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  • CO and C3H6 oxidation over platinum-group metal (PGM) catalysts supported on Mn-modified hexagonal YbFeO3
    Catal. Today (IF 4.667) Pub Date : 2018-07-10
    Saburo Hosokawa, Shogo Matsumoto, Kenya Onishi, Hiroyuki Asakura, Kentaro Teramura, Tsunehiro Tanaka

    The oxidations of CO and C3H6 are important model reactions for environmental cleanup reactions such as the purification of automotive exhaust gases from diesel engine or of volatile organic compounds. Mn-modified hexagonal YbFeO3 (Mn-h-YbFeO3), synthesized by a solvothermal method, exhibits excellent catalytic activities for these oxidations despite the absence of platinum-group metal (PGM) loading. The activity of Mn-h-YbFeO3 itself is dramatically enhanced by the addition of a small amount of Pd or Ru; these species supported on the Mn-h-YbFeO3 act as promoters that improve the CO- or C3H6- adsorption/desorption ability and the oxygen release property from the Mn-h-YbFeO3. PGM/Mn-h-YbFeO3 catalysts show much higher catalytic activities than Al2O3-supported PGM catalysts in which Al2O3 support is inert for these reactions. We expect that the establishment of such promoter effects for catalyst support having high catalytic activity will provide novel guidelines for reducing the use of precious-metal resources.

    更新日期:2018-07-12
  • Direct Hydroxylation of Benzene to Phenol on h-BCN Nanosheets in the Presence of FeCl3 and H2O2 under Visible Light
    Catal. Today (IF 4.667) Pub Date : 2018-07-10
    Bo Wang, Masakazu Anpo, Jing Lin, Can Yang, Yongfan Zhang, Xinchen Wang

    The preparation of ternary hexagonal boron carbon nitride (h-BCN) nanosheets was carried out by doping biomass glucose in situ into hexagonal boron nitride (h-BN). With this method, the construction of a two-dimensional (2D) semiconductor with tunable bandgap and characteristic adsorption ability toward organic molecules was achieved by maintaining the specific structure of h-BN and π-π interactions toward aromatic compounds. The ternary 2D h-BCN nanosheets worked effectively not only as a desirable adsorbent but also as an activator to benzene. Furthermore, the unique 2D h-BCN nanosheets were found to work as effective photocatalysts to convert benzene into phenol with less over-oxidation, leading to the development of a new type of Fenton oxidation reaction as the one-step visible light-driven hydroxylation of benzene. An optimal yield of 14.0% and its selectivity of 88.3% for the photocatalytic production of phenol from benzene were achieved by using h-BCN in the presence of FeCl3 and H2O2 in sustaining the same reactivity even after 4 cycles. The present study reports this latest development of phenol production from benzene by applying 2D h-BCN nanosheets as an artificial photosynthetic catalyst.

    更新日期:2018-07-12
  • Photoelectrochemical properties of BiVO4 thin film photoanodes with high Mo content prepared by aerosol pyrolysis
    Catal. Today (IF 4.667) Pub Date : 2018-07-10
    Š. Paušová, M. Uriburu Gray, M. Neumann-Spallart, J. Krýsa

    This study describes the preparation by aerosol pyrolysis and characterization of pure and Mo containing semiconducting BiVO4 thin films for application as a photoanode in photoassisted water electrolysis and photoelectrocatalysis. The optimum deposition temperature was 650 °C. Pure BiVO4 films had a monoclinic distorted Scheelite structure. This polymorph has a lower bandgap (2.4 eV) than the tetragonal zircon group phase (2.9 eV), which makes it more desirable for solar irradiation based photo(electro)chemical applications. Addition of Mo (14%) led to the formation of the tetragonal Scheelite type phase and significantly increased the photocurrent (from 20 to 400 µA/cm2 and from 400 to 1100 µA/cm2 at 0.6 V and 1.2 V vs. Ag/AgCl, respectively, under AM1.5 simulated solar illumination). The IPCE (incident photon to current conversion efficiency) at 405 nm was 0.24 for backside illumination at 2 V vs. RHE.

    更新日期:2018-07-12
  • High Pt Utilization Efficiency of Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media
    Catal. Today (IF 4.667) Pub Date : 2018-07-10
    Ningqiang Zhang, Lingcong Li, Ya Chu, Lirong Zheng, Shaorui Su, Guizhen Zhang, Hong He, Jinsheng Zhao

    Electrocatalyst for oxygen-reduction reaction (ORR) is crucial for metal-air batteries, in which Pt-based materials are the benchmark catalysts for ORR. However, the high cost and limited supplies of Pt limit its broad use in commercial applications. Designing highly efficient Pt electrocatalysts can reduce material cost and enable commercial success for a wide variety of electrochemical technologies. Herein, we prepared Pt/MnOx and Pt/MnO electrocatalysts via deposition–precipitation and H2–reduction approaches. The Pt mass activities towards the ORR at 0.7 V for the Pt/MnOx, and Pt/MnO catalysts were 4.0 and 3.7 A mgPt-1, respectively, which were 20, and 18.5 times as commercial 20% Pt/C catalyst. The transferred electron numbers (n) were 3.6 and 4.0 for Pt/MnOx and Pt/MnO, respectively. Moreover, Pt/MnO catalyst exhibited a good ORR stability after 500 cycles compared to Pt/MnOx catalyst in 0.1 M KOH.

    更新日期:2018-07-12
  • Simulation on soot deposition in in-wall and on-wall catalyzed diesel particulate filters
    Catal. Today (IF 4.667) Pub Date : 2018-07-10
    Hyeonoh Kong, Kazuhiro Yamamoto

    In order to decrease the regeneration temperature of diesel soot deposited in the diesel particulate filter (DPF), the catalyzed DPF is generally used. Since the catalyst is made of expensive noble metals such as platinum, it is better to reduce the amount of catalyst. For that purpose, we need to know the influence of the catalyst on the soot deposition process. In this study, the flow and the soot deposition of the catalyzed DPF (CDPF) have been simulated. The substrate structure of the filter was obtained by an X-ray CT technique. Here, two types of the catalyst coating were considered, which were in-wall and on-wall CDPFs. For both cases, we set the same amount of catalyst. The effects of the catalyst on the pressure drop were evaluated by comparing the simulation without the catalyst. The permeability of the catalyst layer was estimated based on the experimental pressure drop. In particular, the contact ratio of the deposited soot and the catalyst layer was discussed to obtain the information on the regeneration efficiency. It was found that, due to the catalyst, the soot deposition process was affected. Resultantly, the pressure drop of the on-wall CDPF was smaller than that of the in-wall CDPF. In the case of the on-wall CDPF, more deposited soot can be contacted with the catalyst layer, suggesting the higher efficiency for the filter regeneration.

