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  Subjects -> ENGINEERING (Total: 2358 journals)
    - CHEMICAL ENGINEERING (201 journals)
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    - ELECTRICAL ENGINEERING (107 journals)
    - ENGINEERING (1240 journals)
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ENGINEERING (1240 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 20)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 265)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 6)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
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Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 43)
Advances in Science and Research (ASR)     Open Access   (Followers: 4)
Aerobiologia     Hybrid Journal   (Followers: 2)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 26)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 2)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 272)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 209)
Composites Part B : Engineering     Hybrid Journal   (Followers: 246)
Composites Science and Technology     Hybrid Journal   (Followers: 182)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
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Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
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Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 43)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)

        1 2 3 4 5 6 7 | Last

Journal Cover Catalysis Communications
  [SJR: 1.029]   [H-I: 84]   [6 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1566-7367
   Published by Elsevier Homepage  [3175 journals]
  • Surface dealumination of micro-sized ZSM-5 for improving propylene
           
    • Authors: Rui Feng; Xinlong Yan; Xiaoyan Hu; Zifeng Yan; Jiawei Lin; Zheng Li; Kun Hou; Mark J. Rood
      Pages: 1 - 5
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Rui Feng, Xinlong Yan, Xiaoyan Hu, Zifeng Yan, Jiawei Lin, Zheng Li, Kun Hou, Mark J. Rood
      Novel micro-sized ZSM-5 zeolite was successfully prepared by a two-stage glucose-assisted crystallization and a selective surface dealumination process before removing the templates for methanol to propylene (MTP) reaction. The structural and crystalline properties of the as-prepared ZSM-5 were characterized by XRD, XPS, SEM, FTIR, and NMR analyses. Results showed that novel ZSM-5 zeolites with micro-sized crystals had better performances in improving the propylene selectivity in the MTP reaction than those conventional ZSM-5 zeolites with nano-sized crystals. The surface dealumination before the template removal obviously decreased the concentrations of surface aluminum atoms and significantly improved lifetime of catalysts in MTP reaction.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.005
      Issue No: Vol. 109 (2018)
       
  • Synthesis of carbon doped KTaO3 and its enhanced performance in
           photocatalytic H2 generation
    • Authors: Zhiqiang Chen; Pingxing Xing; Pengfei Chen; Qianqian Chen; Yan Wang; Jingxiong Yu; Yiming He
      Pages: 6 - 9
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Zhiqiang Chen, Pingxing Xing, Pengfei Chen, Qianqian Chen, Yan Wang, Jingxiong Yu, Yiming He
      Carbon-doped KTaO3 was synthesized for the first time via a simple combination of hydrothermal and calcination processes with glucose as the carbon source. XRD and XPS characterizations proved the successful introduction of the carbon atoms into the KTaO3 lattice. Photocatalytic test showed that the carbon-doped KTaO3 presented excellent performance in photocatalytic H2 generation under simulated sunlight illumination, mainly due to the enhanced separation of electron-hole pairs. The optimal sample presents a H2 generation rate of 592 μmol g−1 h−1, which reaches 2.6 times that of pure KTaO3.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.006
      Issue No: Vol. 109 (2018)
       
  • Hexabromoacetone: An efficient reagent for bromination of saturated
           hydrocarbons catalyzed by oxidovanadium(IV) picolinate complex
    • Authors: Paweena Pongpipatt; Sakonrat Saroachsoontornkul; Warinthorn Chavasiri
      Pages: 10 - 15
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Paweena Pongpipatt, Sakonrat Saroachsoontornkul, Warinthorn Chavasiri
      The efficient brominating agent, hexabromoacetone (HBA) worked very well with oxidovanadium(IV) picolinate catalyst in selective bromination of saturated hydrocarbons with no competing CH oxidation. Cyclododecyl bromide was fruitfully obtained as a major product from the bromination of cyclododecane with trace amount of oxidized product(s). The selectivity attained for the reaction was excellent. Competitive bromination using selected alkane and alcohol revealed that alkyl bromide occurred via alkane substrate directly.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.003
      Issue No: Vol. 109 (2018)
       
  • Amino-functionalized seeds-induced synthesis of encapsulated
           Pd@Silicalite-1 core-shell catalysts for size-selective hydrogenation
    • Authors: Cun Liu; Lu Lin; Yi Cao; Haiou Liu; Yu Guo; Xiongfu Zhang
      Pages: 16 - 19
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Cun Liu, Lu Lin, Yi Cao, Haiou Liu, Yu Guo, Xiongfu Zhang
      Silicalite-1 (S-1) encapsulated Pd@Silicalite-1 (Pd@S-1) core-shell catalysts were prepared by using a seeds-induced growth strategy, including immobilization of Pd2+ on amino-functionalized S-1 seeds and regrowth of the S-1 zeolite. The microstructure and elemental composition of Pd@S-1 core-shell catalysts were characterized by FE-SEM, TEM, XRD, XPS and ICP-AES. The results indicate Pd NPs are encapsulated and well dispersed in S-1 crystals and have a narrow size distribution of around 3.2 nm. This core-shell catalyst demonstrates excellent shape selectivity in the hydrogenation of alkenes compared with conventional Pd/S-1 obtained by directly loading Pd NPs on S-1 without regrowth.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.002
      Issue No: Vol. 109 (2018)
       
  • Confined preparation of ultrafine NiB amorphous alloys for hydrogenation
    • Authors: Wenhui Feng; Yuanyuan Ma; Libo Niu; Huiling Zhang; Guoyi Bai
      Pages: 20 - 23
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Wenhui Feng, Yuanyuan Ma, Libo Niu, Huiling Zhang, Guoyi Bai
      How to control the size distribution and morphology of amorphous alloy is of vital importance in improving their catalytic performance. In this work, uniform and ultrafine NiB amorphous alloy catalysts were prepared by using a hydrogelator, 2,4-(3,4-dichlorobenzylidene)-d-sorbitol, as growth controller as well as PEG800 and tannin for co-additives, which exhibit excellent performance toward the selective hydrogenation of cinnamic acid into hydrocinnamic acid. TEM images indicated the addition of PEG800 and tannin affected the self-assembly of gelator from large aggregates into small assemblies and then affected the morphology of NiB catalysts, leading to enhancement of catalytic activity and stability.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.015
      Issue No: Vol. 109 (2018)
       
  • Oxygen step-response experiments for methane oxidation over Pd/Al2O3: An
           in situ XAFS study
    • Authors: Johan Nilsson; Per-Anders Carlsson; Natalia M. Martin; Peter Velin; Debora Motta Meira; Henrik Grönbeck; Magnus Skoglundh
      Pages: 24 - 27
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Johan Nilsson, Per-Anders Carlsson, Natalia M. Martin, Peter Velin, Debora Motta Meira, Henrik Grönbeck, Magnus Skoglundh
      Methane oxidation over Pd/Al2O3 has been investigated by in situ XAFS characterization during oxygen step-response experiments. With a net-reducing feed gas, Pd is in a reduced state and the introduction of oxygen leads to oxidation of palladium as well as increased methane conversion. When the rate of Pd oxidation is slow, a transient surface oxidized state is observed with low activity for methane oxidation. The activity increases when palladium is further oxidized and the highest activity is observed for palladium oxide.

