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  Subjects -> ENGINEERING (Total: 2267 journals)
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ENGINEERING (1196 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
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: 216)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
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: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
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: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18)
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Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
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Advances in Remote Sensing     Open Access   (Followers: 35)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access  
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: 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)
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: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
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: 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: 2)
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: 7)
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: 7)
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: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
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: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
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: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
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: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
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: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
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: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
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: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 176)
Composites Part B : Engineering     Hybrid Journal   (Followers: 224)
Composites Science and Technology     Hybrid Journal   (Followers: 164)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
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Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
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Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
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Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
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Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 | 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  [3032 journals]
  • Efficient bioreductive production of (R)-N-Boc-3-hydroxypiperidine by a
           carbonyl reductase
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Li-Feng Chen, Yi-Ping Zhang, Hai-Yang Fan, Kai Wu, Jin-Ping Lin, Hua-Lei Wang, Dong-Zhi Wei
      The 3-hydroxypiperidine moiety is a privileged scaffold encountered in many bioactive compounds. An NADPH-dependent reductase (YGL039W) from Kluyveromyces marxianus ATCC 748 was isolated to show excellent catalytic activity in (R)-N-Boc-3-hydroxypiperidine [(R)-NBHP] production. Using a GDH-catalyzed cofactor-recycling system to ensure a sufficient supply of NADPH, the effects of temperature, pH, metal ions, substrate concentration, biocatalyst dosage, and cofactors on the YGL039W-catalyzed bioreduction were investigated and optimized. Finally, an extremely high concentration of N-Boc-piperidin-3-one (NBPO, 400g/L) could be completely reduced to (R)-NBHP (>99% ee), with a total turnover number of 20,000. This process shows significant potential for the industrial production of (R)-NBHP.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • iTPR - a new methodical approach for temperature programmed reduction of
           catalysts with improved sensitivity
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): A.G. Thomé, S. Peters, F. Roessner
      A new method for temperature programmed reduction (TPR) of reducible bulk or supported metal compounds with hydrogen is presented. The setup, involving a flame ionization detector (FID) and methanizer, allows to study the reduction behavior of amounts down to 0.1mg as shown for the reduction of Cu2O. By co-feeding CO2 in excess, hydrogen is converted into methane which is then detected by the FID.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Hydroconversion of C18 fatty acids using PtNi/Al2O3: Insight in the role
           of hydroxyl groups in Al2O3
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Hao Chen, Xiangwen Zhang, Qingfa Wang
      The catalytic hydroconversion of C18 fatty acids over PtNi/Al2O3 catalysts was investigated to explore the role of hydroxyls in Al2O3 on the catalytic activity. The amount of hydroxyls in acidic Al2O3 was 2.5 times that in neutral Al2O3 but with the same acidity. High content of hydroxyl in Al2O3 increased the NiPt-Al2O3 interaction and differed the Pt valence distribution. The NiPt/acidic Al2O3 catalyst showed 56% DCO2 while the Ni-Pt/neutral Al2O3 catalyst showed 58% DCO products due to the different NiPt-Al2O3 interaction. The high amount of Pt4+ species in NiPt alloy contributed to the high selectivity of DCO2 reaction.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Peculiarity of Rh bulk diffusion in La-doped alumina and its impact on CO
           oxidation over Rh/Al2O3
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Vladimir O. Stoyanovskii, Aleksey A. Vedyagin, Alexander M. Volodin, Roman M. Kenzhin, Yury V. Shubin, Pavel E. Plyusnin, Ilya V. Mishakov
      The catalytic behavior and stability of rhodium supported on pure and La-doped alumina were studied towards the CO oxidation reaction. Diffusion of Rh3+ ions into the bulk of support was shown to cause rapid deactivation in both cases. Alumina doping with La leads to modification of the alumina donor sites, concentrating of Rh near such sites, and acceleration of Rh3+ diffusion process. Diffused Rh ions were shown by means of photoluminescence to localize in the nearest coordination environment of the La ions in La-enriched alumina starting from a calcination temperature of 800°C.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Effect of ethylene glycol concentration on the morphology and catalytic
           properties of TiO2 nanotubes
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Hua Song, Kai Cheng, Haifeng Guo, Fang Wang, Junlei Wang, Ningfang Zhu, Mingxing Bai, Xueqin Wang
      Effect of ethylene glycol (EG) concentration on the micromorphology and photocatalytic property of TiO2 nanotubes was investigated. When EG concentration is varied from 10% to 90%, Ti foil was first oxidized to form a multiporous structure, and the nanotube structure was observed at EG concentration of 70%. Increasing the EG concentration further resulted in more regular and longer TiO2 nanotube arrays with smaller diameters. The photocatalysis experiments showed that the nanotube structure was beneficial for the photocatalytic degradation of Rhodamine B; however, TiO2 nanotubes with smaller diameters displayed decreased catalytic activity.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Magnetic nanocomposite based on functionalized salep as a green support
           for immobilization of palladium nanoparticles: Reusable heterogeneous
           catalyst for Suzuki coupling reactions
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Ali Pourjavadi, Anahita Motamedi, Zohreh Marvdashti, Seyed Hassan Hosseini
      The synthesis and catalytic behavior of palladium loaded magnetic nanocomposite based on natural polysaccharide salep modified with poly (amino pyridine) is described. The synthesized support is loaded with relatively large amounts of palladium ions (0.34mmol g−1). This is a simple, ecologically safe and cost-effective route for the preparation of the novel heterogeneous catalyst that shows high activity for Suzuki coupling reactions under remarkably mild conditions. Furthermore, the prepared catalyst is magnetically recovered and effectively reused for seven cycles of reactions without significant loss of its catalytic activity and loaded palladium nanoparticles.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Enhanced onset potential NiMn-decorated activated carbon as effective and
           applicable anode in urea fuel cells
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Nasser A.M. Barakat, Mohannad Alajami, Yazan Al Haj, M. Obaid, Saeed Al-Meer
      Basically, to be used as an anode in the air-cathode fuel cells, the onset potential of the introduced material should be lower than the ORR potential. Unfortunately, especially in the field of urea fuel cells, most of the reported electrocatalysts do not own this very important feature. NiMn nanoparticles-decorated activated carbon is introduced as strongly enhanced onset potential and highly effective electrocatalyst for urea oxidation. For bimetallic nanoparticles having 10wt% Mn, the corresponding onset potential is ˗85mV (vs. Ag/AgCl) with a corresponding current density of 130mA·cm−2. However, other contents (0, 20 and 30wt%) of Mn do not show this high improvement in the electrocatalytic activities. Decoration of the activated carbon can be achieved by hydrothermal treatment of the metals acetates/activated carbon aqueous suspension followed by fast cooling to perform sudden transformation of the subcritical water to a normal one. Later on, the powder is sintered in argon atmosphere at 850°C. Fortunately, the characterizations confirmed that the modified activated carbon is decorated by pristine NiMn nanoparticles rather than the expected oxides.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • CuTi LDH derived NH3-SCR catalysts with highly dispersed CuO active phase
           and improved SO2 resistance
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Yu Nie, Qinghua Yan, Sining Chen, Dermot O'Hare, Qiang Wang
      Dispersed CuyTi1Ox catalysts derived from Cu-Ti-CO3 layered double hydroxides (LDHs) were successfully prepared. Due to the better dispersion of active CuO phase, the optimal catalyst Cu1Ti1Ox reached a high NO x conversion of 88.9% at 200°C, which is significantly higher than that of the control catalyst 10wt% CuO/TiO2 (29.5%). Cu1Ti1Ox catalyst also showed improved SO2 resistance, with a very stable NO x conversion of 76.4% at 200°C after 8h running with 50ppm SO2, much higher than that of 10wt% CuO/TiO2 (3.3%). The reaction mechanism was discussed with NH3-TPD and H2-TPR analyses, which indicated that Cu1Ti1Ox has more surface acidic sites and higher redox property than 10wt% CuO/TiO2. In all, CuyTi1Ox prepared from Cu-Ti LDH precursor can work as highly efficient and SO2 resistant low-temperature NH3-SCR catalyst for NO x removal.

