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  Subjects -> ENGINEERING (Total: 2312 journals)
    - CHEMICAL ENGINEERING (196 journals)
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    - ELECTRICAL ENGINEERING (104 journals)
    - ENGINEERING (1213 journals)
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ENGINEERING (1213 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 7)
AASRI Procedia     Open Access   (Followers: 15)
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: 254)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
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: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
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: 6)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
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Advances in Fuzzy Systems     Open Access   (Followers: 5)
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Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
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Advances in Remote Sensing     Open Access   (Followers: 40)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 2)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 32)
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: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 17)
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: 8)
Annals of Science     Hybrid Journal   (Followers: 7)
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: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
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Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
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: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 4)
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: 14)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 18)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 34)
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: 14)
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: 30)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
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   (Followers: 1)
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: 1)
CienciaUAT     Open Access  
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: 14)
City, Culture and Society     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
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: 27)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 271)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 199)
Composites Part B : Engineering     Hybrid Journal   (Followers: 257)
Composites Science and Technology     Hybrid Journal   (Followers: 194)
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Computers & Geosciences     Hybrid Journal   (Followers: 30)
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Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
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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)
Corrosion Series     Full-text available via subscription   (Followers: 6)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)

        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  [3123 journals]
  • Fine tuning the enantioselectivity and substrate specificity of alcohol
           dehydrogenase from Kluyveromyces polysporus by single residue at 237
    • 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
       
  • Production of diethyl carbonate from ethylene carbonate and ethanol over
           supported fluoro-perovskite catalysts
    • 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
       
  • Promoting effects of lanthanum oxide on the NiO/CeO2 catalyst for hydrogen
           production by autothermal reforming of ethanol
    • 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
       
  • Influence of polyoxometalate structure in ammoxidation of 2-methylpyrazine
    • 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
       
  • Cu-ZSM-5 zeolite supported on SiC monolith with enhanced catalytic
           activity for NH3-SCR
    • 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
       
  • Photocatalytic reduction of CO2 over facet engineered TiO2 nanocrystals
           supported by carbon nanofibers under simulated sunlight irradiation
    • 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
       
  • Bio-inspired Mn-catalysts immobilized on silica surface: The influence of
           the ligand synthesis on catalytic behavior
    • 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
       
  • Oxidation of styrene using TiO2-graphene oxide composite as solid
           heterogeneous catalyst with hydroperoxide as oxidant
    • 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
       
  • Green synthesis of low-carbon chain nitroalkanes via a novel tandem
           reaction of ketones catalyzed by TS-1
    • 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
       
  • New synthetic approach towards well-defined silica supported tungsten
           bis-oxo, active catalysts for olefin metathesis
    • 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
       
  • Efficient synthesis of ultrafine Pd nanoparticles on an activated N-doping
           carbon for the decomposition of formic acid
    • 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
       
  • An efficient method for synthesizing monofunctionalized derivatives of
           1,1,3,3-tetramethyldisiloxane in ionic liquids as recoverable solvents for
           rhodium catalyst
    • 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
       
  • Excellent catalytic performance for methanol to olefins over SAPO-34
           synthesized by controlling hydrothermal temperature
    • 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
       
  • Growth of iron (hydr)oxides on different carbon substrates and their
           Fenton-like performance
    • 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
       
  • FeCl2/DTBP: An efficient and highly E-selective cross - coupling of
           silanes with styrene and its derivatives
    • 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
       
  • A novel synthesis of unsupported Ni2P catalysts with high surface area at
           low temperature
    • 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.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Co-SBA-15 catalysts in the hydrolysis of NH3BH3 – Influences of Co
           precursors and catalyst pre-treatment
    • 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
       
  • Hydrogenolysis and hydrogenation of β-O-4 ketones by a simple
           photocatalytic hydrogen transfer reaction
    • 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
       
  • Catalytic isomerization of galactose into tagatose in the presence of
           bases and Lewis acids
    • 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
       
  • Tailoring the porous structure of N-doped carbon for increased oxygen
           reduction reaction activity
    • 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
       