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.011
      Issue No: Vol. 109 (2018)
       
  • PdFe bimetallic catalysts for debenzylation of
           hexabenzylhexaazaisowurtzitane (HBIW) and
           tetraacetyldibenzylhexaazaisowurtzitane (TADBIW)
    • Authors: Deyuan Lou; Huishu Wang; Shuang Liu; Li Li; Wei Zhao; Xinhan Chen; Junlan Wang; Xiaoqiang Li; Pingfan Wu; Jun Yang
      Pages: 28 - 32
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Deyuan Lou, Huishu Wang, Shuang Liu, Li Li, Wei Zhao, Xinhan Chen, Junlan Wang, Xiaoqiang Li, Pingfan Wu, Jun Yang
      PdM (M = Ni, Cu, Co, Fe) bimetallic catalysts were prepared by a precipitation and then reduction method. PdFe bimetal showed superior catalytic performance. The different supports (XC-72, AC, SiO2, Al2O3, TiO2) loaded PdFe catalysts were further investigated by physical adsorption, FESEM, XRD, TEM and XPS. It was found that Fe promoted the precipitation of Pd on the surface of the supports. Meanwhile TiO2 as more suitable supports improved the dispersion, surface concentration and available amount of Pd compared to other carriers and then accelerated the catalytic activities of PdFe bimetal for HBIW and TADBIW debenzylation.

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.008
      Issue No: Vol. 109 (2018)
       
  • Synthesis of PtCo nanoflowers and its catalytic activity towards
           nitrobenzene hydrogenation
    • Authors: Hui Miao; Shiwei Hu; Kelong Ma; Lin Sun; Fufang Wu; Hongtao Wang; Huiquan Li
      Pages: 33 - 37
      Abstract: Publication date: 5 May 2018
      Source:Catalysis Communications, Volume 109
      Author(s): Hui Miao, Shiwei Hu, Kelong Ma, Lin Sun, Fufang Wu, Hongtao Wang, Huiquan Li
      Novel PtCo nanoflowers were synthesized using oleylamine-oleic acid system via one-pot chemical reaction. The difference in morphology with different amount of oleic acid revealed that the formation of the PtCo nanoflowers was attributed to the precipitation effect of oleic acid both in nucleation stage and growth process. The obtained PtCo nanoflowers show excellent performance in catalytic hydrogenation of nitrobenzene, when compared with PtCo nanoparticles and commercial Pt/C. The high activity is attributed to the porous structure formed by assembling of smaller nanoparticles and electron interaction of Co to Pt.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.009
      Issue No: Vol. 109 (2018)
       
  • Fine tuning the enantioselectivity and substrate specificity of alcohol
           dehydrogenase from Kluyveromyces polysporus by single residue at 237
    • Authors: Yue Wang; Wei Dai; Yongmei Liu; Zhongwei Zhang; Jieyu Zhou; Guochao Xu; Ye Ni
      Pages: 1 - 6
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Yue Wang, Wei Dai, Yongmei Liu, Zhongwei Zhang, Jieyu Zhou, Guochao Xu, Ye Ni
      Here, S237 was identified to be important in fine tuning the substrate specificity and enantioselectivity of alcohol dehydrogenase from Kluyveromyces polysporus (KpADH). In the reduction of a diaryl ketone, (4-chlorophenyl)-(pyridin-2-yl)-methanone (1a), the highest and lowest enantioselectivity of 96.1% and 27.0% e.e. (R) were obtained with S237A and S237C. Kinetic parameters analysis revealed that S237G, S237A, S237H and S237D displayed improved k cat/K m toward 1a. Various prochiral ketones, including acetophenone, 4-chloroacetophenone and ethyl 2-oxo-4-phenylbutyrate could be asymmetrically reduced by S237C, S237G and S237E with >99% e.e. This study provides guidance for the application of KpADH in the preparation of chiral secondary alcohols.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.012
      Issue No: Vol. 108 (2018)
       
  • Production of diethyl carbonate from ethylene carbonate and ethanol over
           supported fluoro-perovskite catalysts
    • Authors: Hajime Iida; Ryuhei Kawaguchi; Kazu Okumura
      Pages: 7 - 11
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Hajime Iida, Ryuhei Kawaguchi, Kazu Okumura
      The KCaF3/C (K-Ca(A)) catalyst was shown to be effective as heterogeneous basic catalysts for the transesterification of ethylene carbonate (EC) and ethanol among fluoro-perovskite (XYF3)/C (X=K, Cs, Y=Mg, Ca) catalysts. Although the KMgF3/C (K-Mg (A)) catalyst exhibited the highest catalytic activity among the XYF3/C catalysts studied, the potassium leaching was observed on K-Mg (A). CO2 temperature programmed desorption (TPD) revealed that the superior catalytic activity of the XYF3/C was due to its strong basic sites. CO2-TPD and XPS measurements indicated that strong basic sites are generated by an increase in the electron density of fluorine.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.019
      Issue No: Vol. 108 (2018)
       
  • Promoting effects of lanthanum oxide on the NiO/CeO2 catalyst for hydrogen
           production by autothermal reforming of ethanol
    • Authors: Zhiwei Xue; Yuesong Shen; Peiwen Li; Youchun Pan; Junjie Li; Zhiliang Feng; Yu Zhang; Yanwei Zeng; Youlin Liu; Shemin Zhu
      Pages: 12 - 16
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Zhiwei Xue, Yuesong Shen, Peiwen Li, Youchun Pan, Junjie Li, Zhiliang Feng, Yu Zhang, Yanwei Zeng, Youlin Liu, Shemin Zhu
      Promoting effects of Lanthanum oxide on the NiO/CeO2 catalyst for hydrogen production by autothermal reforming of ethanol were investigated. The effects of La increased the specific surface area, stabilized the NiO phase and led to the high dispersion of Ni in active LaNiO3 phase. The carrier CeO2 provided big specific surface area for effective EATR reaction, promoted the H2 production by accelerating the oxygen migration in the catalyst surface via the Ce4+ ↔Ce3+ transformation. Consequently, the optimized Ni1La1Oy/10CeO2 catalyst achieved 100% XEtOH, 69.3% SH2 at 600°C and high stability at 550°C.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.024
      Issue No: Vol. 108 (2018)
       
  • Influence of polyoxometalate structure in ammoxidation of 2-methylpyrazine
    • Authors: Abdulmohsen Al-Shehri; Narasimharao Katabathini
      Pages: 17 - 22
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Abdulmohsen Al-Shehri, Narasimharao Katabathini
      Keggin, Wells-Dawson and Preyssler structured polyoxometalates (POMs) were synthesized by different methodologies. The POMs were used as catalysts for ammoxidation of 2-methylpyrazine. The structural properties of POMs were determined by XRD, SEM, DRIFT, DRUV-vis, H2-TPR, NH3-TPD and N2-physisorption. Preyssler POM sample showed highest 2-methylpyrazine conversion (69%) and 2-cyanopyrazine selectivity (98%) at 380°C. Superior performance of Preyssler POM could be attributed to its redox behavior and relatively strong acid sites. Large number of ammonium ions in the secondary structure of Preyssler POM could also enhance the transformation of oxygenated 2-methylpyrazine species into 2-cyanopyrazine. A correlation between the amount of ammonium content of POMs and their catalytic ammoxidation activity was obtained.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.023
      Issue No: Vol. 108 (2018)
       