    更新日期:2018-07-12
  • Catalytic activity of advanced titanosilicate zeolites in hydrogen peroxide S-oxidation of methyl(phenyl)sulfide
    Catal. Today (IF 4.667) Pub Date : 2018-07-10
    Iveta Martausová, Daniela Spustová, Daniel Cvejn, Alexandr Martaus, Zdenek Lacný, Jan Přech

    Titanium-containing zeolite-based catalysts have been synthesized and investigated as catalysts in methyl(phenyl)sulfide oxidation with hydrogen peroxide. A hierarchical TS-1 prepared by the secondary templating and a layered TS-1 without and with silica and silica-titania pillars have been studied. Conventional TS-1 was a benchmarking material. The study focuses on observation of the different catalytic performance with regard to textural properties; presence and volume of mesopores and different diffusion characteristics. Thus, a deficiency and excess of the oxidizing agent were used in the catalysed reactions and the progress of reaction and selectivity to products were studied. All tested catalysts have shown after 240 min almost total conversion of methyl(phenyl)sulfide with different selectivity (substrate/catalyst mass ratio 10). It was observed that the reactants ratio hydrogen peroxide/ methyl(phenyl)sulfide influences the selectivity to sulfoxide or sulfone over a particular catalyst. In the case of hydrogen peroxide deficiency experiments (H2O2/sulfide = 0.5 mol/mol) the catalysts exhibited different distributions of products. Lamellar catalyst provided 100 % selectivity to sulfoxide, the others in range of 90-65 % selectivity to sulfoxide; however, the selectivity was independent on the reaction time and substrate conversion. In the case of the excess of the oxidant, except for Ti-pillared TS-1, all the catalysts showed stabile selectivity of 65 % towards methyl(phenyl)sulfoxide being independent of the catalyst. The Ti-pillared TS-1 has shown, during the reaction progress, a decrease in the selectivity to sulfoxide from initial 60 % to final 20 % of sulfoxide at almost total conversion. The only case when higher selectivity to sulfone was achieved was gradual dosing of hydrogen peroxide.

    更新日期:2018-07-12
  • Photocatalytic Asphalt Mixtures: Mechanical Performance and Impacts of Traffic and Weathering Abrasion on Photocatalytic Efficiency
    Catal. Today (IF 4.667) Pub Date : 2018-07-11
    Iran Gomes da Rocha Segundo, Salmon Landi, Sérgio Manuel Batista Oliveira, Elisabete Fraga de Freitas, Joaquim Alexandre O. Carneiro

    The photocatalytic asphalt mixture provides safer roads and mitigates the air quality problems, trapping and degrading organic compounds and also harmful gases. In this research, an asphalt mixture was functionalized with nano-TiO2 by bulk incorporation, using the contents 3 and 6%, and by spraying coating using an aqueous solution over its surface at different temperatures and rates. For bulk incorporation, the mechanical performance was assessed. The factors – application procedure, influence of temperature, spraying rate, incorporation percentage and TiO2 immobilization (from traffic and rain removal) – were evaluated based on Rhodamine B (RhB) degradation. For bulk incorporation, the best content nano-TiO2 was 3%. The temperature of the substrate has no influence on the photocatalytic results. The most effective spraying rates were 8 and 16 mL/cm2. Before simulating the traffic effect, the spraying coating technique was more effective than the bulk incorporation one. After this process, the opposite behavior was detected. The rain simulation did not cause removal of the nanoparticles. Additionally, the exposed aggregates affected the photocatalytic efficiency, being important their contribution combined to the effect of nano-TiO2. To have the maximum benefit of the techniques studied, the ideal solution would be the combination of both, with negligible impact on mechanical performance.

    更新日期:2018-07-12
  • A novel two-dimensional MgO-h-BN nanomaterial supported Pd catalyst for CO oxidation reaction
    Catal. Today (IF 4.667) Pub Date : 2018-07-11
    Li Lingcong, Liu Xiaojun, He Hong, Zhang Ningqiang, Liu Ziwen, Zhang Guizhen

    The MgO-doped hexagonal boron nitride (MgO-h-BN) nanomaterials were designed as a support for Palladium (Pd) catalysts for CO oxidation reaction. The catalytic properties of Pd/MgO(5)-h-BN catalyst was investigated and compared with Pd/h-BN catalyst. Transmission electron microscopy (TEM) results suggested that the PdO nanoparticles with small grain sizes (ca. 8 nm) were effectively dispersed on the surface of MgO, and the MgO were deposited on the h-BN nanosheets in the Pd/MgO(5)-h-BN catalyst. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses revealed that a small amount of Mg2+ embedded into the B vacancies of h-BN nanosheets in the Pd/MgO(5)-h-BN catalyst. More significantly, a large amount of adsorbed oxygen appeared near the B vacancies of Pd/MgO(5)-h-BN catalyst. The experiments outcomes of diffuse reflectance fourier transform spectra analysis of CO (CO-DRIFT) indicated that the carbonate/formate species were easily decomposed to CO2 on the Pd/MgO(5)-h-BN catalyst than Pd/h-BN catalyst, which might be a reason why the Pd/MgO(5)-h-BN catalyst had high CO oxidation activity. According to above analyses, we provide a new insight for the MgO-h-BN nanomaterials for Pd catalysts for application in CO oxidation reaction.

    更新日期:2018-07-12
  • Effect of ceria and zirconia supports on NO reduction over platinum-group metal catalysts: A DFT study with comparative experiments
    Catal. Today (IF 4.667) Pub Date : 2018-07-11
    Hiroaki Koga, Akihide Hayashi, Yoshinori Ato, Kohei Tada, Saburo Hosokawa, Tsunehiro Tanaka, Mitsutaka Okumura

    Understanding support effects at the molecular level is vital for improving the design of the platinum-group metal (PGM) three-way catalyst (TWC). As a first step, we performed density functional theory (DFT) calculations for tetrahedral M4 clusters (M = Pt, Pd, or Rh) supported on CeO2(111) and ZrO2(111) and examined their activity toward NO adsorption and reduction. We found that the M4 clusters are positively charged on ceria but close to neutral on zirconia. The site preference of NO adsorption is not affected much by changing ceria for zirconia. NO tends to gain slightly more negative charge from M4/ZrO2 than from M4/CeO2. The reaction of CO with adsorbed NO does not exhibit strong support dependence. In contrast, NO dissociation at the metal/oxide interface exhibits strong support dependence, with the transition state (TS) lowered by 0.7–1.1 eV by changing ceria for zirconia. This lowering occurs because Zr in ZrO2, carrying more positive charge than Ce in CeO2, interacts more strongly with the O end of NO to promote dissociation. The calculated TS energy for NO dissociation (as well as the dissociative adsorption energy) is strongly correlated with the NO-reduction activity obtained in our comparative TWC experiments. Thus, the ability of a catalyst to bind N and O, with the help of the oxide support, is key for the NO-reduction activity of PGM catalysts.