      PubDate: 2017-04-17T02:16:45Z
       
  • High-performance Ag-CuOx nanocomposite catalyst galvanically deposited
           onto a Ni-foam for gas-phase dimethyl oxalate hydrogenation to methyl
           glycolate
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Yanfei Chen, Lupeng Han, Jian Zhu, Pengjing Chen, Songyu Fan, Guofeng Zhao, Ye Liu, Yong Lu
      A foam-structured Ag-CuOx nanocomposite catalyst obtained by sequential galvanic-deposition of 0.4wt% Ag and 28wt% Cu onto a Ni-foam, is highly active, selective and stable for the gas-phase hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG). The best catalyst 0.4-Ag-28-CuOx/Ni-foam was capable of converting more than 96% DMO into MG with a high selectivity of more than 96% and was stable for at least 200h at 210°C and a WLHSVDMO of 0.25h−1 for a feed of 13wt% DMO dissolved in MeOH. Silver is responsible to apportion the proportion of Cu+ and Cu0 to an appropriate scale of optimal potency for converting DMO-to-MG.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Relationship of basicity and hydrogen bond properties of ionic liquids
           with its catalytic performance: Application to synthesis of propylene
           glycol methyl ether
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Shengxin Chen, Ruixia Liu, Yajing Li, Ruirui Zhang, Cong Zhao, Hongguo Tang, Congzhen Qiao, Suojiag Zhang
      The relationship of basicity and hydrogen bond with catalytic performance was investigated in synthesis of propylene glycol methyl ether (PGME) catalyzed by various ILs ([Emim][OAC], [Bmim][OAC], [N2222][OAC], [EtOHN111][OAC], [N4444]Br, [Bmim][N(CN)2], [Bmim]Br, [Bmim][PF6]). The basicity and Kamlet-Taft parameters of each catalyst were evaluated by UV–visible spectroscopy. It was found the catalytic performance is the synergistic effect of basicity and hydrogen bond donating ability in the synthesis of PGME from PO and CH3OH, which is quite different from the conventional basic catalytic mechanism.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • The Pd-catalysed hydromethoxycarbonylation of aliphatic internal alkenes
           with minimal double bond isomerisation
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Tyler Bredenkamp, Cedric Holzapfel
      The methoxycarbonylation of internal alkenes by a palladium(II)complex comprising PdCl2, bis(2-methoxyphenyl)phenylphosphine (2) and HCl has been investigated. The results presented herein demonstrate a non-isomerizing Pd-complex for the effective production of internal esters from the corresponding internal aliphatic alkenes. Selectivities of >70% were obtained for the desired internal esters with no signs of catalyst decomposition. The high selectivity for the internal esters is rationalized on the basis of the hemi-lability of the o-methoxy moiety which may assist in ligand dissociation. To the best of our knowledge this is one of the first reported hydromethoxycarbonylation routes to internal esters from their corresponding internal aliphatic alkenes.

      PubDate: 2017-04-17T02:16:45Z
       
  • Selective production of carvacrol from carvone over supported Pd catalysts
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Pedro Benavente, Fernando Cárdenas-Lizana, Mark A. Keane
      The selective conversion of biomass-derived carvone in H2 was studied over (Al2O3, C and CeO2) supported Pd (mean size 2.8–3.0nm), taking bulk Pd as benchmark. 100% carvacrol yield was achieved over Pd/Al2O3, Pd/C and bulk Pd at an inlet H2/carvone=1/6, with appreciably higher rates for the supported catalysts. Carveol formation over Pd/CeO2 was attributed to CO activation at surface oxygen vacancies (confirmed by O2 titration) generated during TPR. Carvotanacetone and carvomenthone formation were observed at H2/carvone>1/6.