  • Cu-ZSM-5 zeolite supported on SiC monolith with enhanced catalytic
           activity for NH3-SCR
    • Authors: Qing Yuan; Zhenyi Zhang; Naisen Yu; Bin Dong
      Pages: 23 - 26
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Qing Yuan, Zhenyi Zhang, Naisen Yu, Bin Dong
      Here, we developed a new kind of hetero-structural catalyst through the homogeneous growth of Cu-ZSM-5 zeolite onto silicon carbide (SiC) monolith by using a one-pot hydrothermal method combined with an ion-exchange process in a rotary oven. The new catalyst formulation was tested towards NH3-SCR, where the catalytic activity and stability of Cu-ZSM-5/SiC at T > 350 °C appear significantly higher than those obtained with Cu-ZSM-5 alone. In particular, the NO consumption rate of the former is 7.5 times larger on the average than that of the latter. This remarkable enhancement of catalytic activity is ascribed to the very good thermal conductivity of the SiC monolithic support. This research work could provide the means for the future design of more active and stable monolithic Cu-ZSM5-based catalytic systems with even lower Cu loading than the ones used in present de-NOx applications.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.030
      Issue No: Vol. 108 (2018)
       
  • Photocatalytic reduction of CO2 over facet engineered TiO2 nanocrystals
           supported by carbon nanofibers under simulated sunlight irradiation
    • Authors: Ze Lei; Zhuo Xiong; Yicheng Wang; Yuxiao Chen; Dingshan Cao; Yongchun Zhao; Junying Zhang; Chuguang Zheng
      Pages: 27 - 32
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Ze Lei, Zhuo Xiong, Yicheng Wang, Yuxiao Chen, Dingshan Cao, Yongchun Zhao, Junying Zhang, Chuguang Zheng
      Carbon nanofibers (CNFs) supported facet engineered TiO2 nanocrystals (NCs) were one-step synthesized by a solvothermal method and their photocatalytic CO2 reduction performance were investigated under simulated sunlight irradiation. The results show that anatase TiO2 NCs with {001} and {101} facets coexposure were homogeneously dispersed on CNFs and combined firmly with CNFs. The enhanced photocatalytic CO2 reduction activity of the composites can be attributed to the formation of TiO2‑carbon heterojunction and the surface heterojunction between the {001}/{101} facets of TiO2 crystals, which accelerate the separation of photogenerated electron-hole pairs and extend the light response of TiO2 to the visible light region simultaneously.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.025
      Issue No: Vol. 108 (2018)
       
  • Bio-inspired Mn-catalysts immobilized on silica surface: The influence of
           the ligand synthesis on catalytic behavior
    • Authors: M. Papastergiou; Ag. Stamatis; A. Simaioforidou; M. Louloudi
      Pages: 33 - 40
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): M. Papastergiou, Ag. Stamatis, A. Simaioforidou, M. Louloudi
      Two approaches are adopted for synthesis of heterogeneous catalysts, a) Grafting of the entire biomimetic catalyst and b) step-by-step Solid Phase Synthesis of the catalyst on the surface of colloidal silica; both of them result in well-dispersed MnII-complexes covalently attached onto the silica surface. These heterogeneous catalysts were found to be efficient and selective for alkenes' epoxidations with H2O2. Interestingly, the catalyst obtained by grafting process it was found to be kinetically much faster and more recyclable than those formed by solid phase synthesis. These data are discussed interlinking synthetic protocols with catalytic behavior with of the active Mn-complex.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.026
      Issue No: Vol. 108 (2018)
       
  • Oxidation of styrene using TiO2-graphene oxide composite as solid
           heterogeneous catalyst with hydroperoxide as oxidant
    • Authors: Balasubramanian Sakthivel; Durairaj Santhakumar Ruby Josephine; Kunjithapatham Sethuraman; Amarajothi Dhakshinamoorthy
      Pages: 41 - 45
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Balasubramanian Sakthivel, Durairaj Santhakumar Ruby Josephine, Kunjithapatham Sethuraman, Amarajothi Dhakshinamoorthy
      The catalytic activity of TiO2 nanoparticles supported on graphene oxide (GO) namely TiO2/GO is reported in the oxidation of styrene (1) using t-butylhydroperoxide (TBHP) as an oxidant in acetonitrile at 70 °C. The oxidation of 1 results mainly in benzaldehyde (2) and styrene oxide (3) using TiO2/GO as catalyst using TBHP as an oxidant. Furthermore, the product selectivity of 3 increases with increasing the wt% of TiO2 on GO under the present reaction conditions. Also, the 5%TiO2/GO catalyst was recycled for four cycles without any drop in conversion of 1 under the present experimental conditions.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.029
      Issue No: Vol. 108 (2018)
       
  • Green synthesis of low-carbon chain nitroalkanes via a novel tandem
           reaction of ketones catalyzed by TS-1
    • Authors: Qingyan Chu; Guangke He; Yang Xi; Ping Wang; Haoxuan Yu; Rui Liu; Hongjun Zhu
      Pages: 46 - 50
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Qingyan Chu, Guangke He, Yang Xi, Ping Wang, Haoxuan Yu, Rui Liu, Hongjun Zhu
      A green and efficient one-pot method has been developed for the synthesis of low-carbon chain nitroalkanes via a novel TS-1 catalyzed tandem oxidation of ketones with H2O2 and NH3. The tandem reaction including ammoxidation, oximation and oxidation of oximes, afforded up to 88% yield and 98% chemo-selectivity requiring only 90min, at 70°C and atmospheric pressure. Moreover, this method was even amenable to 100-fold scale-up without loss of chemical efficiency with 87% yield, represents a significant advance towards industrial production of nitroalkanes. Furthermore, the plausible mechanism of TS-1 catalyzed tandem oxidation of ketones to prepare nitroalkanes was proposed.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.022
      Issue No: Vol. 108 (2018)
       
  • New synthetic approach towards well-defined silica supported tungsten
           bis-oxo, active catalysts for olefin metathesis
    • Authors: Cherif Larabi; Nicolas Merle; Frederic Le Quéméner; Pascal Rouge; Elise Berrier; Régis M. Gauvin; Erwan Le Roux; Aimery de Mallmann; Kai C. Szeto; Mostafa Taoufik
      Pages: 51 - 54
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Cherif Larabi, Nicolas Merle, Frederic Le Quéméner, Pascal Rouge, Elise Berrier, Régis M. Gauvin, Erwan Le Roux, Aimery de Mallmann, Kai C. Szeto, Mostafa Taoufik
      A well-defined bis-oxo bisiloxy tungsten surface species has been prepared by a new synthetic non-aqueous approach. The reaction of [W(O)(O t Bu)4] with the silica surface dehydroxylated at 200 °C proceeds by WO cleavage with concomitant t BuOH release, leading to bigrafted [(SiO)2W(O)(O t Bu)2]. Upon heating at 300 °C, it converts into the bis-oxo derivative [(SiO)2W(O)2]. Without co-catalyst, this material demonstrated high, sustained activity and selectivity in propene metathesis. This emphasizes the importance of the design of robust bis-oxo catalysts by Surface Organometallic Chemistry and represents a significant step to understand and mimic the active species of the industrial WO3/SiO2 system.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.031
      Issue No: Vol. 108 (2018)
       