    更新日期:2018-07-12
  • Selective catalytic reduction of NO with CO and C3H6 over Rh/NbOPO4
    Catal. Today (IF 4.667) Pub Date : 2018-07-11
    Shinsuke Imai, Hiroki Miura, Tetsuya Shishido

    The selective catalytic reduction of NO with C3H6 and CO was investigated over platinum group metal (PGM; Pd, Rh, or Pt) supported on NbOPO4. Rh/NbOPO4 exhibits a lower light-off temperature of NO reduction to N2 compared to Pd- or Pt-loaded NbOPO4 catalysts and Rh/Al2O3 under stoichiometric conditions. Rh/NbOPO4 shows superior catalytic activity for NO reduction to Rh/Al2O3 under a wide range of lean conditions. Propylene (C3H6) was partially oxidized to reactive aldehyde species on Rh/NbOPO4, whereas less-reactive carboxylate species was generated and adsorbed on Rh/Al2O3. A highly dispersed Rh° nanoparticles on NbOPO4 was slowly oxidized by exposure to excess O2, but Rh on Al2O3 was readily oxidized to less-active Rh2O3. The high activity of Rh/NbOPO4 for C3H6 oxidation to reactive aldehyde species and the resistance of Rh° against oxidation results in the enhancement of NO reduction activity in a slightly lean region.

    更新日期:2018-07-12
  • Silica-supported Fe-Mo-O catalysts for selective oxidation of propylene glycol
    Catal. Today (IF 4.667) Pub Date : 2018-07-11
    D.Yu. Ebert, N.V. Dorofeeva, A.S. Savel’eva, T.S. Kharlamova, M.A. Salaev, V.A. Svetlichnyi, O.V. Magaev, O.V. Vodyankina

    Selective oxidation of propylene glycol is studied over silica-supported Fe-Mo-O catalysts with different Mo/Fe molar ratio. The catalysts are synthesized by wetness impregnation method and characterized by XRD, UV-vis, Raman spectroscopy, TPR and DFT methods. The catalytic properties are tested under gas phase conditions at 350 °C. The selectivity towards methylglyoxal formation is shown to be determined by the Mo/Fe molar ratio. The 55 % selectivity towards methylglyoxal is achieved at Mo/Fe molar ratio of 3:1 through O–H activation and C–H bond scission route. C–C bond cleavage route results in predominant formaldehyde formation at the Mo/Fe molar ratio of 1:2.

    更新日期:2018-07-12
  • Synthesis of Pt-MWW with Controllable Nanoparticle Size
    Catal. Today (IF 4.667) Pub Date : 2018-07-11
    Yuyan Zhang, Martin Kubů, Michal Mazur, Jiří Čejka

    Zeolites doped with metal nanoparticles have shown the outstanding activity in many processes involving heterogeneous catalysis. The size of metal nanoparticles plays a decisive role in the performance of zeolite catalysts. However, the precise control of the size of nanoparticles is still limited. Herein, we present the synthesis of Pt-MWW zeolites with controllable nanoparticle size using a series of surfactants with different alkyl chain lengths for swelling of layered MCM-22 P. The interlayer distances of swollen materials increases with the length of the surfactant from 1.06 nm (C12OH) to 2.89 nm (C18OH). During swelling, the Pt nanoparticles were intercalated to the interlayer space of MCM-22 P. Further calcination resulted in Pt-MWW materials showing similar morphologies, textural properties and Pt content despite the differences in the initial interlayer distances. The factor that differentiated the synthesized materials was the average diameter of metal nanoparticles. As a result, the average size of Pt nanoparticles increased from 0.85 nm (MCM-22-C12OH-Pt) to 2.04 nm (MCM-22-C18OH-Pt) which is related to the length of the hydrocarbon chain of the surfactant used for the swelling process.

    更新日期:2018-07-12
  • Reactivity study of CO+NO reaction over Pd/Al2O3 and Pd/CeZrO2 Catalysts
    Catal. Today (IF 4.667) Pub Date : 2018-07-09
    Xiaoyin Chen, Yimeng Lyu, Uzoma Nwabara, Johannes W. Schwank

    To elucidate the reactions involved in the three-way catalyst under stoichiometric conditions, the reactivity of CO + NO has been studied by continuous flow and surface reactions over Pd supported on Ce0.75Zr0.25O2 (CZO) and Al2O3 model catalysts with different Pd particles sizes and oxidation states. Pd/CZO showed higher activity with complete NO removal at 125 °C than Pd/Al2O3 at 300 °C As a primary by-product, N2O was produced on both catalysts prior to reaching complete CO conversion in a 1:1 NO/CO feed ratio. NO inhibition through N2O formation was intensified when 2:1 NO/CO feed ratio was used, where the complete CO conversion can’t be achieved during the course of the reaction. When 1:1 NO/CO feed ratio was used over Pd/Al2O3, a concave feature in the CO light-off curve was observed, where the CO light-off curve showed a downward inflections after complete NO conversion had been reached, and then started to increase again with further increase in temperature. The inflection of CO conversion coincided with the maximum yield of N2O vs. reaction temperature. It was also found that the CO + NO reactivity was affected by the Pd oxidation state and particles size. In situ DRIFT experiments showed that the formation of NCO and NCO-derived N2O intermediate species is closely related to the inflection of CO conversion. A pathway of N2O formation via the NCO intermediate species has been proposed to be responsible for the fallback in CO conversion when the reaction temperature increased, as both interactions of “NCOad + Nad” and “NCOad + NOad," which produce N2 and N2O, respectively, consume NO but generate CO.

    更新日期:2018-07-10
  • Direct Chemical Conversion of Xylan into Furfural over Sulfonated Graphene Oxide
    Catal. Today (IF 4.667) Pub Date : 2018-07-09
    Pravin P. Upare, Do-Young Hong, Jaesung Kwak, Maeum Lee, Sachin K. Chitale, Jong-San Chang, Dong Won Hwang, Young Kyu Hwang

    Graphene oxide (GO) grafted with –SO3H group giving a Brønsted acidic function was successfully applied for selective conversion of xylan to furfural (FA), which can be utilized as a platform chemical for a variety of value-added derivatives. The sulfonated graphene oxide (GO–SO3H) was, for the first time, found to be superior for the selective production of FA with 86% yield from xylan in water as a green solvent. GO–SO3H was successfully recycled after the reaction, and retained its catalytic activity without significant reduction. It is noteworthy that the Brønsted acid site acts as a key role in the production of furfural from xylan. Additionally, the presence of oxy-functional groups not only strengthen grafting of –SO3H with GO which probably prevented leaching into the reaction medium, but also helps to enhance the sorption capacity of substrate on GO-SO3H.