      PubDate: 2017-04-10T02:04:49Z
       
  • Heterogeneous esterification of fatty acids with methanol catalyzed by
           Lewis acidic organozirconium complexes with Keggin-type
           mono-aluminum-substituted polyoxotungstates
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Chika Nozaki Kato, Tsukasa Ogasawara, Akari Kondo, Daichi Kato
      Two Lewis acidic organozirconium complexes with α-Keggin-type mono-aluminum-substituted polyoxotungstates, [(n-C4H9)4N]6[α-PW11Al(OH)O39ZrCp2]2 (Cp= η 5-C5H5 −) (TBA-P-Al-Zr) and [(n-C4H9)4N]6[α-SiW11Al(OH)2O38ZrCp2]2·2H2O (TBA-Si-Al-Zr), were used as heterogeneous catalysts for the esterification of various fatty acids with methanol. For the esterification of linoleic acid at 80±2°C, TBA-P-Al-Zr exhibited 83% conversion after 6h, approximately six times higher than that of TBA-Si-Al-Zr. TBA-P-Al-Zr also exhibited 69–90% conversion for the esterification of oleic acid, palmitic acid, myristic acid, and lauric acid with methanol at 80±2°C.

      PubDate: 2017-04-10T02:04:49Z
       
  • Facile fabrication and efficient photoelectrochemical water-splitting
           activity of electrodeposited nickel/SiC nanowires composite electrode
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Min Jiang, Zhaoxiang Liu, Lijuan Ding, Jianjun Chen
      The nickel-SiC nanowires composite electrode with high photoelectrocatalytic activity for water splitting in alkaline solution was fabricated via constant current electrodeposition. Compared with pristine SiC nanowires, this photocathode with a three-dimensional porous structure produced a current density of −32.4mAcm−2 at 1.4V vs. Ag/AgCl. The enhanced performance was ascribed to efficient photogenerated carriers separation resulting from the heterostructure interface of Ni metal and SiC semiconductor. Moreover, this photocathode showed high stability in KOH solution over 600s' continuous reaction, which suggests a promising application in alkaline conditions for photocatalysis and PEC water splitting.

      PubDate: 2017-04-10T02:04:49Z
       
  • Visible-light-driven heterojunction photocatalysts based on g-C3N4
           decorated La2Ti2O7: Effective transportation of photogenerated carriers in
           this heterostructure
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Fangzhi Wang, Wenjun Li, Shaonan Gu, Hongda Li, Xintong Liu, Chaojun Ren
      Lanthanide titanate (La2Ti2O7) with strong reduction-oxidation ability has been regarded as a new promising photocatalyst. To boost its photocatalytic activity, g-C3N4/La2Ti2O7 composites were designed and constructed. The results reveal that La2Ti2O7 nanosheets were well attached to the surface of g-C3N4 and the composites had good visible-light absorption properties. Significantly, compared to pure La2Ti2O7 and g-C3N4, the composites exhibited outstanding photocatalytic performance under visible-light irradiation. The enhanced photocatalytic activity could be derived from the effective transportation of photogenerated electrons from g-C3N4 to La2Ti2O7. The electrons with high reduction ability can generate more active species to participate in the photodegradation reaction.
      Graphical abstract image

      PubDate: 2017-04-10T02:04:49Z
       
  • Enhanced catalytic oxidation performance of F-Ti-MWW through the
           synergistic effect of anion and cation
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Xiangqing Fang, Le Sun, Longfei Lin, Lizhi Wu, Yueming Liu
      The catalytic performance of F-Ti-MWW towards the epoxidation of 1-hexene with H2O2 was enhanced dramatically, which was attributed to the synergistic effects between anion and cation in the inorganic salt. The negative influence of F− in the SiO4/2F− units was eliminated selectively by convenient anion-exchange and cation-neutralize with various alkali chlorides.

      PubDate: 2017-04-10T02:04:49Z
       
  • Enhancing alkane oxidation using Co-doped SnO2 nanoparticles as catalysts
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Telma F.S. Silva, António J. Silvestre, Bruno G.M. Rocha, Manuel R. Nunes, Olinda C. Monteiro, Luísa M.D.R.S. Martins
      A novel eco-friendly KA oil synthesis at room temperature (up to 25% yield) via solvent-free cyclohexane oxidation using Sn1− x Co x O2− δ (x =0, 0.01 or 0.05) nanoparticles as catalyst (TON up to 2×103) is here reported. These nanoparticles are the first SnO2-based material able to catalyze the oxidation of alkanes. The most active nanocatalyst was the Sn0.95Co0.05O2− δ , allowing an easy recovery and reuse, at least for five consecutive cycles, maintaining high selectivity concomitant with 92% of its initial activity.

      PubDate: 2017-04-03T04:46:49Z
       
  • Oxidative coupling of methane in solid oxide fuel cell tubular membrane
           reactor with high ethylene yield
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Kefeng Liu, Jing Zhao, Di Zhu, Fei Meng, Fanhua Kong, Yongchun Tang
      A Mn-Ce-Na2WO4/SiO2 catalyst integrated solid oxide fuel cell tubular membrane reactor design is developed for oxidative coupling of methane (OCM). The OCM reaction carried out using the tubular membrane reactor establishes both superb hydrocarbon selectivity and outstanding ethylene-to-ethane ratio over the conventional fixed bed OCM or the button cell reactor. A remarkable performance of 60.7% methane conversion with 41.6% C2+ selectivity, 5.8 ethylene-to-ethane ratio and 19.4% ethylene yield is achieved using the tubular membrane reactor and the Mn-Ce-Na2WO4/SiO2 catalyst, demonstrating considerable advantages over conventional OCM.