  • Efficient synthesis of ultrafine Pd nanoparticles on an activated N-doping
           carbon for the decomposition of formic acid
    • Authors: Yiqing Chen; Xuefeng Li; Zhongzhe Wei; Shanjun Mao; Jiang Deng; Yueling Cao; Yong Wang
      Pages: 55 - 58
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Yiqing Chen, Xuefeng Li, Zhongzhe Wei, Shanjun Mao, Jiang Deng, Yueling Cao, Yong Wang
      Palladium nanoparticles (1.88nm) uniformly dispersed on a porous N-doped “leavening” carbon (Pd/NHPC-AC) have been successfully developed, which can be served as a highly active and stable catalyst for the selective decomposition of formic acid under mild conditions. The Pd/NHPC-AC catalyst exhibits enhanced activity for H2 production (TOF=4115h−1 at 60°C) without CO in comparison with Pd/HPC-AC (without nitrogen doping) and Pd/AC under the same reaction conditions. The doping of nitrogen could prevent the Pd nanoparticles from aggregation and leaching from the support surface and therefore improving the reusability of the catalyst.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.028
      Issue No: Vol. 108 (2018)
       
  • An efficient method for synthesizing monofunctionalized derivatives of
           1,1,3,3-tetramethyldisiloxane in ionic liquids as recoverable solvents for
           rhodium catalyst
    • Authors: R. Kukawka; R. Januszewski; I. Kownacki; M. Smiglak; H. Maciejewski
      Pages: 59 - 63
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): R. Kukawka, R. Januszewski, I. Kownacki, M. Smiglak, H. Maciejewski
      Functionalized siloxanes, as one of the most important classes of organosilicon compounds, are widely applied in industry. In our studies, we have investigated, the reaction between 1,1,3,3-tetramethyldisiloxane (TMDSO) and 1-octene, using the rhodium catalyst immobilized in six phosphonium-based ionic liquids differing in the structure of cation and anion. Studies have shown high potential for using ionic liquids to create biphasic system with reactants, where IL/catalyst phase can be separated and reused in subsequent reaction cycles allowing, in this way, for efficient and highly selective monofunctionalization of TMDSO with reuse of the same portion of catalyst up to 20 times in comparison to conventional homogenous reaction.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.021
      Issue No: Vol. 108 (2018)
       
  • Excellent catalytic performance for methanol to olefins over SAPO-34
           synthesized by controlling hydrothermal temperature
    • Authors: Xiaotong Wang; Rui Li; Syed ul Hasnain Bakhtiar; Fulong Yuan; Zhibin Li; Yujun Zhu
      Pages: 64 - 67
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Xiaotong Wang, Rui Li, Syed ul Hasnain Bakhtiar, Fulong Yuan, Zhibin Li, Yujun Zhu
      A facile way to synthesize a series of SAPO-34 zeolites was developed by using the mixed templates of morpholine and TEAOH with changing the temperature. Among these samples, SAPO-34-210 exhibited with the longest lifetime and the highest selectivity to light olefin for methanol to olefin (MTO) reaction. The characterizations suggested that SAPO-34-210 has unique Si distribution due to much more amount of TEAOH introduced into structure, which resulted in the excellent catalytic performance.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.033
      Issue No: Vol. 108 (2018)
       
  • Performance enhancement of Cu/SiO2 catalyst for hydrogenation of dimethyl
           oxalate to ethylene glycol through zinc incorporation
    • Authors: Wang Qi; Qiu Ling; Ding Ding; Chen Yazhong; Shi Chengwu; Cui Peng; Wang Ye; Zhang Qinghong; Liu Rong; Shen Hao
      Pages: 68 - 72
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Wang Qi, Qiu Ling, Ding Ding, Chen Yazhong, Shi Chengwu, Cui Peng, Wang Ye, Zhang Qinghong, Liu Rong, Shen Hao
      CuO-ZnO/SiO2 catalysts with various Zn/Cu molar ratios were prepared by precipitation and characterized by XRD, H2-TPR, TEM, XAES and catalytic performance for hydrogenation of dimethyl oxalate. Characterizations revealed that suitable zinc incorporation resulted in higher Cu+ content on the surface of catalysts, better dispersion of Cu0 particles and better sintering resistance. Cu0.8Zn0.2/SiO2 exhibited the best activity and sintering resistance with 99.5% DMO conversion and 91.5%selectivity to ethylene glycol, after deactivation treatment (T = 400 °C, H2 atmosphere, 2.0 h), the catalyst maintained its activity with DMO conversion of 99.0%, while selectivity to ethylene glycol increased to 95.2%.

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.01.009
      Issue No: Vol. 108 (2018)
       
  • Palladium redispersion at high temperature within the Pd@SiO2 core@shell
           structure
    • Authors: Chang Yup Seo; Xiaoyin Chen; Kai Sun; Lawrence F. Allard; Galen B. Fisher; Johannes W. Schwank
      Pages: 73 - 76
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Chang Yup Seo, Xiaoyin Chen, Kai Sun, Lawrence F. Allard, Galen B. Fisher, Johannes W. Schwank
      Maintaining high dispersion of palladium is critical for Pd-based catalysts, which suffer from deactivation due to sintering at high temperatures (≥800 °C). Here, we report direct evidence that Pd nanoparticles (~4 nm) of a palladium silica core@shell (Pd@SiO2) catalyst can redisperse into nanoclusters (≤2 nm) after aging at 800 °C, where severe Pd sintering would be expected on supported Pd catalysts. The Pd redispersion was confirmed by in situ, as well as ex situ, high resolution transmission electron microscopy, and is manifested by a remarkably decreased light-off temperature for CO oxidation after aging.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.01.027
      Issue No: Vol. 108 (2018)
       
  • Direct reactivity studies of non-heme iron-oxo intermediates toward alkane
           oxidation
    • Authors: Alexandra M. Zima; Oleg Y. Lyakin; Konstantin P. Bryliakov; Evgenii P. Talsi
      Pages: 77 - 81
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Alexandra M. Zima, Oleg Y. Lyakin, Konstantin P. Bryliakov, Evgenii P. Talsi
      Iron complexes [((S,S)-PDP*)FeIII(μ-OH)2FeIII((S,S)-PDP*)](OTf)4 (6), (S,S)-PDP* = N,N′-bis(3,5-dimethyl-4-methoxypyridyl-2-methyl)-(S,S)-2,2′-bipyrrolidine, and [(TPA*)FeIII(μ-OH)2FeIII(TPA*)](OTf)4 (7), TPA* = tris(3,5-dimethyl-4-methoxypyridyl-2-methyl)amine, catalyze the selective hydroxylation of alkanes with H2O2 and peroxycarboxylic acids. Using in situ EPR spectroscopy, direct kinetic data on the reactivity of the iron-oxo intermediates formed in the catalyst systems 6,7/oxidant/RCOOH (RCOOH = acetic acid (AA) or 2-ethylhexanoic acid (EHA)) toward cyclohexane have been obtained for the first time, thus corroborating their key role in the selective CH oxidation. Intermediates 6a AA , 6a EHA and 7a 2 EHA with proposed structures [((S,S)-PDP*)FeV O(OC(O)CH3)]2+, [((S,S)-PDP*)FeV O(OC(O)R)]2+ and [(TPA*)FeV O(OC(O)R)]2+ (RCOOH = EHA) display similar EPR spectra (g 1 = 2.07, g 2 = 2.01, g 3 = 1.96) and have close reactivities toward cyclohexane at −70 °C (k 2 = 2–3 × 10−3 M−1 s−1).
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.01.034
      Issue No: Vol. 108 (2018)
       