    更新日期:2018-07-10
  • Metal-free amino-incorporated organosilica nanotubes for cooperative catalysis in the cycloaddition of CO2 to epoxides
    Catal. Today (IF 4.667) Pub Date : 2018-07-09
    Shengbo Zhang, Xiao Liu, Mei Li, Yan Wei, Gefei Zhang, Jinyu Han, Xinli Zhu, Qingfeng Ge, Hua Wang

    The novel amino-incorporated benzene-bridging organosilica nanotubes (AM-NT) were used to efficiently catalyze the cycloaddition of CO2 to epoxides, producing cyclic carbonates under mild conditions. The highest activity was achieved on AM0.4-NT nanotubes with a pore diameter of ~7 nm and a length of ~60 nm in presence of tetrabutylammonium iodide (TBAI). The remarkably enhanced catalytic performance could be ascribed to the cooperative effect of the silanols as acid sites and the amino groups as basic sites, facilely generated in the channel, as well as the transport of substrates and products facilitated by the nanotubes with large pore diameters and short lengths as well as hydrophobicity. Moreover, the catalyst exhibited effective catalytic activity for a broad range of epoxides with a reasonable reusability.

    更新日期:2018-07-10
  • Plasmonic catalysis of Ag nanoparticles deposited on CeO2 modified mesoporous silica for the nitrostyrene reduction under light irradiation conditions
    Catal. Today (IF 4.667) Pub Date : 2018-07-09
    Priyanka Verma, Yasutaka Kuwahara, Kohsuke Mori, Hiromi Yamashita

    Plasmonic photocatalysis caused by surface plasmon resonance (SPR) has emerged out as an impressive way for efficient light absorption and solar light conversion. A series of catalysts consisting of plasmonic Ag nanoparticles (NPs) deposited on CeO2 coated mesoporous silica, SBA-15, prepared by MW-assisted alcohol reduction method were tested for the chemoselective hydrogenation of p-nitrostyrene. A remarkable increase in the reaction rate occurred when the catalyst support contained specific composition (2 wt %) of CeO2 on silica. The structure and properties of the prepared catalysts were studied by using a range of physicochemical characterization tools; UV–vis, transmission electron microscopy (TEM), X-ray absorption fine structure (XAFS), X-ray photoelectron spectroscopy (XPS) and N2-physisorption measurement studies. The challenging reduction of p-nitrostyrene containing an easily reducible group was examined in an ethanol suspension under mild reaction conditions using ammonia borane (AB) as an in-situ source of hydrogen. The highest conversion (100 %) and 90 % product yield in the hydrogenation of p-nitrostyrene to p-aminostyrene was achieved on the catalyst with 1.0 weight % loading of Ag NPs and 2 weight % of CeO2 supported on silica.

    更新日期:2018-07-10
  • Role of group V elements on the hydrogenation activity of Ni/TiO2 catalyst for the vapour phase conversion of levulinic acid to γ-valerolactone
    Catal. Today (IF 4.667) Pub Date : 2018-07-09
    Ganga Bhavani Peddakasu, Vijay Kumar Velisoju, Manasa Kandula, Naresh Gutta, Komandur VR Chary, Venugopal Akula

    Influence of group V elements such as Ta, Nb and V on the product distribution in the vapour phase hydrogenation of levulinic acid (LA) over Ni/TiO2 catalyst was examined at ambient pressure. The Nb promoted Ni/TiO2 demonstrated a high selectivity towards γ-valerolactone (GVL) compared to other catalysts at 275 °C. The TPR results showed a lower H2 uptake over Ta and V modified Ni/TiO2 which was explained due to a strong interaction between these oxide species with nickel. Presence of a high ratio of ionic nickel (Ni2+) on Ta and V modified catalyst could be a possible reason for the formation of valeric acid (VA) through the ring opening of GVL. The high GVL selectivity over the Ni-Nb/TiO2 catalyst attributed to the presence of a high proportion of Lewis acid sites in conjunction with finely dispersed Ni species on the catalyst surface. This however, is accomplished by the pyridine adsorbed diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and CO-chemisorption results.

    更新日期:2018-07-10
  • Large-scale pattern fabrication of 3D rGO-Ag@Ag3PO4 hydrogel composite photocatalyst with the excellent synergistic effect of adsorption and photocatalysis degradation
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Zengyuan Li, Tong Chen, Sen Liu, Mengyu Zhao, Kai Chen, Daimei Chen, Jie Chen

    A novel visible-light driven 3D porous network structure rGO-Ag@Ag3PO4 (RAA) hydrogel composite photocatalyst with a synergistic effect of adsorption enrichment and photocatalysis degradation has been synthesized by a facile method and characterized by XRD, SEM, TEM, EDS, FTIR, DRS, UV–vis, TG, Raman, and XPS. RAA hydrogel photocatalyst with 3D porous network structure is not only favorable to increasing the absorption property for organic pollutants owing to a larger surface area and π-π conjunction property, but also promotes the separation and transformation of electron-hole pairs due to the good conductivity performance. The RAA hydrogel composite photocatalyst has exhibited the excellent removal capacity of organic pollutants which were about 1.94 and 1.10 times higher than those of bare Ag3PO4 for the removal of MB and 2, 4-CDP in the dynamic system, respectively. The enhancement of removal efficiency was due to a synergistic effect of adsorption enrichment and photocatalysis degradation. The removal rate of RAA hydrogel composite photocatalyst has only a little decrease from 76.04% to 68.51% for 60 h of the photoreaction, showing the relatively good stability. The trapping experiment and ESR showed the main active species were holes.

    更新日期:2018-07-08
  • Mo-doped BiVO4@reduced graphene oxide composite as an efficient photoanode for photoelectrochemical water splitting
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Palyam Subramanyam, T. Vinodkumar, Devadutta Nepak, Melepurath Deepa, Challapalli Subrahmanyam

    Monoclinic Bismuth vanadate (BiVO4) nanomaterial is an attractive, efficient photoanode for photoelectrochemical (PEC) water splitting due to excellent visible light activity and good photo-chemical stability. However, poor charge separation and low charge carrier mobility hinder the improvement of PEC performance of BiVO4. In this work, molybdenum (Mo)-doped BiVO4@reduced graphene oxide (rGO) nanocomposites are fabricated and their potential to serve as photoanodes for PEC water splitting is evaluated. This composite, by the introduction of Mo-dopant and rGO in BiVO4 enhances the PEC performance for water oxidation for they assist in reducing charge recombination and enhancement of photocurrent. As a result, the Mo-BiVO4@rGO composite photoanode exhibited a photocurrent density of 8.51 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE), which is two and four times greater than that of Mo-BiVO4 (5.3 mA cm-2 at 1.23 V versus RHE) and pristine BiVO4 (2.01 mA cm−2 at 1.23 V versus RHE) photoactive electrodes. In addition, good photo-conversion efficiency, low charge transfer resistance and good external quantum efficiency (EQE) are achieved for this ternary nanocomposite. These studies reveal the improved PEC activity for water splitting by the Mo-doped BiVO4@rGO, and indicated that this approach can be used to design more efficient photoanodes for PEC water splitting.