      PubDate: 2017-04-03T04:46:49Z
       
  • Lignin based synthesis of graphitic carbon-encapsulated iron nanoparticles
           as effective catalyst for forming lower olefins via Fischer-Tropsch
           synthesis
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Hengfei Qin, Bin Wang, Chunyong Zhang, Binglong Zhu, Yue Zhou, Quanfa Zhou
      Graphitic-carbon-encapsulated iron nanoparticles were prepared from anti-programmed temperature flash pyrolysis, in which bio-renewable lignin and ferric nitrate were used as precursors. The resulting iron nanoparticles contain 9-nm-diameter metal cores that are wrapped in a few layers of graphitic carbon. Due to the peculiar structural characteristics, the Fe@C catalyst shows desirable selectivity of 52.4% to C2 C4 olefins and high stability in the Fischer-Tropsch synthesis. All the experimental data indicate this unique structure provides an excellent confinement effect and prevents nanoparticle aggregation during the catalysis.

      PubDate: 2017-04-03T04:46:49Z
       
  • Solventless esterification of fatty acids with trimethylolpropane using
           sulfonated amorphous carbons derived from wood powder
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Dasom Mun, Anh Thi Hoang Vo, Bora Kim, Yong-Gun Shul, Jin Ku Cho
      Polyolesters synthesized by an esterification between polyols and fatty acids are value-added oleochemicals widely used as lubricants, cosmetics, and food additives among other applications. However, homogeneous acid catalysts are still preferred in their industrial production, despite their associated energy cost and the environmental issues that they present. In this paper, we describe lignocellulose-derived amorphous carbons with a high loading level of SO3H and their application to the synthesis of polyolesters as a biobased heterogeneous acid catalyst. These sulfonated amorphous carbons could be readily prepared via (i) heat treatment at 400°C for 1h and (ii) sulfonation with chlorosulfuric acid. XRD and BET analyses demonstrated that these carbonaceous materials were not crystalline but were amorphous structures with a low surface area. The attachment of SO3H groups was confirmed by FT-IR and XPS, and the loading level of SO3H was determined by CHNS elemental analysis. Chlorosulfuric acid gave a higher loading level of SO3H than other sulfating agents, such as conc. sulfuric acid and fuming sulfuric acid. The higher SO3H-loaded amorphous carbons exhibited a greater catalytic activity for esterification between trimethylolpropane and fatty acids under solventless conditions. Esterification of oleic acid derived from vegetable oil with trimethylolpropane using this catalyst afforded the desired biolubricant at over 93% yield in 3h. The sulfonated amorphous carbons could be reused three times without any significant loss of catalytic activity.
      Graphical abstract image

      PubDate: 2017-04-03T04:46:49Z
       
  • CO2 photocatalytic reduction over Pt deposited TiO2 nanocrystals with
           coexposed {101} and {001} facets: Effect of deposition method and Pt
           precursors
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Zhuo Xiong, Ze Lei, Xiaoxiang Chen, Bengen Gong, Yongchun Zhao, Junying Zhang, Chuguang Zheng, Jeffrey C.S. Wu
      In this paper, Pt nanoparticles were deposited on TiO2 nanocrystals with coexposed {101} and {001} facets by photodeposition and chemical reduction methods using H2PtCl6 or Pt(NH3)4Cl2 as precursors, respectively. The deposition method and Pt precursors exhibited great influence on the particle size, distribution, and chemical states of Pt nanoparticles, which further affected the recombination of photogenerated charges. The Pt/TiO2 catalyst prepared by chemical reduction of H2PtCl6 had the highest H2 and CH4 yield of 9.9 and 4.6μmolg−1 h−1, resulting from the lowest recombination rate of photogenerated charges caused by the high Pt0/PtII ratio and homogeneous distribution of Pt nanoparticles over TiO2 facets.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Immobilization of catalytically active polyoxotungstate into ionic
           liquid-modified MIL-100(Fe): A recyclable catalyst for selective oxidation
           of benzyl alcohol
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Sara Abednatanzi, Alireza Abbasi, Majid Masteri-Farahani
      A new polyoxometalate-based catalyst, PW4/DAIL/MIL-100(Fe), was prepared by the immobilization of peroxopolyoxotungstate (PW4O24 3−, PW4) into the nanocages of dual amino-functionalized ionic liquid (DAIL)- modified MIL-100(Fe) framework. The catalytic behavior of the resulting material was evaluated in the oxidation of benzyl alcohol using TBHP as the oxidant. Moreover, the catalytic performance of PW4/DAIL/MIL-100(Fe) was compared with that of the DAIL free catalyst (HPW4/MIL-100(Fe)). In comparison with the HPW4/MIL-100(Fe) material, the PW4/DAIL/MIL-100(Fe) showed an enhanced catalytic performance in the selective oxidation of benzyl alcohol due to the ability of DAIL groups to form hydrogen bonds and enhancing the accessibility of TBHP.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • C-S cross-coupling of aryl halides with alkyl thiols catalyzed by in-situ
           generated nickel(II) N-heterocyclic carbene complexes
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Fang-Jie Guo, Jing Sun, Zhao-Qing Xu, Fritz E. Kühn, Shu-Liang Zang, Ming-Dong Zhou
      The C-S cross-coupling of aryl halides with alkyl thiols catalyzed by in-situ generated Ni (II) N-heterocyclic carbene (NHC) complexes is investigated. Good to excellent yields can be obtained for a variety of aryl halides when using 5mol% of the Ni (II)-NHC catalyst and 1.5eq. of KOtBu. Both the electronic and steric effects of the NHC ligands on the catalytic performance of Ni (II)-NHC, as well as the electronic effects of aryl halides on coupling reactivity are examined. The mechanism for Ni (II)-NHC catalyzed coupling reactions is also discussed.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Liquid phase propylene oxidation with tert-butyl hydroperoxide over
           titanium containing wrinkled mesoporous silica
    • Abstract: Publication date: June 2017
      Source:Catalysis Communications, Volume 96
      Author(s): Zijie Wang, Kenneth J. Balkus
      Titanium containing wrinkled mesoporous silica (Ti-WMS) was prepared by direct synthesis and showed unique conical pores with wrinkled pore walls. The pores of this type of titanosilicate radiate from the center of each particle to the surface of the sphere with gradually increased pore size. These catalysts showed superior performance over traditional Ti-MCM-41 for liquid phase propylene oxidation with tert-butyl hydroperoxide as the oxidant in a batch reactor.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Morphology effect of nanostructure ceria on the Cu/CeO2 catalysts for
           synthesis of methanol from CO2 hydrogenation
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Bi Ouyang, Weiling Tan, Bing Liu
      Three kinds of CeO2 with different nanostructures were prepared by a controlled hydrolysis method, and Cu/CeO2 catalysts were prepared by an incipient wetness impregnation method. The catalytic activity of Cu/CeO2 catalysts was evaluated by the methanol synthesis from CO2 hydrogenation. It was observed that the support morphology greatly affected the activity and selectivity of methanol synthesis from CO2 hydrogenation. The nanorod CeO2 supported Cu/CeO2 catalyst by the exposure of (100) and (110) faces showed the strongest interaction between CuO and CeO2, highest CuO dispersion and the highest catalytic activity with methanol yield of 1.9% at 240°C and 2MPa.