  • Fe and/or Mn oxides supported on fly ash-derived SBA-15 for
           low-temperature NH3-SCR
    • Authors: Ge Li; Baodong Wang; Hongyan Wang; Jing Ma; Wayne Qiang Xu; Yonglong Li; Yifan Han; Qi Sun
      Pages: 82 - 87
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Ge Li, Baodong Wang, Hongyan Wang, Jing Ma, Wayne Qiang Xu, Yonglong Li, Yifan Han, Qi Sun
      Fe and/or Mn/SBA-15 catalysts were prepared by the impregnation method using low-cost fly ash-derived SBA-15 molecular sieve as support and tested towards NH3-SCR. Powder XRD, N2 adsorption, XPS, H2-TPR and SEM techniques were used for catalyst characterization and investigation of relationships with the catalytic activity. The Fe-Mn/SBA-15 catalyst exhibited significantly higher NH3-SCR activities than Mn/SBA-15 or Fe/SBA-15 in the 150–250 °C range owing to some developed synergistic effects between Mn and Fe. In particular, the addition of Mn improved the dispersion of Fe2O3 on the catalyst surface, while the addition of Fe promoted the formation of single β-MnO2 phase. The high dispersion of Fe2O3, the appropriate Mn4+/Mn3+ ratio, the concentration of adsorbed oxygen and the low-T enhanced redox activity of the Fe-Mn/SBA-15 improved its NH3-SCR activity. This work opens new avenues of recycling fly ash formed in coal-fired power plants (reducing environmental pollution) and developing low-cost SCR catalysts for NOx pollution control.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.01.035
      Issue No: Vol. 108 (2018)
       
  • Influence of sodium impurities on the properties of CeO2/CuO for carbon
           monoxide oxidation in a hydrogen-rich stream
    • Authors: Rafael Castañeda; Laura Pascual; Arturo Martínez-Arias
      Pages: 88 - 92
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Rafael Castañeda, Laura Pascual, Arturo Martínez-Arias
      Sodium is typically employed as component of bases or salts for precipitating metals during preparation of oxide catalysts. It is normally eliminated during rinsing of the solid precursors. The present work shows however that standard rinsing of the solid precursor of an inverse CeO2/CuO with water at 25 °C is ineffective for eliminating sodium from the catalyst. Post-treatment with water at 45 °C allows the practical elimination of sodium. ICP-AES chemical analysis, SBET measurement, XRD and high resolution TEM are employed for characterization. The consequence of sodium presence is an important decrease in the CO-PROX activity, as supported by operando-DRIFTS.

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.01.018
      Issue No: Vol. 108 (2018)
       
  • Selective photocatalytic carbon dioxide conversion with Pt@Ag-TiO2
           nanoparticles
    • Authors: Yan Wang; Qinghua Lai; Yiming He; Maohong Fan
      Pages: 98 - 102
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Yan Wang, Qinghua Lai, Yiming He, Maohong Fan
      Pt@Ag-TiO2 nanocomposites were prepared and tested for photocatalytic CO2 conversion in the presence of H2O. The characterizations showed that Pt@Ag core@shell structures were formed. The photocatalytic activity of Pt@Ag x -TiO2 catalysts with different Ag content showed that the deposition of Ag shell could increase the photocatalytic CO2 reduction efficiency and selectivity by suppressing H2 generation. Pt@Ag1.0-TiO2 with an Ag content of 1.95 wt.‰ showed a maximum CH4 formation rate of 160.3 μmol·g−1·h−1, together with a CO2 reduction selectivity of 87.90%. PL spectra and photocurrent measurements indicated that Pt@Ag1.0-TiO2 had the highest photogenerated electron-hole separation efficiency among all the prepared photocatalysts.
      Graphical abstract image

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.004
      Issue No: Vol. 108 (2018)
       
  • AgPd nanoparticles supported on reduced graphene oxide: A high catalytic
           activity catalyst for the transfer hydrogenation of nitroarenes
    • Authors: Xiaotong Liu; Chenhuan Wang; Saisai Cheng; Ningzhao Shang; Shutao Gao; Cheng Feng; Chun Wang; Yuqing Qiao; Zhi Wang
      Pages: 103 - 107
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Xiaotong Liu, Chenhuan Wang, Saisai Cheng, Ningzhao Shang, Shutao Gao, Cheng Feng, Chun Wang, Yuqing Qiao, Zhi Wang
      In this paper, well dispersed AgPd nanoparticles supported on reduced graphene oxide were fabricated by a simple nonnoble metal sacrificial method. Firstly, the Co3(BO3)2 and AgPd nanoparticles were co-deposited on the surface of reduced graphene oxide, then the Co3(BO3)2 was sacrificed by acid etching. Highly dispersed AgPd nanoparticles were obtained by using cobalt as the sacrificial agent to prevent AgPd nanoparticles from aggregation. The obtained catalyst furnish excellent catalytic activity and chemoselectivity for the catalytic transfer hydrogenation of nitroarenes using formic acid and ammonium formate as hydrogen source at room temperature. The homologous aniline derivatives were obtained with high yields.
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      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.02.001
      Issue No: Vol. 108 (2018)
       
  • 1-(Alkylsulfonic)-3-methylimidazolium chloride Brönsted acidic ionic
           liquid catalyzed hydrogen peroxide oxidations of biomass derived furan
           aldehydes
    • Authors: Ananda S. Amarasekara; Nnaemeka C. Okorie
      Pages: 108 - 112
      Abstract: Publication date: April 2018
      Source:Catalysis Communications, Volume 108
      Author(s): Ananda S. Amarasekara, Nnaemeka C. Okorie
      5-Hydroxymethylfurfural was converted to succinic anhydride in 90–92% yield by oxidation with 30% hydrogen peroxide using 10 mol% 1-(alkylsulfonic)-3-methylimidazolium chloride acidic ionic liquid catalysts at 60 °C for 14 h. The acidic ionic liquid catalyst could be reused for four catalytic cycles without appreciable loss in catalytic activity. On the other hand oxidation of furfural under similar ionic liquid catalyzed conditions produced a mixture of three products: 2(5H)-furanone, succinic anhydride and maleic acid in 68, 8 and 12% yields respectively.