    更新日期:2018-07-08
  • Cu and Pt clusters deposition on TiO2 powders by DC magnetron sputtering for photocatalytic hydrogen production
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Massimo Bernareggi, Gian Luca Chiarello, Glen West, Marina Ratova, Anna Maria Ferretti, Peter Kelly, Elena Selli

    Titanium dioxide-based photocatalyst powders were obtained by deposition of copper and/or platinum clusters by means of pulsed direct current magnetron sputtering with different deposition times and plasma composition during Cu/Pt sputtering. A top-down configuration was employed with the sputtering source facing the powder holder mounted on a shaker mechanism, which continuously mixed the powder during the sputtering process. HRTEM analyses revealed the presence of well dispersed, subnanometric sized metal clusters, even for long deposition times, while XRPD analysis showed no modification of the TiO2 crystal structure upon metal deposition. The so obtained powders were tested as photocatalysts in methanol photo-steam reforming for hydrogen production. The presence of Pt clusters increased the photoactivity with respect to that of bare TiO2. The plasma composition during Cu sputtering was found to strongly affect the photoactivity of the obtained materials, Cu alone deposited as co-catalyst in an Ar-only atmosphere imparting better photoactivity than Cu sputtered in Ar/O2. When the deposition of Cu clusters was coupled with the deposition of Pt clusters, an additive effect of the two metals in increasing TiO2 photoactivity was observed if Cu clusters were sputtered in the absence of oxygen.

    更新日期:2018-07-08
  • The production of furfural directly from hemicellulose in lignocellulosic biomass: A review
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Yiping Luo, Zheng Li, Xiaoling Li, Xiaofeng Liu, Jiajun Fan, James H. Clark, Changwei Hu

    As one main component of lignocellulosic biomass, hemicellulose is a promising alternative for the replacement of limited fossil resources to produce furfural, thus preserving a high atom efficiency. However, the complex structure of hemicellulose and the interaction between the other two components in lignocellulosic biomass (cellulose and lignin) make the effective utilization of naturally formed structure of hemicellulose challenging. This review presents an overview of the production of furfural directly from hemicellulose in lignocellulosic biomass with special emphasis on achieving the effective utilization of hemicellulose, which includes the selective dissolution of hemicellulose from lignocellulosic biomass and the selective formation of furfural from hemicellulose derivatives. Whereas the cellulose and lignin structures are retained, which can be utilized separately. Solvents and catalysts are considered as two main factors in this valorization process of hemicellulose.

    更新日期:2018-07-08
  • Formation of CeMnxOy/OMS-2 nanocomposite significantly enhances UV–vis-infrared light-driven catalytic activity
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Huihui Liu, Yuanzhi Li, Yi Yang, Zhengkang Shi, Qian Zhang, Shaowen Wu, Xiujian Zhao

    The CeMnxOy/OMS-2 nanocomposites were prepared by depositing different amounts of amorphous CeMnxOy on the pure OMS-2 sample by the hydrothermal redox reaction of Ce(NO3)3 and KMnO4. The formation of the CeMnxOy/OMS-2 nanocomposites causes a significant enhancement in the photothermocatalytic activity of OMS-2 for the gas-phase oxidation of benzene under the UV–vis-infrared illumination from a Xe lamp. The optimum CeMnxOy/OMS-2-5.0% nanocomposite exhibits very effective photothermocatalytic activity and very good durability under the UV–vis-infrared illumination. It also exhibits effective photothermocatalytic activity under the visible-infrared and infrared illumination. The significantly enhanced photothermocatalytic activity of the CeMnxOy/OMS-2-5.0% nanocomposite as compared to the pure OMS-2 sample is attributed to the much higher thermocatalytic activity of the former than the latter due to a significant improvement in the reducibility upon the formation of the CeMnxOy/OMS-2-5.0% nanocomposite. A novel photoactivation quite unlike the photocatalysis on the semiconductor photocatalyst such as anatase TiO2 is found to obviously promote the solar-light-driven thermocatalytic activity.

    更新日期:2018-07-08
  • Au/Rod-like MnO2 catalyst via thermal decomposition of manganite precursor for the catalytic oxidation of toluene
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Hua Sun, Xiaolin Yu, Xueqin Yang, Xiuyun Ma, Mengya Lin, Changfang Shao, Yao Zhao, Fuyi Wang, Maofa Ge

    Au/Rod-like MnO2 catalyst was prepared via thermal decomposition of Au/MnOOH precursor. Au nanoparticles (NPs) with an average size of about 3.05 nm were highly dispersed on the MnOOH supports. Au/MnO2-300 catalyst exhibited the best catalytic activity for toluene oxidation due to the abundant surface Mn4+ species, large specific surface area, good low-temperature reducibility and high oxygen species mobility. The further increase of thermal decomposition temperature resulted in the severe sintering of Au NPs, causing the decrease of toluene catalytic activity. The T50 and T90 values for Au/MnO2-300, 400 and 500 catalysts were 202, 207, 210 °C and 205, 210, 215 °C, respectively. The apparent activation energy of Au/MnO2-300 catalyst (61 kJ/mol) was obviously lower than those of Au/MnO2-400 (107.8 kJ/mol) and 500 (141.5 kJ/mol) catalysts. The reaction rates at 185 °C had a decrease tendency from 0.37 to 0.16 mol s−1 gcat−1 with the growth of Au NPs for Au/MnO2-300, 400 and 500 catalysts.

    更新日期:2018-07-08
  • Light-driven synthesis of sub-nanometric metallic Ru catalysts on TiO2
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Joanna Wojciechowska, Elisa Gitzhofer, Jacek Grams, Agnieszka M. Ruppert, Nicolas Keller

    A one-step room temperature photo-assisted synthesis has been implemented in liquid phase and under solar light for preparing highly dispersed TiO2 supported metallic Ru catalysts, with no need of final thermal treatment, external hydrogen, or chemical reductant. Whether RuCl3 chloride or Ru(acac)3 acetylacetonate precursor salt was used, sub-nanometric metallic Ru nanoparticles were synthesized on TiO2 with a sharp size distribution, the high dispersion and the metallic nature of the nanoparticles being evidenced by transmission electron microscopy and X-ray photoelectron spectroscopy. However, the use of the chloride salt was proposed to be more suitable for preparing Ru/TiO2 catalysts, due to the lower photodeposition efficiency observed with acetylacetonate, that did not allow to synthesize Ru nanoparticles with a loading higher than 1 wt.%. Different reaction mechanisms have been proposed for explaining the behaviour of both TiO2-salt systems during the Ru nanoparticle synthesis, involving respectively, both holes and electrons charge carriers in oxidation and reduction steps with acetylacetonate, and the sole photogenerated electrons with chloride.