      PubDate: 2017-03-27T03:03:23Z
       
  • Preparation of leaflike copper phosphate films by anodic oxidation and
           their catalytic oxidation performance
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Hongli Hu, Xixin Wang, Liyuan Gong, Xiaofei Yu, Xiaojing Yang, Jianling Zhao
      In this paper, leaflike copper phosphate films were fabricated by anodization of copper foils in mixed phosphate electrolytes. The optimal leaflike morphology was obtained when copper foil was anodized at 10V for 60min. Leaflike copper phosphate films had very good catalytic effect on the dyes degradation through Fenton oxidation. The reaction temperature exerted a significant influence on the decolorization ratio. When the temperature was 75°C, methyl orange, rhodamine B, alizarin red and neutral red solution could be decolorized completely within 5min (10g dye solution/4cm2 film).
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Ferrocene as an efficient and recyclable heterogeneous catalyst for
           catalytic ozonation in water
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Kun-Yi Andrew Lin, Tien-Yu Lin, Yu-Chien Chen, Yi-Feng Lin
      Heterogeneous catalytic ozonation is a promising technique to improve ozonation for degrading organic contaminants. Preparation of heterogeneous catalysts (e.g., substrate-supported metals and metal oxides) for ozonation typically involves multiple steps and reagents. Because iron (Fe) is an abundant and non-noble metal, Fe-based heterogeneous catalysts are attractive for ozonation. Therefore, it is critical to develop a readily-available, stable and non-toxic Fe-based heterogeneous catalyst. To this end, we propose ferrocene (Fc), consisting of two cyclopentadienyl rings bound on opposite sides of a central Fe2+ atom, as a catalyst for ozonation. Degradation of the toxic dye amaranth was employed as a model test. The presence of Fc significantly improved amaranth degradation extent and kinetics, and Fc did not adsorb amaranth in water. Factors influencing amaranth degradation were investigated including Fc and ozone dosages, temperature, pH, and addition of NaCl and humic acid. Effects of radical inhibitors were also examined to provide insights into the occurrence of radical species during Fc-catalyzed ozonation. Degradation of amaranth was primarily attributed to derivative reactive oxygen species, as well as direct degradation by ozone to a lesser extent. A pathway of amaranth degradation is proposed based on degradation intermediates detected using LC/MS/MS. Fc was also re-used over multiple cycles for catalyzing ozonation to degrade amaranth without a loss of efficiency. These results indicate that Fc is a promising commercially available nanoscale heterogeneous catalyst for catalytic ozonation.