      PubDate: 2018-02-26T03:15:06Z
      DOI: 10.1016/j.catcom.2018.01.032
      Issue No: Vol. 108 (2018)
       
  • Growth of iron (hydr)oxides on different carbon substrates and their
           Fenton-like performance
    • Authors: Chuan Liang; Beibei Wang; Shengtao Xing
      Pages: 1 - 4
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Chuan Liang, Beibei Wang, Shengtao Xing
      Iron (hydr)oxides were deposited on different carbonaceous materials carriers and their Fenton-like performance was critically evaluated. The solid carbon substrate significantly affected the crystal structure of the iron-containing phase. In particular, a layer of α-FeOOH was formed on the surface of hydrochar microsphere at pH=6 and T=60°C without any additives for the synthesis conditions applied. Among the other obtained samples, the latter exhibited the highest catalytic activity, expressed either per gram of Fe metal or per total surface area basis, and the highest stability as well towards degradation of Orange II in the presence of H2O2. This is suggested to be due to the core@shell structure of hydrochar microsphere@α-FeOOH and its favorable catalytic mechanism and kinetics as compared to previously reported FeOOH Fenton catalysts. H2O2 mainly reacted with photo-generated holes rather than Fe(II)/(III) and photo-generated electrons to produce superoxide radicals.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.001
      Issue No: Vol. 107 (2018)
       
  • FeCl2/DTBP: An efficient and highly E-selective cross - coupling of
           silanes with styrene and its derivatives
    • Authors: Rui Xu; Chun Cai
      Pages: 5 - 8
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Rui Xu, Chun Cai
      An efficient FeCl2-catalyzed cross-coupling of silanes with styrene and its derivatives using DTBP as oxidant for selective synthesis of vinylsilanes was developed. This method presented an inexpensive, non-toxic and environmentally benign catalytic system with an appropriate substrate scope. This approach is E-specific and produced important classes of vinylsilanes in good yields. Control experiments indicated that the reaction may proceed via a radical pathway.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2017.12.023
      Issue No: Vol. 107 (2018)
       
  • A novel synthesis of unsupported Ni2P catalysts with high surface area at
           low temperature
    • Authors: Hua Song; Qi Yu; Nan Jiang; Yuanyuan Wang
      Pages: 9 - 13
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Hua Song, Qi Yu, Nan Jiang, Yuanyuan Wang
      A novel method for preparing unsupported Ni2P(x) (x =reduction temperature) catalysts at low temperature (500°C) was proposed, in which the nickel citrate was used as a source of nickel. The nickel citrate can greatly increase surface area of Ni2P catalyst, and promote formation of much smaller and highly dispersed uniform Ni2P particles, exposure of more active Ni sites on the surface of Ni2P(x)-L. The Ni2P(500)-L which reduced at 500°C exhibited the greatest HDS activity, the DBT conversion of which reached 95.6%, this is an increase of 33.5% when compared to that of the Ni2P.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.004
      Issue No: Vol. 107 (2018)
       
  • Co-SBA-15 catalysts in the hydrolysis of NH3BH3 – Influences of Co
           precursors and catalyst pre-treatment
    • Authors: Rory Herron; Charles Marchant; James A. Sullivan
      Pages: 14 - 17
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Rory Herron, Charles Marchant, James A. Sullivan
      H2 was released from ammonia borane (AB) through a hydrolysis reaction over several Co-SBA-15 catalysts. Each catalyst had an induction time prior to becoming active. The activation time related to the in-situ reduction of Co species to an active nano-particulate form and the length of this induction time varied as a function of the Co-precursor used. The rate of the hydrolysis reaction over the reduced and active catalysts depended on the precursor. While the induction time was not noted in subsequent reactions over the reduced catalysts, the reactivity differences remained. A rationale for the differences based on the preparation steps is suggested.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.008
      Issue No: Vol. 107 (2018)
       
  • Hydrogenolysis and hydrogenation of β-O-4 ketones by a simple
           photocatalytic hydrogen transfer reaction
    • Authors: Jia Fang; Peng Ye; Manye Wang; Deming Wu; Aihua Xu; Xiaoxia Li
      Pages: 18 - 23
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Jia Fang, Peng Ye, Manye Wang, Deming Wu, Aihua Xu, Xiaoxia Li
      Efficient cleavage of CO bonds in lignin and its models is of great importance for the production of value-added aromatic compounds. A simple TiO2 photochemical approach was applied for β-O-4 ketone hydrogenolysis by an electron transfer photocatalytic reaction. The conversion of the substrate 2-(2-methoxyphenoxy)-1-(4-methoxyphenyl) ethanone was 89.8% in 30min, with the yield of products 4-methoxy acetophenone of 75.2% and o-methoxyphenol of 98.9%. Compared to the selective hydrogenolysis role of TiO2, Pd/TiO2 catalyst prefers to simultaneously catalyzing the hydrogenative cleavage of CO ether bond and the hydrogenation of CO to CHOH.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.005
      Issue No: Vol. 107 (2018)
       
  • Catalytic isomerization of galactose into tagatose in the presence of
           bases and Lewis acids
    • Authors: Peter Drabo; Irina Delidovich
      Pages: 24 - 28
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Peter Drabo, Irina Delidovich
      Catalytic efficiency of bases and a Lewis acid for isomerization of galactose into tagatose was comparatively studied. NaH2PO4 +Na2HPO4 phosphates and Mg-Al hydrotalcite were tested as soluble and solid base catalysts. Selectivity towards tagatose over these base catalysts decreases along with galactose conversion owing to formation of sorbose as a side product. In the presence of the bases, yield of tagatose was limited to 16% obtained at 51% galactose conversion. Sn-BEA zeolite presents a solid Lewis acid. This catalyst enables a selective transformation of galactose giving rise to tagatose in 24% yield at 29% conversion of the substrate.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.011
      Issue No: Vol. 107 (2018)
       
  • Tailoring the porous structure of N-doped carbon for increased oxygen
           reduction reaction activity
    • Authors: Yimai Chen; Hui Wang; Shan Ji; Rongfang Wang
      Pages: 29 - 32
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Yimai Chen, Hui Wang, Shan Ji, Rongfang Wang
      A facile one-pot method using molten salt medium is developed to fabricate an open structured N-doped carbon (ONC) derived from biomass. SEM and TEM show the ONC is made up of interconnected thin amorphous carbon layers. N2 isotherm shows that ONC has hierarchical porous structure with a high specific surface area of 1893.5m2 g−1. Compared to commercial Pt/C (20wt%), the ONC has comparable ORR activity and better durability. Due to its high ORR activity and durability, producing an opened N-doped carbon in this molten salt medium can provide a promising approach for synthesizing heteroatom doped carbons with electrochemical performance.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.013
      Issue No: Vol. 107 (2018)
       
  • Copper (I)-mediated tandem A3 coupling/[3+2] cycloaddition chemoselective
           synthesis of 4H-[1,2,3]triazolo[1,5-a]indoles
    • Authors: Ramalingam Boobalan; Chinpiao Chen; Gene-Hsian Lee
      Pages: 33 - 38
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Ramalingam Boobalan, Chinpiao Chen, Gene-Hsian Lee
      The copper (I) mediated tandem reaction of A3 coupling followed by a [3+2] cycloaddition methodology is developed for the first synthesis of structurally interesting 3-aryl/alkyl/silyl-4-amino-4H-[1,2,3]triazolo[1,5-a]indoles from various 2-azidobenzaldehydes, secondary amines, and terminal alkynes. The optimal reaction conditions of this one-pot tandem reaction are simple, performed at room temperature, and produce the corresponding products with high yields (up to 84%). The intermolecular [3+2] cycloaddition of 2-azidobenzaldehydes and terminal alkynes is found to be the competitive reaction for the presently developed tandem reaction with 2-triazole benzaldehydes as the minor products. The latter were also isolated and characterized.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2017.12.020
      Issue No: Vol. 107 (2018)
       
