEM & PEM) are investigated for gas phase electrochemical conversion of humidified CO2 under identical conditions, using conventional Pt/C, Pd/C and Cu/CNTs as cathodic catalysts. Humidified CO2 can be converted to H2 and CO via the AAEM based fuel cell reactors with an estimated onset potential of −1.0 V using Cu/CNT as cathodic catalyst, while PEM based fuel cell reactors can only produce H2 under identical conditions. This can be attributed to the suppressed hydrogen evolution and enhanced CO2 reduction in the case of AAEM based reactor. Remarkably, AAEM based reactor with Cu/CNT cathode catalysts shows a higher activity (8.88 μmol h−1 cm−2) to convert CO2 to CO than that of Pd/C (7.59 μmol h−1 cm−2) and Pt/C (0.75 μmol h−1 cm−2) at the same catalyst loading. This study indicates that AAEM based reactor is able to realize the gas phase electrochemical conversion of CO2, providing a viable strategy for CO2 utilization and conversion to useful fuels.

    更新日期:2017-12-14
  • Supercritical CO2 technology applied to the production of flavor ester compounds through lipase-catalyzed reaction: A review
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-06
    Arthur Luiz Baião Dias, Philipe dos Santos, Julian Martínez
    更新日期:2017-12-14
  • CaO-based CO2 sorbents: A review on screening, enhancement, cyclic stability, regeneration and kinetics modelling
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-06
    Shakirudeen A. Salaudeen, Bishnu Acharya, Animesh Dutta

    This article reviews current developments in metal-based sorbents for carbon capture with emphasis on calcium oxide. A broad overview of carbon dioxide capture with metals in various forms including oxides, hydroxides, carbonates and zirconates is presented. Based on the findings from comparative assessments of these sorbents, CaO appears to be the best solid sorbent for CO2 capture at high temperatures, and its numerous advantages are discussed in this work. For this reason, a detailed review has been conducted for calcium oxide, which works as a sorbent at temperatures up to 700 °C through carbonation, and desorbs CO2 above 700 °C by calcination of CaCO3 at atmospheric pressure. A review of studies on kinetics modelling of CO2 capture with CaO-based sorbents is also included in this work. Decay in activity caused by sintering and attrition is identified as the greatest challenge with CaO-based sorbents. This work also focuses on the available techniques for enhancing performance and cyclic stability. Reactivation of the sorbents by hydration and reduction in decay rate by doping with inert supports and synthetic sorbents are reviewed. Additionally, the use of biomass resources (waste animal shells) as competitive sources of CaCO3 is discussed in this work. The review concludes with recommendations for future studies in carbon capture and sequestration.

    更新日期:2017-12-14
  • Nickel supported on YSZ: The effect of Ni particle size on the catalytic activity for CO2 methanation
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-06
    Jagadesh Kopula Kesavan, Igor Luisetto, Simonetta Tuti, Carlo Meneghini, Giovanna Iucci, Chiara Battocchio, Settimio Mobilio, Stefano Casciardi, Renata Sisto
    更新日期:2017-12-14
  • Advances in catalytic homogeneous hydrogenation of carbon dioxide to methanol
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-12-06
    Sayan Kar, Jotheeswari Kothandaraman, Alain Goeppert, G.K. Surya Prakash

    Increase in atmospheric CO2 concentration due to the combustion of fossil fuels has been linked to the presently observed global warming phenomenon. In order to mitigate excessive emissions, efforts are underway to capture CO2 from various emission sources and sequester it underground. In parallel, utilization of the captured CO2 to produce value added products and fuels has also been advocated. Among these products, methanol, which can be used as a fuel and fuel additive, is of particular interest. Methanol can be synthesized by hydrogenation of CO2 and could therefore lead to a carbon neutral cycle in the frame of a methanol economy, as proposed by the late professor George Olah. In this review, we reflect upon the recent advances in homogeneous reduction of CO2 to methanol using molecular H2. This research area has seen significant progress over the last five years and the recent studies for this challenging transformation are discussed herein. Catalyst activity, selectivity, reaction mechanism and other aspects are analyzed. We also comment on future prospects awaiting exploration to improve the catalytic systems for this reduction. We hope that this review will provide the reader with an overview of the current state of the art on homogeneous CO2 hydrogenation to methanol in a concise manner and provide potential directions in which further investigations can be undertaken in order to eventually make this process economically viable.