      PubDate: 2017-03-27T03:03:23Z
       
  • Pd9Ag1-N-doped-MOF-C: An efficient catalyst for catalytic transfer
           hydrogenation of nitro-compounds
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Zong Liu, Wenhuan Dong, Saisai Cheng, Shuang Guo, Ningzhao Shang, Shutao Gao, Cheng Feng, Chun Wang, Zhi Wang
      In this study, N-doped porous carbon (denoted as N-doped-MOF-C) was prepared by one-step carbonization of metal organic framework material, NH2-MIL-125. Pd and Ag nanoparticles were immobilized on the N-doped-MOF-C through co-reduction method with NaBH4 as reductant. The results indicated that Pd9Ag1-N-doped-MOF-C catalyst exhibited excellent catalytic activity and selectivity for the catalytic transfer hydrogenation of nitroarenes using formic acid as the renewable hydrogen donor. The high catalytic activity of the catalyst can be attributed to the synergetic interaction between the support and the highly dispersed Pd and Ag metal nanoparticles.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Hemilabile N-heterocyclic carbene (NHC)-nitrogen-phosphine mediated Ru
           (II)-catalyzed N-alkylation of aromatic amine with alcohol efficiently
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Xiao-Jun Yu, Hai-Yu He, Lei Yang, Hai-Yan Fu, Xue-Li Zheng, Hua Chen, Rui-Xiang Li
      Based on the hemilability, a novel N-heterocyclic carbene (NHC)-nitrogen-phosphine ligand (1) was synthesized, and the combination of it with [Ru(COD)Cl2]n showed the high activity and selectivity with a low Ru loading of 0.1% for the N-alkylation of amine with alcohol. Especially, for these substrates with pyridine backbone, even if the catalyst loading was as low as 0.01%, good yields (81–95%) of the desired products were achieved.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Enhanced ethylene productivity by the promotion of lattice oxygen in
           NiNbO/CexZr1−xO2 composite for oxidative dehydrogenation of ethane
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Minzae Lee, Yang Sik Yun, Jongbaek Sung, Joongwon Lee, Young-Jong Seo, In Kyu Song, Jongheop Yi
      NiNbO/CexZr1−xO2 catalysts are developed for the enhancement in the ethylene productivity via oxidative dehydrogenation of ethane (ODHE) reaction. Compared with the conventional manner of using NiNbO alone, the introduction of CexZr1−xO2 to the NiNbO active catalyst contributes on suppressing the formation of byproducts (CO, CO2, and CH4) at relatively high reaction temperature (450°C). The increased reaction temperature also leads to an enhancement of ethane conversion (~55%) and subsequent increase in the production of ethylene (6.3μmolgactive cat −1 s−1), compared to that of conventional NiNbO catalyst (1.5μmolgactive cat −1 s−1). The promotion effect of CexZr1−xO2 additive is also discussed.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • In situ regeneration of Rhodium in three-way catalysts by aqueous ethanol
           injection for sustained methane emissions abatement
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Qinghe Zheng, Robert Farrauto
      We are reporting an initial feasibility study addressing the abatement of methane emissions from stoichiometric natural gas fueled vehicles. The injection of a small amount of aqueous ethanol or propane into the exhaust enables the catalytic abatement of methane by the Rh-containing three-way catalyst (TWC). The Rh component experiences oxidation to inactive Rh3+ when the engine operates during the fuel shutoff mode raising the catalyst temperature to over 1000°C. Upon returning to normal driving operation, under a slightly fuel rich condition, the methane will not reform leading to permanent deactivation of the Rh. Injecting an aqueous ethanol solution or gaseous propane catalytic steam reforming occurs and the H2 generated reduces the Rh3+ to its metallic and active state for CH4 steam reforming. This paper presents a laboratory feasibility study for in situ catalyst regeneration of Rh3+ to Rh metal using a secondary injected fuel (ethanol or propane), enabling sustained catalyst performance in methane emissions abatement.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Simple preparation of MgO/g-C3N4 catalyst and its application for
           catalytic synthesis of dimethyl carbonate via transesterification
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Jie Xu, Ye Chen, Dan Ma, Jie-Kun Shang, Yong-Xin Li
      Graphitic carbon nitride (g-C3N4) was employed as a catalyst support to load MgO. The physicochemical properties of the supported catalyst (MgO/g-C3N4) were characterized using several characterization techniques, including XRD, FT-IR, SEM, XPS and CO2-TPD. The incorporation of MgO has effectively enhanced the overall basicity of g-C3N4. In the transesterification of ethylene carbonate (EC) with methanol to dimethyl carbonate (DMC), MgO/g-C3N4 catalysts demonstrated high catalytic activity and good recyclability, affording the maximum DMC yield of 70% at 140°C. Moreover, the catalytic performance has also been compared with other reported heterogeneous catalysts.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Simultaneous photocatalytic and catalytic activity of p–n junction
           NiO@anatase/rutile-TiO2 as a noble-metal free reusable nanoparticle for
           synthesis of organic compounds
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Abolfazl Ziarati, Alireza Badiei, Ghodsi Mohammadi Ziarani, Hamed Eskandarloo
      Photocatalytic and catalytic activity of NiO loaded on mixture of anatase/rutile phases of TiO2 nanoparticles were investigated for some organic reactions including selective oxidation of alcohols, synthesis of benzimidazoles and preparation of imines at room temperature. The p–n junction formed between NiO and TiO2 as well as difference between band gaps in anatase/rutile phases facilitated electron transfer to TiO2 and successfully promoted synthesis of compounds. The use of a reusable photocatalyst without noble metal co-catalysts, along with the mild reaction conditions and use of light energy, make this method as an environmentally benign and energy saving chemical procedure.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Non-heme iron(III) complex with tridentate ligand: Synthesis, structures
           and catalytic oxidations of alkanes
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Nidhi Tyagi, Ovender Singh, Kaushik Ghosh
      We report synthesis and characterization of a mononuclear iron(III) complex [Fe(LH 2 )Cl2]+, 1 having tridentate ligand LH 2 and their application in oxidation of alkanes. Complex, 1 was characterized by various analytical, spectroscopic, electrochemical, crystallographic and theoretical studies. The molecular structure determination showed the presence of distorted square pyramidal FeN3Cl2 coordination sphere. Selective oxidation of benzyl alcohol, fluorene, adamantane, 1-phenyl ethanol and n-octane in presence of catalytic amount [FeIII(LH 2 )Cl2]+ with H2O2 under mild conditions give products in good to excellent yields through FeIV O intermediate. Several studies were done to support the reactive intermediate. Generation of FeIV O intermediate was also supported by UV–visible titration of [FeIII(LH 2 )Cl2]+ and H2O2 at low temperature and their visual colour change from red (500nm, ɛ=1050M−1 cm−1) to green (770nm, ɛ=153M−1 cm−1).

      PubDate: 2017-03-27T03:03:23Z
       
  • {Mo72Cr30} nanocluster as a novel self-separating catalyst for hydrogen
           peroxide olefin epoxidation
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Abdolreza Rezaeifard, Maasoumeh Jafarpour, Reza Haddad, Fahimeh Feizpour
      Phase-transfer catalytic epoxidation activity of nanosized {Mo72Cr30} Keplerate polyoxometalate in ethanol in the presence of hydrogen peroxide is exploited. The nanocluster acts as a homogeneous catalyst upon treatment with hydrogen peroxide, while it can be easily filtered and reused as a heterogeneous catalyst. The high catalytic activity and durability of catalyst was demonstrated.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Effect of Ti loading on structure-activity properties of Cu-Ni/Ti-MCM-41
           catalysts in hydrodeoxygenation of guaiacol
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): S.B. Abd Hamid, Murtala M. Ambursa, Putla Sudarsanam, Lee Hwei Voon, Suresh K. Bhargava
      Various Cu-Ni/Ti-MCM-41 catalysts by varying Ti amount (Ti/Si=10, 20 and 30%) were synthesized for hydrodeoxygenation of guaiacol and characterized by XRD, N2 adsorption-desorption, NH3-TPD, H2-TPR and Raman spectroscopy. The Ti loading shows an adverse effect on the catalyst surface area. But, more number of acidic sites (5173.55μmol/g) were found for 20% Ti loaded Cu-Ni/Ti-MCM-41 catalyst. The 20% Ti loaded Cu-Ni/Ti-MCM-41 catalyst shows a high guaiacol conversion (74.2%) and cyclohexane selectivity (48.81%) which is due to abundant acid and redox sites: acid sites initiate removal of oxygen via dehydration, while hydrogenation of guaiacol to cyclohexane is promoted by redox sites.
      Graphical abstract image