  • Preparation of low-molecular-weight citrus pectin by recombinant Bacillus
           subtilis pectate lyase and promotion of growth of Bifidobacterium longum
    • Authors: Ming-qi Liu; Wen-kang Huo; XianJun Dai; Ya-hui Dang
      Pages: 39 - 42
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Ming-qi Liu, Wen-kang Huo, XianJun Dai, Ya-hui Dang
      pel gene (GenBank: KM244046.1), which encodes Bacillus subtilis pectate lyase (PelB), was high-level expressed in Escherichia coli BL21 (DE3) and the recombinant enzyme was named rePelB. After induction by IPTG at 15°C for 24h, specific activity of rePelB in culture supernatant of pCpel-6 reached 197.4±5.20U/mg. The optima of rePelB were 60°C and pH5.0, respectively. Hydrolysis of citrus pectin by rePelB in 50L grass reactor was optimized by implementing RSM. HPLC analysis revealed molecular mass of citrus pectin and obtained LCP was 290 and 5.8kDa, respectively. LCP can significantly promote growth of Bifidobacterium longum.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.017
      Issue No: Vol. 107 (2018)
       
  • MOF-derived magnetic Ni-carbon submicrorods for the catalytic reduction of
           4-nitrophenol
    • Authors: Lina Jin; Xiaoshuang Zhao; Jian Ye; Xinye Qian; Mingdong Dong
      Pages: 43 - 47
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Lina Jin, Xiaoshuang Zhao, Jian Ye, Xinye Qian, Mingdong Dong
      Magnetic Ni-carbon submicrorods were easily synthesized via the direct pyrolysis of [Ni3(BTC)2·12H2O] precursors at different temperatures. The [Ni3(BTC)2·12H2O] precursors were obtained using a simple direct precipitation method at room temperature, which is distinctly different from previous reports. The porous Ni-carbon submicrorods obtained exhibited excellent catalytic activity and good reusability for the reduction of 4-nitrophenol to 4-aminophenol. In particular, the activity factor κ (κ=k/m, s−1 g−1) of the Ni/C catalyst synthesized at 800°C was found to be 17.41s−1 g−1, which is higher than that of many previously reported Ni-based and noble metal-based catalysts. Therefore, magnetically recoverable Ni-carbon submicrorods appear as promising catalysts to be practically explored for the reduction of 4-nitrophenol because of their facile synthesis and excellent performance.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2017.11.014
      Issue No: Vol. 107 (2018)
       
  • Effect of MgAl hydrotalcite crystallinity on catalytic Baeyer-Villiger
           oxidation of cyclohexanone with H2O2/acetonitrile
    • Authors: Joanna E. Olszówka; Robert Karcz; Bogna D. Napruszewska; Alicja Michalik-Zym; Dorota Duraczyńska; Joanna Kryściak-Czerwenka; Anna Niecikowska; Krzysztof Bahranowski; Ewa M. Serwicka
      Pages: 48 - 52
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Joanna E. Olszówka, Robert Karcz, Bogna D. Napruszewska, Alicja Michalik-Zym, Dorota Duraczyńska, Joanna Kryściak-Czerwenka, Anna Niecikowska, Krzysztof Bahranowski, Ewa M. Serwicka
      A series of magnesium-aluminum hydrotalcite-like compounds with molar ratio Mg/Al=3 and different crystal sizes were prepared by variation of the synthesis parameters and characterized with powder XRD, XRF, SEM, N2 adsorption/desorption (−196°C), FTIR spectroscopy, thermal analysis, selective chemisorption of acrylic acid, and contact angle measurements. The materials were tested as catalysts in the Baeyer-Villiger oxidation of cyclohexanone to ε-caprolactone with H2O2/acetonitrile as oxidizing system in mild conditions (70°C, 1atm). The study revealed that the catalyst primary crystal size constitute an important parameter affecting the catalytic performance. In particular, lowering of the crystal size improved catalyst's selectivity. This effect is discussed in terms of the evolution of catalyst's hydrophilicity upon crystal size diminution and its impact on the interaction with organic and inorganic reagents. The efficiency of H2O2 utilization is significantly lower than expected from the reaction stoichiometry, due to the decomposition of H2O2 and/or occurrence of non-selective reaction pathways.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.014
      Issue No: Vol. 107 (2018)
       
  • Hydrothermal synthesis of Bi6O6(OH)3(NO3)3·1.5H2O/BiOCl heterojunction
           with highly enhanced photocatalytic activity
    • Authors: Qun Li; Lu Li; Xingfeng Zhang; Xiarong Zheng; Tareque Odoom-Wubah; Daohua Sun; Yanmei Zheng; Jiale Huang; Qingbiao Li
      Pages: 53 - 56
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Qun Li, Lu Li, Xingfeng Zhang, Xiarong Zheng, Tareque Odoom-Wubah, Daohua Sun, Yanmei Zheng, Jiale Huang, Qingbiao Li
      In this study, an efficient Bi6O6(OH)3(NO3)3·1.5H2O/BiOCl heterojunction was prepared by a facile hydrothermal method, Bi6O6(OH)3(NO)3·1.5H2O nanoparticles with an average size of approximately 10nm were grown uniformly in situ on the plates of BiOCl. The modification of Bi6O6(OH)3(NO3)3·1.5H2O effectively improves the photocatalytic activity of BiOCl for the degradation of rhodamine B (RhB). The enhancement of the photocatalytic activity could be attributed to the increased light harvesting ability, decreased charge resistance, and suppressed recombination of photoinduced electron–hole pairs in Bi6O6(OH)3(NO3)3·1.5H2O/BiOCl heterojunction.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.003
      Issue No: Vol. 107 (2018)
       
  • Ultrathin γ-Fe2O3 nanosheets as a highly efficient catalyst for the
           chemoselective hydrogenation of nitroaromatic compounds
    • Authors: Xueliang Cui; Xia Zhou; Zhengping Dong
      Pages: 57 - 61
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Xueliang Cui, Xia Zhou, Zhengping Dong
      Ultrathin γ-Fe2O3 nanosheets (γ-Fe2O3-UNSs) were successfully prepared through a simple strategy. The as-prepared γ-Fe2O3-UNSs were used for the chemoselective hydrogenation of nitroaromatic compounds to corresponding aniline compounds using N2H4·H2O as a hydrogen donor. An excellent catalytic activity and 100% selectivity for the aniline products were obtained. Moreover, γ-Fe2O3-UNSs can be easily separated from the reaction solution by an external magnet due to its superparamagnetic property, and recycled at least six cycles without any obvious decrease in its catalytic activity.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.015
      Issue No: Vol. 107 (2018)
       
  • Cu@Fe3O4-TiO2-L-dopa: A novel and magnetic catalyst for the Chan-Lam
           cross-coupling reaction in ligand free conditions
    • Authors: Harsha Sharma; Hitesh Mahajan; Babita Jamwal; Satya Paul
      Pages: 68 - 73
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Harsha Sharma, Hitesh Mahajan, Babita Jamwal, Satya Paul
      A novel and magnetic Cu(0) catalyst (Cu@Fe3O4-TiO2-L-dopa) has been prepared and characterized with different techniques, such as SEM, HR-TEM, ICP-AES, XRD, FTIR, EDX, CHN analysis, VSM and TGA studies. TiO2 nanoparticles were proved to be efficient in stabilizing magnetite nanoparticles, thus preventing their agglomeration. It has been also observed that grafting of Fe3O4-TiO2 with L-dopa reduces the leaching of Cu(0) nanoparticles. The synthesized catalyst showed excellent catalytic activity for the Chan-Lam cross-coupling reaction of phenyl boronic acid with different substituted anilines in ligand-free conditions, and was found to be recyclable up to 6 runs without loss of significant activity.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.016
      Issue No: Vol. 107 (2018)
       