  • Copper (I)-mediated tandem A3 coupling/[3+2] cycloaddition chemoselective
           synthesis of 4H-[1,2,3]triazolo[1,5-a]indoles
    • 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
       
  • Preparation of low-molecular-weight citrus pectin by recombinant Bacillus
           subtilis pectate lyase and promotion of growth of Bifidobacterium longum
    • 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
       
  • MOF-derived magnetic Ni-carbon submicrorods for the catalytic reduction of
           4-nitrophenol
    • 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.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Effect of MgAl hydrotalcite crystallinity on catalytic Baeyer-Villiger
           oxidation of cyclohexanone with H2O2/acetonitrile
    • 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.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Hydrothermal synthesis of Bi6O6(OH)3(NO3)3·1.5H2O/BiOCl heterojunction
           with highly enhanced photocatalytic activity
    • 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.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Ultrathin γ-Fe2O3 nanosheets as a highly efficient catalyst for the
           chemoselective hydrogenation of nitroaromatic compounds
    • 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.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Relative activity of Niobia-supported CoMo hydrodesulphurization catalyst
           prepared with NTA: A kinetic approach
    • 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).
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      PubDate: 2018-02-05T16:30:57Z
       
  • Cu@Fe3O4-TiO2-L-dopa: A novel and magnetic catalyst for the Chan-Lam
           cross-coupling reaction in ligand free conditions
    • 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
       
  • Synthesis of Bi/BiOCl-TiO2-CQDs quaternary photocatalyst with enhanced
           visible-light photoactivity and fast charge migration
    • 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
       
  • Rhodium-catalyzed asymmetric synthesis of 1,1-disubstituted
           1,3-dihydrobenzo[c]furans from prochiral triynes and internal alkynes
    • 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
       
  • Influence of the metal/metal oxide redox cycle on the catalytic activity
           of methane oxidation over Pd and Ni doped hydroxyapatite
    • 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
       
  • Transition metal-free and base-mediated transformation arylation of
           unactivated benzene with aryl halides in presence of
           N,N′-bis(salicylidene)ethylenediamine as organocatalyst
    • 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
       
  • Enhancement of photocatalytic performance in CO2 reduction over Mg/g-C3N4
           catalysts under visible light irradiation
    • 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.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Transesterification of ethylene carbonate to dimethyl carbonate catalyzed
           by CeO2 materials with various morphologies
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Huan Zheng, Ying Hong, Jie Xu, Bing Xue, Yong-Xin Li
      A series of ceria materials with various morphologies including rods, cubes, and polyhedra were fabricated by simple hydrothermal approaches. In the transesterification of ethylene carbonate with CH3OH, the ceria samples showed different catalytic activity, depending on their morphologies. Among them, ceria with rod (CeO2-R) shapes demonstrated the highest catalytic activity, affording a DMC yield of 71% at 140°C, also could be reused for at least five catalytic runs. According to CO2-TPD characterization results, the CeO2-R possesses the strongest base strength, which is responsible for its highest catalytic performance.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Development a facile way to restore reactivity of deactivated phosphate
           catalysts for Prins reaction with the assistance of carbon deposition
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Yanlong Qi, Long Cui, Yunqi Li, Quanquan Dai, Chenxi Bai
      Without calcination or removing carbon deposition, a facile way to restore catalytic capacity of deactivated phosphate catalysts for Prins reaction was developed with the assistance of carbon deposition. The catalytic activity was successful restored by mixing the fresh catalysts with deactivated ones, which can be owed to the synergy effect between acid species and carbonaceous species for isoprene synthesis.