      PubDate: 2017-03-27T03:03:23Z
       
  • Coupling of ortho-chloronitrobenzene hydrogenation with 1,4-butanediol
           dehydrogenation over CuMgO catalysts: A hydrogen free process
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Kannapu Hari Prasad Reddy, Young-Woong Suh, Narani Anand, Burri David Raju, Kamaraju Seetha Rama Rao
      Aiming at an efficient method for the hydrogenation of o-chloronitrobenzene to o-chloroaniline under hydrogen free environment, the reaction was coupled with 1,4-butanediol dehydrogenation over CuMgO catalysts containing various amounts of copper loadings (5–20wt%). o-Chloroaniline and γ-butyrolactone were the main products with the yield of 85% and 90%, respectively. The main advantage of the coupling process was that the hydrogenation reaction was conducted at the lower temperature (523K) without external hydrogen supply when compared to the independent hydrogenation (648K). Catalysts were characterized using various analytical techniques such as BET, XRD, N2O pulse chemisorption, TPR-H2, XPS and CHNS analysis. From N2O characterization results, it was found that 10wt% CuMgO catalyst containing more surface Cu species (Cu0/Cu+1) showed a superior performance in the coupling process.
      Graphical abstract image

      PubDate: 2017-03-13T01:51:47Z
       
  • Ammonia formation from nitric oxide over Pd-based catalysts in
           multicomponent feed gas compositions
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Emma Catherine Adams, Magnus Skoglundh, Per-Anders Carlsson
      Using multicomponent gas feeds, the formation of ammonia from nitric oxide over Pd/Al2O3 and Pd/Ce/Al2O3 model catalysts was compared to that of a commercially-available three-way catalyst. Steady-state oxygen-sweep experiments show that the highest activity for ammonia formation is obtained over the Pd/Ce/Al2O3 catalyst whilst the lowest activity is observed for the three-way catalyst. The latter is considered to be linked to the incorporation of rhodium, a component that promotes the NO x reduction selectivity towards N2. Also, lean/rich cycling experiments were carried out to simulate the cycling conditions that passive-SCR after treatment systems depend upon. High activity is again seen over the Pd/Ce/Al2O3 catalyst during short periodic switches. For the three-way catalyst, longer periodic switches are required for the onset of ammonia formation due to the high oxygen storage capacity of this sample as compared to the other two. Hence, a future direction of investigation could be to develop materials with equivalent water-gas shift properties of ceria, but with reduced oxygen storage capacity so as to provide hydrogen for reaction without incurring a significant delay in ammonia formation.
      Graphical abstract image

      PubDate: 2017-03-13T01:51:47Z
       
  • Well-organized Co-Ni@NC material derived from hetero-dinuclear MOFs as
           efficient electrocatalysts for oxygen reduction
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Jilan Long, Rong Li, Xinglong Gou
      We reported a novel Co-Ni@NC nanocatalysts derived from a new N-containing hetero-dinuclear Co-Ni-ZIF [CoNi(MIM)2]. The Co-Ni@NC alloy nanocatalysts showed well-defined frameworks and interconnected porous structure. Characterization results manifested that all elements were uniform distributed in catalysts. The Co-Ni alloy nanoparticles were wrapped by a highly ordered graphitic structure, leading to a high dispersion of metal active centres. When used as ORR catalysts, the optimal Co-Ni(1:1)@NC-900 showed the best catalytic activity, the activity of which were much higher than that of monometallic catalysts and almost equal to that of Pt/C catalysts. Moreover, it also showed an excellent stability and durability.
      Graphical abstract image

      PubDate: 2017-03-13T01:51:47Z
       
  • A reliable power-law type kinetic expression for PROX over Pt-Sn/AC under
           fully realistic conditions
    • Abstract: Publication date: Available online 11 March 2017
      Source:Catalysis Communications
      Author(s): B. Merve Eropak, A. Erhan Aksoylu
      The current experimental work is on PROX kinetics over Pt-Sn/AC catalyst at 383K in the presence of H2, CO2, H2O and CH4, mimicking WGS outlet of a fuel processor, which is used in production of PEMFC-grade H2 from hydrocarbons. Parameters of the power-law kinetic model were estimated to be used in PROX reactor modeling and design calculations; reaction orders with respect to CO and O2 were found as 0.47 and (−0.57). The apparent activation energy of PROX over Pt-Sn/AC, was calculated as 45,300Jmol−1 in the temperature range of 383–403K.

      PubDate: 2017-03-13T01:51:47Z
       
  • Improving the visible-light photocatalytic activity of interstitial
           
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Yuwei Ma, Lu Han, Huiyan Ma, Junzhong Wang, Juming Liu, Lin Cheng, Jucai Yang, Qiancheng Zhang
      Interstitial carbon-doped anatase TiO2 with bidentate carboxylate ligands (A-C/TiO2) has been prepared through a novel vapour-assisted solvothermal approach and subsequent low temperature calcination process. The bidentate carboxylate ligands could not only strengthen the interaction between the interstitial carbon dopants and TiO2 lattice to narrow the bandgap and enhance the visible-light absorption, but also give rise to the positive shift of the VB edge and cause further bandgap narrowing by inducing the band tail states above the VB edge. These synergistic effects could significantly improve the visible-light photocatalytic activities of interstitial carbon-doped TiO2 on phenol and MO degradation.