  • Synthesis of Bi/BiOCl-TiO2-CQDs quaternary photocatalyst with enhanced
           visible-light photoactivity and fast charge migration
    • Authors: Wei Li; Chenhui Zhao; Qiuyu Zhang
      Pages: 74 - 77
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Wei Li, Chenhui Zhao, Qiuyu Zhang
      A series of Bi/BiOCl/TiO2-CQDs(α) (BBTC-α) quaternary photocatalysts with lamellar structure were synthesized via a solvothermal method followed by a hydrothermal process. The BBTC-0.6 photocatalyst exhibited highest visible-light photoactivity in decomposing methyl orange and p-nitrophenol, and it was about 4.8 and 10.3 times of BiOCl/TiO2 nanosheets. In this system, Bi and CQDs were served as electron donors, and BiOCl and TiO2 were served as electron trappers to extend the lifetime of photogenerated carriers. The enhanced visible-light photoactivity could be attributed to the strong light absorption and upconversion photoluminescence of the CQDs, and the surface plasmon resonance effect of the surface Bi also played an important role in this system.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2017.11.011
      Issue No: Vol. 107 (2018)
       
  • Rhodium-catalyzed asymmetric synthesis of 1,1-disubstituted
           1,3-dihydrobenzo[c]furans from prochiral triynes and internal alkynes
    • Authors: Fei Ye; Mansour Haddad; Virginie Ratovelomanana-Vidal; Véronique Michelet
      Pages: 78 - 81
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Fei Ye, Mansour Haddad, Virginie Ratovelomanana-Vidal, Véronique Michelet
      The cationic rhodium/Binap system was found to be an efficient catalytic system for the [2+2+2] cycloaddition of prochiral triynes with internal alkynes. The optimization of the catalytic system allowed the construction of 1,1-disubstituted 1,3-dihydrobenzo[c]furans containing a quaternary carbon stereogenic centers in fair yields and moderate enantiomeric excesses.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2017.12.008
      Issue No: Vol. 107 (2018)
       
  • Influence of the metal/metal oxide redox cycle on the catalytic activity
           of methane oxidation over Pd and Ni doped hydroxyapatite
    • Authors: Joanna Kamieniak; Peter J. Kelly; Aidan M. Doyle; Craig E. Banks
      Pages: 82 - 86
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Joanna Kamieniak, Peter J. Kelly, Aidan M. Doyle, Craig E. Banks
      The methane oxidation reaction was investigated over Pd and Ni doped hydroxyapatite (HAP) catalysts. All catalysts were evaluated in both their reduced and oxidised forms, and the behaviour of the metals in the reaction was investigated. The obtained results demonstrated that the reaction proceeds through a redox cycle between metal oxide and reduced metal, however more stable catalysts with higher conversions were observed when the catalysts were pre-treated in oxygen. After CH4 oxidation, all the samples were tested towards coke formation using TGA analysis; results showed that all the catalysts were resistant to the coking process under the conditions studied.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2017.12.017
      Issue No: Vol. 107 (2018)
       
  • Transition metal-free and base-mediated transformation arylation of
           unactivated benzene with aryl halides in presence of
           N,N′-bis(salicylidene)ethylenediamine as organocatalyst
    • Authors: Ehsan Ghonchepour; Mohammad Reza Islami; Hamid Mostafavi; Ahmad Momeni Tikdari; Iran Sheikhshoaie
      Pages: 87 - 91
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Ehsan Ghonchepour, Mohammad Reza Islami, Hamid Mostafavi, Ahmad Momeni Tikdari, Iran Sheikhshoaie
      Direct transition metal-free arylation of benzene has been achieved using a combination of various aryl halides and N,N′-bis(salicylidene)ethylenediamine as a new ligand and catalyst. This facile one-pot reaction is reported as a new CH functionalization protocol for the synthesis of biaryls. In this research, 18-crown-6 and several Schiff-bases were tested and among them, N,N′-bis(salicylidene)ethylenediamine was found to be a great catalyst for this cross-coupling.

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.007
      Issue No: Vol. 107 (2018)
       
  • Enhancement of photocatalytic performance in CO2 reduction over Mg/g-C3N4
           catalysts under visible light irradiation
    • Authors: Jun-ying Tang; Wei-guo Zhou; Rui-tang Guo; Chun-ying Huang; Wei-guo Pan
      Pages: 92 - 95
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Jun-ying Tang, Wei-guo Zhou, Rui-tang Guo, Chun-ying Huang, Wei-guo Pan
      A series of flaked Mg/g-C3N4 catalysts were synthesized via an in-situ hydrothermal deposition method and measured their photocatalytic activity for CO2 reduction. The characterization results indicated that the obtained Mg/pCN catalysts had high surface area and massive active sites for CO2 absorption. The introduction of Mg species had a positive effect to extend the spectral response property and increased the separation rate of photogenerated electron-holes pairs. Mg-doped g-C3N4 catalysts showed much higher photocatalytic performance than pCN. The maximum CH4 and CO yields of 17.09 and 4.13μmol/g-cat, respectively, had been obtained for CO2 reduction after 6h reaction.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
      DOI: 10.1016/j.catcom.2018.01.006
      Issue No: Vol. 107 (2018)
       
  • Relative activity of Niobia-supported CoMo hydrodesulphurization catalyst
           prepared with NTA: A kinetic approach
    • Authors: Miroslav
      Abstract: Publication date: 10 March 2018
      Source:Catalysis Communications, Volume 107
      Author(s): Luděk Kaluža, Miroslav Zdražil
      A sulphide CoMo/Nb2O5 HDS catalyst was prepared for the first time using nitrilotriacetic acid (NTA) as complexing agent, where the impregnation solution consisted of NTA, cobalt carbonate and ammonium heptamolybdate. It contained neither NH4OH nor NO3 − ions. The hydrodesulphurization activity of the catalyst was tested using as model sulphur compound that of thiophene at 1.0MPa and 400°C. The ratio of activities (based on pseudo-first order kinetics) expressed in terms of the rate constant k, where the latter was estimated from specific reaction rate data per mass of catalyst, for the NTA-CoMo/Nb2O5 and CoMo/Nb2O5 catalysts was found to be 6.6. Thus, using NTA shifted CoMo/Nb2O5 system from a low activity catalyst (as observed in the literature) to a high activity catalyst worthwhile for further investigations (present results). The NTA-CoMo/Nb2O5 (S BET =40m2 g−1) was more active than commercial CoMo/Al2O3 (S BET =194m2 g−1) not only in terms of specific activity normalized per total surface area (mols m−2 s−1, 5.7 times larger) but also in terms of specific activity normalized per mass of catalyst sample (mols g−1 s−1, 1.2 times larger).
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
 
 
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