      PubDate: 2018-02-05T16:30:57Z
       
  • Direct non-oxidative methane aromatization over gallium nitride catalyst
           in a continuous flow reactor
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Kanchan Dutta, Lu Li, Pranjal Gupta, Daniel Pacheco Gutierrez, Jan Kopyscinski
      The direct non-oxidative methane aromatization over commercially available gallium nitride powder has been investigated for the first time in a fixed bed reactor under continuous operation. Gallium nitride catalyst is highly active. High reaction temperatures (650–710°C) are needed to initiate benzene formation due to the small surface area (8m2 g−1) of the gallium nitride material, thermodynamic constraints and the low residence time (1–4s). Besides benzene and toluene, C2 species and coke were formed.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • Synthesis and characterization of magnetic LiFe5O8-LiFeO2 as a solid basic
           catalyst for biodiesel production
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Yong-Ming Dai, Ya-Fen Wang, Chiing-Chang Chen
      This study is focused on the transesterification of the soybean oil into biodiesel using magnetic based solid catalysts (LiFe5O8-LiFeO2). The catalyst was prepared through a simple solid-state reaction that involved mixing and grinding iron oxide (Fe2O3) and Li2CO3. The results demonstrated that the catalyst was ferromagnetic. Under the optimal reaction conditions, the highest FAME conversion in the transesterification of soybean oil can reach 96.5% by using LiFe5O8-LiFeO2 catalyst. The LiFe5O8-LiFeO2 demonstrates excellent catalytic activities and it could be recovered by magnetic separation. The LiFe5O8-LiFeO2 can be easily recovered and reused without significant deactivation.

      PubDate: 2018-02-05T16:30:57Z
       
  • In-situ synthesis of Cu2O/reduced graphene oxide composite as effective
           catalyst for ozone decomposition
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Shuyan Gong, Jiayuan Chen, Xiaofeng Wu, Ning Han, Yunfa Chen
      Nowadays, highly efficient decomposition of ozone is still technologically challenging, especially in the presence of high humidity levels. In this study, Cu2O/reduced graphene oxide composite (Cu2O/rGO) is in-situ synthesized by reducing a mixed solution of Cu2+ and GO. This developed catalytic system exhibits 100% ozone (20ppm O3/air) decomposition efficiency at room temperature with high stability. Importantly, the ozone conversion could be still above 96% at high relative humidity levels (ca. 90%) after 10h of continuous operation. The excellent performance is suggested to be attributed to the highly active ultrafine Cu2O nanoparticles heterogeneously nucleated on rGO, which facilitate necessary electron density by the transfer of it between Cu2O and rGO phases.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • Cationic acetylacetonate palladium complexes/boron trifluoride etherate
           catalyst systems for polymerization of 5-methoxycarbonylnorbornene
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): D.S. Suslov, M.V. Bykov, A.V. Kuzmin, P.A. Abramov, O.V. Kravchenko, M.V. Pakhomova, A.V. Rokhin, I.A. Ushakov, V.S. Tkach
      A simple protocol using cationic acetylacetonate palladium complexes with mono-/bidentate phosphine ligands activated with BF3·OEt2 as in situ-formed catalyst for polymerization of endo/exo mixture of 5-methoxycarbonylnorbornene (activity up to 1.1·104 gmol−1 h−1) or 5-phenylnorbornene (7.2·105 gmol−1 h−1), and norbornene (3.3·108 gmol−1 h−1) have been developed. It was observed that the ligands nature strongly influence the catalytic activity. The catalyst system Pd(II)/BF3·OEt2 was also active for the copolymerization of norbornene with 5-methoxycarbonylnorbornene. DFT calculations of isomers upon single insertion of 5-methoxycarbonylnorbornene into PdH bond and NMR/FTIR studies for pre-catalyst activation mechanism were performed.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Catalytic synthesis of alkyl (S,S)-O-Lactyllactates: Efficiency in action
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Valeriy S. Cherepakhin, Kirill V. Zaitsev
      A new catalytic method for the synthesis of alkyl (S,S)-O-lactyllactates, HOCH(Me)C(O)OCH(Me)CO2R, 1–10 (R=Me, Et, n-Pr, i-Pr, n-Bu, i-Bu, i-Am, allyl, Cy, 3-HOC6H4CH2) was developed. Aluminum chloride catalyzes the reaction between l-lactide and a range of aliphatic alcohols under mild conditions. Corresponding alkyl lactyllactates may be isolated in high yields after distillation, what allows to perform separation from traces of corresponding lactates. It was established that AlCl3 reacts with alcohols with concomitant production of HCl and Al alkoxide complexes (like 11), which are both catalytically competent species for the alcoholysis of lactide.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Apparent activation energies and reaction rates of N2O decomposition via
           different routes over Co3O4
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Haibiao Yu, Xinping Wang
      Apparent activation energies and reaction rates of N2O decomposition via L-H and E-R routes over Co3O4 were experimentally estimated after considering the increase of active sites with reaction temperature. It was found that the apparent activation energy is 32.9kJ/mol for the L-H route and 44.8kJ/mol for the E-R route, while the order of reaction with respect to O2 is −0.367 at 350°C and −0.338 at 450°C. The contribution of the E-R route to the total reaction rate was found to be considerably increased with the reaction temperature and which was well interpreted by the apparent activation energies of the two reaction routes.
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      PubDate: 2018-02-05T16:30:57Z
       