    更新日期:2018-07-08
  • SCILLs as selective catalysts for the oxidation of aromatic alcohols
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    Iunia Podolean, Octavian D. Pavel, Haresh G. Manyar, S.F. Rebecca Taylor, Kathryn Ralphs, Peter Goodrich, Vasile I. Pârvulescu, Christopher Hardacre

    The cryptomelane form of manganese oxide, OMS-2, has been used a pure material as well as a 5 wt % Pt/OMS-2 catalyst for the oxidation of benzyl alcohol. In addition, these catalysts have been modified with ionic liquids via a thin layer of [Bmim][NTf2] or [Bmpyr][NTf2]. These catalysts were characterized using a series of techniques: NMR, XRD, DRIFT, Raman, BET, Dynamic Light Scattering, XPS, TEM, SEM. The Weisz–Prater criterion has also been considered to inform whether the reactions were under diffusional control. The presence of platinum on the OMS-2 surface results in the support transforming to form Mn3O4 during reaction. In contrast, in the presence of the ionic liquid, the catalysts exhibited an increased phase stability. Efficient oxidation of benzyl alcohol was observed with a conversion of 80% and 82% selectivity to aldehyde for 5 wt% Pt/OMS-2/[Bmim][NTf2] in air. As expected an increase of the oxygen pressure led to an increase in the conversion to the detriment of aldehyde selectivity. The catalytic tests also showed an important effect on the conversion and selectivity of benzyl alcohol as a function of the diluent gas comparing inert (N2, He, Ar) or (CO2) reactive gases. This effect was influenced by the nature of the ionic liquid present.

    更新日期:2018-07-08
  • Production of 1,3-butadiene in one step catalytic dehydration of 2,3-butanediol
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    N.T.T Nguyen, F. Matei-Rutkovska, M. Huchede, K. Jaillardon, G. Qingyi, C. Michel, J.M.M. Millet

    Catalysts able to selectively dehydrate 2,3-butanediol into butadiene have been designed. These catalysts, based on rare-earth orthophosphates showed that 58% selectivity to butadiene could be obtained at total conversion at only 300 °C, and were relatively stable. While the deactivation could be delayed by addition of water to the gas feeds, it could not be avoided and a regeneration was necessary. This regeneration was achieved by a simple heat treatment under air for a few hours at 450 °C. All results showed that Lewis acid sites corresponding to the rare earth cations are involved in the dehydration of 2,3-butanediol into butadiene. This dehydration occurs with the intermediate formation of 3-buten-2ol, probably over acid-base concerted sites and the subsequent dehydration of 3BDOL to butadiene over weak Brønsted acid sites. All types of sites appear present on the catalysts surface and distributed in a relatively optimal way.

    更新日期:2018-07-08
  • Support effects on NiO-based catalysts for the oxidative dehydrogenation (ODH) of ethane
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    D. Delgado, R. Sanchís, J.A. Cecilia, E. Rodríguez-Castellón, A. Caballero, B. Solsona, J.M. López Nieto

    We report on the effect of NiO-support interactions in the chemical nature of Ni species on a series of supported NiO catalysts for the ODH of ethane. SiO2, TiO2-anatase, a high surface area TiO2 and a porous clay heterostructure (PCH) with TiO2 and SiO2 pillars were used as supports, which led to a selectivity to ethylene in the range 30-90 % over supported NiO catalysts. The catalysts were characterized by means of XRD, N2-Adsorption, H2-TPR, XPS and in-situ (under H2 reductive atmosphere) and ex-situ XAS spectroscopy. The catalytic performance of supported materials is discussed in terms of their reducibility and specific reduction kinetics, but also taking into account the specific chemical nature of Ni species on each catalyst. The influence of the particle size and the presence of Ni and O vacancies on the catalytic performance in the ODH of ethane is inferred.

    更新日期:2018-07-08
  • Highly catalytic oxidative desulfurization and denitrogenation of diesel using anchored-silica-gel vanadium-substituted Dawson-type polyoxometalate
    Catal. Today (IF 4.667) Pub Date : 2018-07-05
    F. Banisharif, M.R. Dehghani, M.C. Capel-Sanchez, J.M. Campos-Martin

    The aim of this article is to study the extractive-catalytic oxidative desulfurization (ECODS) of the model oil containing several model S-containing compounds as well as N-containing compound using a heterogeneous vanadium substituted Dawson-type polyoxometalate catalyst under atmospheric pressure and temperature lower than 100 °C. The catalyst was prepared by ion exchange with alkyl ammonium derivatives covalently anchored to silica gel. The potential of this methodology was illustrated by oxidation of 100% quinoline and 80% of total sulfur in model oil containing 500 ppmw sulfur and 70% of total sulfur in model oil 1500 ppmw in less than 30 min of reaction, in the absence of solvent. However, when acetonitrile was employed as an extractive solvent, the desulfurization was increased considerably. Under the reaction conditions, activated catalyst and acetonitrile, solvent to oil ratio 1:6, could remove approximately 100% of quinoline, 95% of sulfur from 500-ppmw model oil, 87% of sulfur from 1500-ppmw model oil in less than 30 min. The catalyst is very active in ECODS and can be reused fifth times from 500-ppmw model oil and third times from 1500-ppmw model oil without an important decrease in activity. The ECODS could remove 83% of total sulfur from 1235-ppmw-S real diesel.

    更新日期:2018-07-08
  • Degradation of Emerging Contaminants Diclofenac, Sulfamethoxazole, Trimethoprim and Carbamazepine by Bentonite and Vermiculite at a Pilot Solar Compound Parabolic Collector
    Catal. Today (IF 4.667) Pub Date : 2018-07-07
    J.I. Martínez-Costa, M.I. Maldonado Rubio, R. Leyva-Ramos

    This study was aimed at evaluating bentonite (BEN) and vermiculite (VER) clays as photoactive materials for photodegrading a low-concentration (100 μg L−1) mixture of four emerging contaminants (ECs): trimethoprim (TMP), sulfamethoxazole (SMX), carbamazepine (CBZ) and diclofenac (DCF), using a solar advanced oxidation process. The experiments were performed in a stirred magnetic batch reactor (SMBR) and a solar pilot plant compound parabolic collector (CPC). The effect of mass, type of catalyst clay and H2O2 dose were evaluated, and the photodegradation of ECs was followed by Ultra Performance Liquid Chromatography (UPLC) and Dissolved Organic Carbon content (DOC). The results showed that the optimal dose of clays for EC degradation in both SMBR and CPC reactors was 0.2 g L−1. The photodegradation of ECs at optimal conditions by BEN and VER in the CPC decreased in the following order: DCF > TMP > SMX > CBZ and DCF > SMX > TMP > CBZ, respectively. The photodegradation rate constants for VER were 2, 32 and 1.1 times higher than those for BEN when SMX, CBZ and DCF were photodegraded with the optimal dose of clay, correspondingly. The percentage removal of DCF and SMX in experiments using BEN or VER was similar to TiO2. The TMP, SMX, CBZ and DCF degradation rate constants increased 9.05, 18.9, 2.08 and 23 times by adding [H2O2] = 200 mg L−1 and VER. The percentage removal of DOC was 16, 40 and 48% when VER and 50, 100 or 200 mg L−1 of hydrogen peroxide were added into the system, respectively. Similar results were obtained by adding BEN.