    更新日期:2017-12-14
  • Experimental study for the reduction of CO2 emissions in wastewater treatment plant using microalgal cultivation
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-12
    F. Iasimone, V. De Felice, A. Panico, F. Pirozzi

    Wastewater treatment plants (WWTPs) contribute to CO2 emissions in atmosphere through direct (biological metabolism) and indirect (fuel combustion) oxidation of organic carbon. This detrimental effect of WWTPs operation can be mitigated by integrating the traditional treatment with a microalgae cultivation pond where CO2 is fixed into autotrophic biomass and the positive side effect of removing nutrients also takes place. To test the feasibility of this modified WWTPs configuration, a pilot-scale 200 L raceway pond, operating outdoor, was designed and used for biomass cultivation in untreated urban wastewater. Nitrogen gas enriched with 20% CO2, simulating the exhausted gas of biogas combustion, was supplied continuously during daytime at different flowrates. The dynamics of microalgae growth as well as inorganic carbon and nutrients uptake were studied during the pond start-up and semi-continuous feeding conditions. The absorbed bio-available CO2 was monitored during daylight for different gas flowrates (0.2, 0.4 and 1.0 L/min) and for wastewater semi-continuous feeding conditions (0.8 L/h). The highest efficiency, equal to 83%, of bio-available CO2 fixation was obtained for the lowest gas flowrate of 0.2 L/min., whereas the highest CO2 removal rate of 24.6 mg/L/min was reached for the highest gas flowrate of 1.0 L/min. Furthermore, this operating condition resulted in the highest microalgae biomass productivity of 28.3 g/d/m2. Nutrients removal was complete for each operating condition tested.

    更新日期:2017-12-14
  • 更新日期:2017-12-14
  • Modified TiO2 photocatalyst for CO2 photocatalytic reduction: An overview
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-19
    Hamidah Abdullah, Md. Maksudur Rahman Khan, Huei Ruey Ong, Zahira Yaakob

    The photocatalytic pathway to reduce carbon dioxide (CO2) to fuel, an artificial photosynthesis process, is a futuristic and ultimate way to combat the energy crisis and CO2 emission issues. The most widely used catalyst for photocatalytic reactions is titanium dioxide (TiO2) due to its availability, chemical stability, low cost and resistant to corrosion. Although TiO2 photocatalyst suffers due to its wide band gap (only can be activated under ultraviolet light irradiation) and high electron-hole recombination rate, it remained as a precursor for the development of visible light responsive materials for CO2 reduction through different modifications, such as doping of metal, nonmetal, semiconductors etc. There is a significant improvement in CO2 conversion using the visible light responsive TiO2 based catalysts. The product distribution due to the photocatalytic reduction of CO2 highly depends on the band gap and band edges of the catalyst. The understanding in the mechanistic pathway of CO2 reduction is very important to design the catalyst for the production of desired product. This present paper provides an overview of research and development of TiO2 based photo-catalysts for CO2 reduction and focuses on the improvement of the photocatalyst based on the band gap engineering, charge transfer and CO2 adsorption. Moreover, the challenges and future prospect in the developing modified TiO2 for photocatalytic reduction of CO2 has also been discussed.

    更新日期:2017-12-14
  • Membrane Reactor for one-step DME synthesis process: Industrial plant simulation and optimization
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-19
    Marcello De Falco, Mauro Capocelli, Alberto Giannattasio

    DME production represents a possible route of CO2 valorisation in the decarbonization pathway. This paper provides an insight into the basic design and process analysis of a DME production plant by implementing Membrane Reactors to convert CO2 at acceptable values. The paper provides the process analysis of the overall plant architecture related to an innovative DME production process configuration, called Double Recycling Loop DME (DRL-DME), enables the utilization of a pure CO2 stream as sweeping gas in the permeation zone (PZ) and a double recycling loop to reintroduces the un-reacted syngas and the outlet stream from the PZ. The mathematical model of the entire plant is presented and implemented to study the effect of the process parameters on the performances. This paper brings a step forward by determining the possible configuration and the performance of a whole industrial plant, able to realize the DME synthesis from CO2-rich streams in membrane reactor with recirculation. The whole process includes the utilization of a pure CO2 external feed, the steam production and all the necessary separation units. By fixing the set point of the process control variables, the recirculation streams are calculated though a mathematical algorithm founded on previous literature results. Through the mathematical model it is possible to estimate the CO2 conversion and DME yield as well as the main features of the plant, by varying some important process parameters (e.g. feedstock composition, reactor pressure, H2/COx).

    更新日期:2017-12-14
  • Benzyl substituted imidazolium ionic liquids as efficient solvent-free catalysts for the cycloaddition of CO2 with epoxides: Experimental and Theoretic study
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-20
    Tengfei Wang, Danning Zheng, Yuan Ma, Jiayi Guo, Zhipeng He, Bin Ma, Lianhuan Liu, Tiegang Ren, Li Wang, Jinglai Zhang

    A series of low-cost and easily prepared benzyl substituted imidazolium ionic liquids are firstly synthesized and employed as catalyst for the cycloaddition of carbon dioxide with epoxides without any solvent and co-catalyst. The synthesized imidazolium ionic liquids are characterized by 1H NMR, HRMS, and MS. The influence of different substituted groups in cation and reaction parameters on catalytic activity is investigated. The highest conversion yield of cyclic carbonate (94.89%) could be achieved with slight amount of catalyst (0.25 mol%) under 130 °C and 2.0 MPa during 4 h. Meanwhile, the mechanisms of cycloaddition of carbon dioxide with epoxides catalyzed by four benzyl substituted ionic liquids with different substituted groups are investigated by theoretical calculations. The role of hydrogen bond and other noncovalent interactions played in catalytic process is further uncovered to deeply understand the difference of various catalysts from atomistic level.