  • Nitric acid-catalyzed aerobic oxidation of benzylic sp3 CH bonds of
           isochromans, xanthenes and 9-fluorenone under additive-free conditions
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Xinzhe Tian, Fangping Ren, Bo Zhao, Yun-Lai Ren, Shuang Zhao, Jianji Wang
      HNO3 was demonstrated to be an effective catalyst for aerobic oxidation of benzylic sp3 CH bonds under additive-free conditions. A series of isochromans, xanthenes and fluorenes underwent this transformation to give the targeted products in low to high yields under the catalysis of HNO3, which provided an effective method for the synthesis of the synthetically and biologically valued isochromanones, xanthones and 9-fluorenones.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • TBAI-catalyzed oxidative self-coupling of benzyl bromides under
           solvent-free conditions: A new pathway toward synthesis of benzyl
           benzoates
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Dariush Saberi, Hajar Hashemi
      A new pathway was developed for the synthesis of benzyl benzoates via TBAI-mediated oxidative self-coupling of benzyl bromides in the presence of tert-butyl hydroperoxide (TBHP) as an oxidant under solvent-free conditions. Various derivatives of precursors including electron donating and withdrawing groups as well as heteroaromatic and polycyclic benzyl bromides were subjected to the reaction conditions and converted to the corresponding benzylic esters in good to high yields. Mechanistic studies showed that this reaction did not take place via the radical pathway and tert-butyl peresters and benzoic acids are two key intermediates in this transformation.

      PubDate: 2018-02-05T16:30:57Z
       
  • Noble metal-free NiS/P-S codoped g-C3N4 photocatalysts with strong visible
           light absorbance and enhanced H2 evolution activity
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Liping Liu, Xuejun Xu, Zhichun Si, Zehao Wang, Rui Ran, Yonghong He, Duan Weng
      Noble metal-free NiS/P-S codoped g-C3N4 (PSCN) nanocomposites were fabricated by combination of thermal copolymerization using ammonium O, O- diethyl dithiophosphate as P-S precursor and ion-exchange precipitation. The optimal H2-generation rate of NiS/PSCN is 30.5μmolh−1, which is 1.9 times higher than that of NiS/pristine g-C3N4. The codoping of P and S into g-C3N4 not only enhances the light harvesting, but also promotes the charge separation. Noble metal-free NiS loaded onto PSCN serves as electron trapping centers and active sites for hydrogen evolution which further enhances the photocatalytic H2 evolution activity of PSCN.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • TiO2 on MoSe2 nanosheets as an advanced photocatalyst for hydrogen
           evolution in visible light
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Shufang Kou, Xia Guo, Xiaofeng Xu, Jian Yang
      TiO2 grown on MoSe2 nanosheets was synthesized by a simple process and explored as photocatalyst for hydrogen generation. In visible light, hydrogen generation rate over the MoSe2/TiO2 photocatalyst was found to be 468.2μmolh−1 g−1, much higher than the corresponding rates obtained over the MoSe2, TiO2 and their physical mixture. It is suggested that the good absorption of MoSe2 to visible light and the improved charge separation by the interface of MoSe2/TiO2 greatly promote hydrogen generation rate, as supported by the transient photocurrent responses and electrochemical impedance spectra recorded.