    更新日期:2018-07-08
  • Morphological transformations during Fischer-Tropsch synthesis on a titania-supported cobalt catalyst
    Catal. Today (IF 4.667) Pub Date : 2018-07-04
    C.E. Kliewer, S.L. Soled, G. Kiss

    Deactivation mechanisms for a rhenium-promoted titania-supported cobalt catalyst are investigated during Fischer-Tropsch (FT) synthesis. Bench-scale reactor tests, chemisorption studies, thermogravimetric analyses (TG), and transmission electron microscopy (TEM) are used to probe environmental effects on catalytic activity.Bench-scale reactor studies show a steady decrease in activity with time. While a fraction of this loss can be recovered with a low temperature reduction (rejuvenation) inside the reactor, multiple data indicate this phenomenon is primarily attributable to water-induced oxidation of small cobalt particles.Data from long-term FT runs indicate the presence of three non-rejuvenable deactivation mechanisms: metal agglomeration, strong metal-support interaction (SMSI), and mixed metal oxide formation. High conversion studies implicate byproduct water in the agglomeration process, and ex-situ TEM data conclusively reveals that growth occurs via a coalescence mechanism. Combined kinetic and chemisorption studies reveal that SMSI results from the gradual buildup of titania decoration on the surface of the active cobalt and is exacerbated with multiple rejuvenation cycles. TGA data indicate that mixed metal oxide formation occurs in long-duration, pilot plant runs. In all cases, the aggregate of reactor kinetic, chemisorption, TG, and TEM results point to chemically-assisted deactivation phenomena attributable to the byproduct water.

    更新日期:2018-07-05
  • Photocatalytic properties of TiO2-loaded porous silica with hierarchical macroporous and mesoporous architectures in the degradation of gaseous organic molecules
    Catal. Today (IF 4.667) Pub Date : 2018-07-03
    Takashi Kamegawa, Yasushi Ishiguro, Hiromi Yamashita

    As an advanced support of TiO2 photocatalyst, mesoporous silica (MS) with hierarchical macroporous architecture (MMS) was prepared by applying templating synthesis techniques. Colloidal crystal of spherical poly(methyl methacrylate) (PMMA) particles and organic surfactant was used for construction of two types of pores with different size scales. The porous structure and state of TiO2 was investigated by various characterization techniques. Mesoporous and macroporous structure of MMS with interconnecting networks was maintained even after loading of TiO2 particles. The unique properties of macroporous structure were observed in the adsorption of acetone gas and 2-propanol gas. In comparison of TiO2-loaded MMS and MS (denoted as TiO2/MMS and TiO2/MS), TiO2/MMS showed a high adsorption rate and a large adsorbed amount in the case of 2-propanol at low and high relative pressure, respectively. However, each profile in the case of acetone was almost same in both samples. Based on the advantageous porous structure, TiO2/MMS also exhibited a good photocatalytic performance in the degradation of 2-propanol in gas phase under UV light irradiation.