    更新日期:2017-12-14
  • CO2-assisted high pressure processing on inactivation of Escherichia coli and Staphylococcus aureus
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-21
    Liang Zhao, Xiao Qin, Yongtao Wang, Jiangang Ling, Weile Shi, Sicheng Pang, Xiaojun Liao

    CO2-assisted high pressure processing was termed as CO2-HPP, and the inactivation of Escherichia coli and Staphylococcus aureus in liquid samples were treated by CO2-HPP in this study. When CO2 made up 20% of the total volume, it exhibited assisted inactivation of E. coli and S. aureus in phosphate buffered saline (PBS, pH 7.0) under HPP. Twenty percent CO2-300 MPa/3 min induced 1.0 and 2.5 more log units reduction of E. coli and S. aureus than 300 MPa/3 min, respectively. Both mid-exponential and stationary phase cells of E. coli and S. aureus showed higher sensitivity to CO2-HPP than HPP. However, the two microbes showed different inactivation behavior in real food of cucumber juice (pH 6.6) and apple juice (pH 4.3), and CO2-HPP was more suitable for S. aureus than E. coli in the two juices. As compared with HPP, CO2-HPP showed more severe damage on morphology and intracellular structure of E. coli and S. aureus cells through transmission electron microscopy (TEM), scanning electron microscopy (SEM), and flow cytometer microscopy (FCM), including appearance of collapsed cells, cell disruption, and more holes on cell membrane, membrane permeability, and strength of cytoplasm aggregation, which were probably due to the penetration, explosion, and acidification of CO2 under HPP. The CO2-assisted inactivation of bacteria subject to HPP has the potential application in food industry, especially for liquid food.

    更新日期:2017-12-14
  • Catalytic behavior of manganese oxides for oxidative dehydrogenation of ethylbenzene with carbon dioxide
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-25
    Kai Ren, Jian Song, Yong-Hong Song, Huan Wang, Zonghuai Liu, Zhao-Tie Liu, Jinqiang Jiang, Zhong-Wen Liu

    Manganeses oxides (MnOx) with different crystal and structural properties were prepared by the precipitation, the complex-decomposition, and the thermal decomposition methods, respectively. The materials were characterized by XRD, SEM, TEM, H2-TPR, TG-DSC, XPS, and N2 adsorption/desorption at low temperatures. The samples were comparatively evaluated as catalysts for the oxidative dehydrogenation of ethylbenzene with carbon dioxide (CO2-ODEB). Results indicate that both Mn2O3 and Mn3O4 were active for CO2-ODEB and the Mn3O4 prepared by the precipitation method showed the highest conversion of ethylbenzene over 60%. Moreover, the activity of MnOx for CO2-ODEB was significantly affected by the synthesis method and parameters of the oxides. The correlation between the reaction and characterization results indicates that the CO2-ODEB over MnOx may follow the redox mechanism involving the lattice oxygen, and the amount of the mobile oxygen species and the surface area were revealed to be key factors in determining the activity of the MnOx catalysts for the titled reaction. Together with the characterization results of XRD, TG-DSC, and H2-TPR, the irreversible reduction of MnOx to MnO under the conditions of CO2-ODEB was the main reason for the deactivation of the catalyst while the coke deposition had a less important impact on the stability of the catalyst.

    更新日期:2017-12-14
  • Optimization of the Pd/Cu ratio in Pd-Cu-Zn/SiC catalysts for the CO2 hydrogenation to methanol at atmospheric pressure
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-25
    J. Díez-Ramírez, J.A. Díaz, P. Sánchez, F. Dorado
    更新日期:2017-12-14
  • Fly ash-derived MCM-41 as a low-cost silica support for polyethyleneimine in post-combustion CO2 capture
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-11-06
    R. Panek, M. Wdowin, W. Franus, D. Czarna, L.A. Stevens, H. Deng, J. Liu, C. Sun, H. Liu, C.E. Snape