      PubDate: 2018-02-05T16:30:57Z
       
  • Graphene oxide as a sustainable metal and solvent free catalyst for
           dehydration of fructose to 5-HMF: A new and green protocol
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Melad Shaikh, Sunil K. Singh, Santimoy Khilari, Mahendra Sahu, Kalluri V.S. Ranganath
      The metal free catalytic dehydration of fructose to 5-hydroxymethylfurfural (5-HMF) using graphene oxide catalyst is reported. The reaction has been employed under solvent free condition with high reactivity and selectivity. The metal free catalyst, graphene oxide was characterized by FTIR, XRD, TEM, and Raman spectroscopy.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • I2/TBHP/cyclohexanone a novel catalyst system for the oxidative
           dearomatization of indoles to indolin-3-ones at room temperature under
           solvent-free condition
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Bhaskar Deka, Mohit L. Deb, Ranjit Thakuria, Pranjal K. Baruah
      Here we report a novel metal-free catalyst system for the oxidative dearomatization of indoles to indolin-3-ones. I2, TBHP and cyclohexanone together forms the catalyst system. Indole undergoes oxidative trimerization, whereas 2-substituted indole gives oxidative dimerized product. No solvent is required for the reaction and is carried out at room temperature. Electron-deficient indoles give lower or no yields, while electron-rich indoles produce excellent yields. The mechanism of the reaction is studied.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • Vapour phase selective hydrogenation of benzaldehyde to benzyl alcohol
           using Cu supported Mg-Al hydrotalicite catalyst
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): T.B. Jayesh, K. Itika, G.V. Ramesh Babu, K.S. Rama Rao, R.S. Keri, Arvind H. Jadhav, B.M. Nagaraja
      The vapour phase catalytic hydrogenation of benzaldehyde to benzyl alcohol using copper supported Magnesium-Alumina (Mg-Al) hydrotalicite (CuHT) catalyst was studied. The effect of various copper metal loadings, reaction temperature and different preparatory methods on the activity of catalysts was determined. A better catalytic performance was observed for 12.5CuHT catalyst prepared by impregnation method at 250°C. The maximum conversion of about 68% with 93% benzyl alcohol selectivity was obtained at the optimized conditions. The catalyst was active upto 87h with time-on-stream. The activity of CuHT was influenced by high surface area, smaller crystallite size and weak metal support interaction.
      Graphical abstract image

      PubDate: 2018-02-05T16:30:57Z
       
  • Synthesis of BiOBr microspheres with ethanol as self-template and solvent
           with controllable morphology and photocatalytic activity
    • Abstract: Publication date: 5 March 2018
      Source:Catalysis Communications, Volume 106
      Author(s): Ruiping Li, Huijun Ren, Wanhong Ma, Shaoming Hong, Lei Wu, Yingping Huang
      Flower-like bismuth oxybromide (BiOBr) microspheres with highly controllable morphology and photocatalytic activity were facilely synthesized in ethanol using Bi(NO3)3·5H2O and NaBr. The effects of solvothermal conditions on the morphology and composition were investigated and a mechanism for the microsphere formation was proposed. The temperature and pH of the solvothermal reaction had little effect on morphology but a large effect on visible light photocatalytic activity, which was attributed to changes in the facet intensity ratio, I 110/102. Microspheres prepared at 140°C and pH=7 had the highest I 110/102 ratio and degraded Rhodamine B (RhB) more rapidly than other BiOBr preparations. The (110) plane has surface Bi3+ sites that coordinate with the carboxylate anion of RhB, thus increasing adsorption but also a stronger internal electric field (IEF) that increases e −-h + separation efficiency. These findings provide a better understanding of the effects of solvothermal conditions on the crystal growth and activity of semiconductor photocatalysts.
      Graphical abstract image

      PubDate: 2017-12-26T19:08:52Z
       
 
 
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