    更新日期:2018-07-04
  • Ferric porphyrin–based polymers for electrochemical oxygen reduction
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Subhabrata Banerjee, Yuta Nabae
    更新日期:2018-07-02
  • Tailoring the Crystallite Size of Co3O4/SiO2 Catalyst Using Organic-Metal Matrix Method
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Xiaoqin Qin, Benzhen Yao, Sergio Gonzalez-Cortes, Yongxiang Zhao, Tiancun Xiao
    更新日期:2018-07-02
  • PtxCo/meso-MnOy: Highly efficient catalysts for low-temperature methanol combustion
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Jun Yang, Yuxi Liu, Jiguang Deng, Shaohua Xie, Zhiquan Hou, Xingtian Zhao, Kunfeng Zhang, Zhuo Han, Hongxing Dai
    更新日期:2018-07-02
  • In-situ FTIR-DRS investigation on shallow trap state of Cu-doped TiO2 Photocatalyst
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Lihong Zhang, Bing Han, Peifu Cheng, Yun Hang Hu
    更新日期:2018-07-02
  • Tungstophosphoric acid supported on mesoporouus niobiumoxophosphate: An efficient solid acid catalyst for etherification of 5-hydroxymethylfurfural to 5-ethoxymethylfurfural
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    P. Krishna Kumari, B. Srinivasa Rao, D. Dhana Lakshmi, N. Ruthwik Sai Paramesh, C. Sumana, N. Lingaiah
    更新日期:2018-07-02
  • 更新日期:2018-07-02
  • The effect of metal (Nb, Ru, Pd, Pt) supported on SBA-16 on the hydrodeoxygenation reaction of phenol
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Agnieszka Feliczak-Guzik, Paulina Szczyglewska, Izabela Nowak
    更新日期:2018-07-02
  • 1D-Co3O4, 2D-Co3O4, 3D-Co3O4 for catalytic oxidation of toluene
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Quanming Ren, Zhentao Feng, Shengpeng Mo, Chunlei Huang, Shujun Li, Weixia Zhang, Limin Chen, Mingli Fu, Junliang Wu, Daiqi Ye
    更新日期:2018-07-02
  • Micropore diffusivities of NO and NH3 in Cu-ZSM-5 and their effect on NH3-SCR
    Catal. Today (IF 4.667) Pub Date : 2018-07-02
    Yuta Nakasaka, Takumi Kanda, Ken-ichi Shimizu, Kenichi Kon, Gen Shibata, Takao Masuda
    更新日期:2018-07-02
  • Perovskite-based photocatalysts for organic contaminants removal: Current status and future perspectives
    Catal. Today (IF 4.667) Pub Date : 2018-06-30
    Jiejing Kong, Ting Yang, Zebao Rui, Hongbing Ji
    更新日期:2018-07-01
  • Esterification of oleic acid to biodiesel catalyzed by a highly acidic carbonaceous catalyst
    Catal. Today (IF 4.667) Pub Date : 2018-06-28
    Yi-Tong Wang, Zhen Fang, Fan Zhang
    更新日期:2018-06-30
  • Insights into the Reaction Pathway of Hydrodeoxygenation of Dibenzofuran over MgO Supported Noble-metals Catalysts
    Catal. Today (IF 4.667) Pub Date : 2018-06-28
    Jie Zhang, Chuang Li, Xiao Chen, Weixiang Guan, Changhai Liang
    更新日期:2018-06-30
  • Tuning the composition of porous resin-templated TiO2 macrobeads for optimized photocatalytic performance
    Catal. Today (IF 4.667) Pub Date : 2018-06-25
    Q.A. Naqvi, M. Ratova, R. Klaysri, P.J. Kelly, M. Edge, S. Potgieter-Vermaak, L. Tosheva
    更新日期:2018-06-27
  • Photocatalytic properties of Layer-by-layer thin films of hexaniobate nanoscrolls
    Catal. Today (IF 4.667) Pub Date : 2018-06-26
    Barbara N. Nunes, Christoph Haisch, Alexei V. Emeline, Detlef W. Bahnemann, Antonio Otavio T. Patrocinio
    更新日期:2018-06-27
  • Thermally stable Ag/Al2O3 confined catalysts with high diffusion-induced oxidation activity
    Catal. Today (IF 4.667) Pub Date : 2018-06-23
    Houlin Wang, Shuting Luo, Xinghao Li, Wei Liu, Xiaodong Wu, Duan Weng, Shuang Liu
    更新日期:2018-06-25
  • Facile synthesis of high-surface area platinum-doped ceria for low temperature CO oxidation
    Catal. Today (IF 4.667) Pub Date : 2018-06-23
    Suresh Gatla, Daniel Aubert, Valérie Flaud, Rémi Grosjean, Thomas Lunkenbein, Olivier Mathon, Sakura Pascarelli, Helena Kaper
    更新日期:2018-06-25
  • Deactivation behavior on VPO and VPO-Zr catalysts in the aldol condensation of methyl acetate and formaldehyde
    Catal. Today (IF 4.667) Pub Date : 2018-06-22
    Dan Yang, Gang Wang, Hui Wu, Xinpeng Guo, Suojiang Zhang, Zengxi Li, Chunshan Li
    更新日期:2018-06-22
  • On developing ferrisilicate catalysts supported on silicon carbide (SiC) foam catalysts for continuous catalytic wet peroxide oxidation (CWPO) reactions
    Catal. Today (IF 4.667) Pub Date : 2018-06-19
    Xiaoxia Ou, Fotios Pilitsis, Ninghui Xu, S. F. Rebecca Taylor, John Warren, Arthur Garforth, Jinsong Zhang, Christopher Hardacre, Yilai Jiao, Xiaolei Fan
    更新日期:2018-06-22
  • 更新日期:2018-06-22
  • Effect of CeO2 morphologies on toluene catalytic combustion
    Catal. Today (IF 4.667) Pub Date : 2018-06-20
    Zhentao Feng, Quanming Ren, Ruosi Peng, Shengpeng Mo, Mingyuan Zhang, Mingli Fu, Limin Chen, Daiqi Ye
    更新日期:2018-06-22
  • 更新日期:2018-06-22
  • Comparative study of acid-basic properties of MCF impregnated with niobium and cerium species
    Catal. Today (IF 4.667) Pub Date : 2018-06-20
    Katarzyna Stawicka, Piotr Decyk, Anna Wojtaszek-Gurdak, Maria Ziolek
    更新日期:2018-06-22
  • Formaldehyde CWO with gold nanoparticles in a forced through flow catalytic-membrane reactor
    Catal. Today (IF 4.667) Pub Date : 2018-06-20
    B. Martínez-Barrera, M. Gutiérrez-Arzaluz, J.A. Montoya de la Fuente, M. Romero-Romo, M. Torres-Rodríguez

    A forced through flow membrane-reactor was used to study the formaldehyde catalytic oxidation process, dissolved in oxygen-saturated aqueous solution. The commercial support was modified layer by layer with polycations and polyanions; the active phase of the catalytic membrane was gold nanoparticles dispersed over the macroporous surfaces of the membrane. Formaldehyde oxidation was performed at 30 and 60 °C with three different formaldehyde concentrations, namely: 100, 300 and 500 ppm. The best performance 59% conversion was achieved for an initial 500 ppm after 240 reaction minutes. The reaction products were determined by GC. The catalytic membrane reactor shows good performance for the removal of formaldehyde at low temperature.

    更新日期:2018-06-22
  • Hydrogen production through hydrocarbon fuel reforming processes over Ni based catalysts
    Catal. Today (IF 4.667) Pub Date : 2018-06-20
    Z.R. Ismagilov, E.V. Matus, I.Z. Ismagilov, O.B. Sukhova, S.A. Yashnik, V.A. Ushakov, M.A. Kerzhentsev
    更新日期:2018-06-22
  • Tantalum vs Niobium MCF nanocatalysts in the green synthesis of chromene derivatives
    Catal. Today (IF 4.667) Pub Date : 2018-06-19
    Agata Smuszkiewicz, Jesús López-Sanz, Izabela Sobczak, Rosa M. Martín-Aranda, Maria Ziolek, Elena Pérez-Mayoral
    更新日期:2018-06-20
  • Methanolysis of Simarouba Glauca DC oil with hydrotalcite-type ZnCuAl catalysts
    Catal. Today (IF 4.667) Pub Date : 2018-06-19
    P. Salinas Hernández, F. Morales Anzures, R. Pérez Hernández, F. Tzompantzi Morales, Mario A. Romero Romo
    更新日期:2018-06-20
  • Promoting effect of Au on Pd/TiO2 catalyst for the selective catalytic reduction of NOx by H2
    Catal. Today (IF 4.667) Pub Date : 2018-06-18
    Kaijiao Duan, Zhihua Wang, Christopher Hardacre, Zhiming Liu, Sarayute Chansai, Cristina Stere
    更新日期:2018-06-19
  • NH3-SCR by monolithic Cu-ZSM-5 and Cu-AFX catalysts: kinetic modeling and engine bench tests
    Catal. Today (IF 4.667) Pub Date : 2018-06-18
    Gen Shibata, Wataru Eijima, Ryutaro Koiwai, Ken-ichi Shimizu, Yuta Nakasaka, Yoshimitsu Kobashi, Yoshihiro Kubota, Masaru Ogura, Jin Kusaka
    更新日期:2018-06-19
  • Photocatalytic activity of the (NH4)2V6O16/g-C3N4 composite catalysts for water splitting applications
    Catal. Today (IF 4.667) Pub Date : 2018-06-18
    Yu-Sheng Lai, Yong-Ming Dai, Jih-Mirn Jehng
    更新日期:2018-06-19
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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