    The mesoporous silicate molecular sieve, MCM-41, has been synthesized from pulverized coal fly ash (PFA), where the silicate filtrate used is a by-product from hydrothermal zeolite production. Rice husk ash was also used for comparison but fusion with sodium hydroxide was used to prepare the silicate filtrate, along similar lines to earlier reports of using PFA as a precursor for MCM-41 synthesis. The MCM-41 samples are chemically and mineralogically similar to a commercially available sample, but with higher pore volumes dominated by mesopores (0.92–1.13 cf. 0.88 cm3 g−1). After polyethyleneimine (PEI) impregnation for CO2 capture, the ash derived MCM-41 samples displayed higher uptakes than the commercial sample with the maximum achievable PEI loading of 60 Wt.% PEI (dry basis) before particle agglomeration occurs, approximately 13 compared to 11 Wt.%, respectively, the latter being comparable to earlier reports in the literature. The PFA sample that displays the fastest kinetics to achieve 90% of the equilibrium uptake had the largest mesopore volume of 1.13 cm3 g−1. Given the PFA-derived MCM-41 uses a waste silicate solution for hydrothermal preparation and no prior preparation is needed, production costs are estimated to be considerable lower where silicate solutions need to be prepared by base treatment, even if ash is used, as for the RHA derived MCM-41 used here.

    更新日期:2017-12-14
  • Development of a novel synthesis-gas production system combining with carbon capture
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-28
    Wataru Kawasaki, Hidenori Kato, Ratchahat Sakhon, Ryo Watanabe, Choji Fukuhara
    更新日期:2017-12-14
  • Chemical engineering aspects of plasma-assisted CO2 hydrogenation over nickel zeolites under partial vacuum
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-30
    Federico Azzolina-Jury, Diogo Bento, Carlos Henriques, Frédéric Thibault-Starzyk
    更新日期:2017-12-14
  • Strategic use of CO2 for co-pyrolysis of swine manure and coal for energy recovery and waste disposal
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-30
    Sang-Ryong Lee, Jechan Lee, Taewoo Lee, Yiu Fai Tsang, Kwang-Hwa Jeong, Jeong-Ik Oh, Eilhann E. Kwon

    Here in this study, the genuine role of CO2 in co-pyrolysis of swine manure and coal was mainly investigated to increase the thermal efficiency of the thermo-chemical process. The TGA test of swine manure and coal revealed that the CO2 co-feeding impact on any reactions (≤740 °C) between CO2 and the sample surface (i.e., heterogeneous reaction) should be excluded. A batch-type co-pyrolysis revealed two genuine CO2 co-feeding impacts on co-pyrolysis of swine manure and coal. First, CO2 can be an additional source for C and O through a plausible reaction between pyrolytic oil and CO2, which led to the enhanced generation of CO by the conversion of volatile organic carbons (VOCs) evolved from thermal deconstruction of pyrolytic substrate. Second, CO2 expedite the thermal cracking of VOCs, which also resulted in the more generation of H2 and CH4. Two genuine roles of CO2 in co-pyrolysis of swine manure and coal occurred independently. All experimental findings will be directly applicable to the gasification process since pyrolysis is an intermediate step for the gasification.

    更新日期:2017-12-14
  • Efficient production of formic acid by simultaneous photoreduction of bicarbonate and oxidation of glycerol on gold-TiO2 composite under solar light
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-09-30
    Hanqing Pan, Alexzander Steiniger, Michael D. Heagy, Sanchari Chowdhury
    更新日期:2017-12-14
  • 更新日期:2017-12-14
  • Facile synthesis of 2-benzimidazolones via carbonylation of o-phenylenediamines with CO2
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-10-09
    Manuri Brahmayya, Shenghong A. Dai, Shing-Yi Suen
    更新日期:2017-12-14
  • Calcium-Looping performance of steel and blast furnace slags for thermochemical energy storage in concentrated solar power plants
    J. CO2 UTIL. (IF 4.292) Pub Date : 2017-10-11
    Jose Manuel Valverde, Juan Miranda-Pizarro, Antonio Perejón, Pedro E. Sánchez-Jiménez, Luis A. Pérez-Maqueda

    The Calcium Looping (CaL) process, based on the carbonation/calcination of CaO, has been proposed as a feasible technology for Thermochemical Energy Storage (TCES) in Concentrated Solar Power (CSP) plants. The CaL process usually employs limestone as CaO precursor for its very low cost, non-toxicity, abundance and wide geographical distribution. However, the multicycle activity of limestone derived CaO under relevant CaL conditions for TCES in CSP plants can be severely limited by pore plugging. In this work, the alternative use of calcium-rich steel and blast furnace slags after treatment with acetic acid is investigated. A main observation is that the calcination temperature to regenerate the CaO is significantly reduced as compared to limestone. Furthermore, the multicycle activity of some of the slags tested at relevant CaL conditions for TCES remains high and stable if the treated samples are subjected to filtration. This process serves to remove silica grains, which helps decrease the porosity of the CaO resulting from calcination in the mesoporous range thus mitigating pore plugging.

    更新日期:2017-12-14
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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