      PubDate: 2017-03-08T09:51:47Z
       
  • Highly selective aerobic oxidation of alcohols to aldehydes over a new
           Cu(II)-based metal-organic framework with mixed linkers
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Sheng-Chun Chen, Sheng-Nan Lu, Feng Tian, Nan Li, Han-Yu Qian, Ai-Jun Cui, Ming-Yang He, Qun Chen
      A new Cu(II)-based metal-organic framework {[Cu2(1,2-BDC)2(Fbtx)2]·3H2O} n (denoted as Cu-FMOF, CCDC-1519440, 1,2-BDC=1,2-benzenedicarboxylate, Fbtx=1,4-bis(1,2,4-triazole-1-ylmethyl)-2,3,5,6-tetrafluorobenenze) was hydrothermally synthesized and structurally characterized. The Cu-FMOF exhibits a 3D 4-connected coordination framework with the extremely rare (65·8)-hxg-d-4-P2/c topology. Using air as the oxidant, the crystalline Cu-FMOF could be used as a highly efficient heterogeneous catalyst for the TEMPO-assisted oxidation of alcohols to aldehydes. Furthermore, the Cu-FMOF catalyst could be easily recovered and reused for several times without a significant loss of catalytic activity or structural deterioration.
      Graphical abstract image

      PubDate: 2017-03-08T09:51:47Z
       
  • Immobilisation of catalytically active proline on H2N-MIL-101(Al)
           accompanied with reversal in enantioselectivity
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Sandra Nießing, Constantin Czekelius, Christoph Janiak
      Proline-functionalized H2N-MIL-101(Al) was synthesized from l- or d-proline-terephthalic acid and used in the catalytic aldol reaction of p-nitrobenzaldehyde with acetone to achieve up to 95% conversion and an ee-value of 29% but in a reversal in enantioselectivity compared to the reaction under homogeneous l- or d-proline organocatalytic condition.
      Graphical abstract image

      PubDate: 2017-03-08T09:51:47Z
       
  • Gas-phase dehydration of glycerol over hierarchical silicoaluminophosphate
           SAPO-40
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Auguste Fernandes, M. Filipa Ribeiro, João P. Lourenço
      Hierarchical silicoaluminophosphate SAPO-40 was synthetized using an organosilane acting as additional porogen agent. The structural, textural and acid properties of the new material were evaluated using XRD, 29Si and 27Al MAS NMR, SEM, N2 adsorption, pyridine adsorption followed by IR spectroscopy and thermal analyses. The evaluation of the catalytic performance in the dehydration of glycerol has evidenced a high activity and a very low deactivation rate. When compared with the conventional SAPO-40, this catalyst shows higher acrolein selectivity and a significantly longer catalytic lifetime.
      Graphical abstract image

      PubDate: 2017-03-08T09:51:47Z
       
  • Enhancement of washcoat adhesion for SCR catalysts to convert nitrogen
           oxide using powder spray coating of TiO2 on metallic honeycomb substrate
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Jiseop Hwang, Ho-Jung Ha, Jungho Ryu, Jong-Jin Choi, Cheol-Woo Ahn, Jong-Woo Kim, Byung-Dong Hahn, Woon-Ha Yoon, Heesoo Lee, Joon-Hwan Choi
      A novel powder spray coating method was applied to form intermediate layers on metallic honeycomb substrates to improve the adhesion property of ceramic-based washcoat layer without any binder addition. Washcoating of SCR catalysts for abatement of nitrogen oxides was performed with different numbers of coating and different amounts of washcoat loading. Metallic monoliths with the intermediate layer showed much better washcoat adhesion property than monoliths without the layer even with high washcoat loading. The surface-modified monoliths had better NO conversion performance than the samples without the intermediate layer after ultrasonic vibration test to measure adhesion property of the washcoat layers.
      Graphical abstract image

      PubDate: 2017-02-23T04:03:49Z
       
  • Epoxides as a new feedstock for the synthesis of xanthene derivatives by
           using highly efficient, reusable tungstated zirconia heterogeneous
           catalyst
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Venkata Subba Rao Ganga, Manoj K. Choudhary, Rajkumar Tak, Prathibha Kumari, Sayed H.R. Abdi, Rukhsana I. Kureshy, Noor-ul H. Khan
      This paper reports the synthesis of tungstated zirconia (WO x /ZrO 2 ) by sol-gel technique and its characterization with XRD, FT-IR, Raman, TGA, N2 adsorption–desorption isotherms, NH3-TPD, SEM, and TEM analysis. The catalyst was used for a new one-pot synthesis of biologically active xanthene derivatives (yield up to 94%) by using readily available epoxides and 2-naphthol/sesamol. The catalytic performance of WO x /ZrO 2 was found to be better as compared with other catalysts viz., H3[P(W3O10)4]·xH2O, HPA-zirconia, HPA-MCM-41, Amberlist-15, sulphated silica and sulphated zirconia particularly in terms of recyclability. This method is convenient, rapid, clean, reusable (6cycles) and high yielding reaction for the synthesis of xanthene derivatives.
      Graphical abstract image

      PubDate: 2017-02-23T04:03:49Z
       
  • Lyophilization-based synthesis of HKUST-1 encapsulated molybdenyl
           acetylacetonate nanocrystals: An effective soybean oil epoxidation
           catalyst
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Xin-Li Yang, Yu Zhang
      A novel nanomaterial of MoO2(acac)2 encapsulated in HKUST-1 (MoO2(acac)2@HKUST-1) was conveniently prepared by using the lyophilization method. The material, characterized by several techniques including XRD, N2 physisorption, SEM, FT-IR, XPS UV–Vis DRS and CO-FT-IR, was found to have an enhanced acidity and an additional Lewis acid site different from that in the HKUST-1 crystals. Moreover, the MoO2(acac)2 complexes were uniformly incorporated into the microporous cages of HKUST-1 and the confinement effects provide by the host porous structure significantly decreased the leaching of MoO2(acac)2. As a result, this new catalyst showed efficient catalytic performance and was stable, thus, could be recycled in the epoxidation of soybean oil (SBO) with tert-butyl hydroperoxide (TBHP) as the oxidant in toluene solvent.

      PubDate: 2017-02-23T04:03:49Z
       
  • Cross-linked chitosan supporting polyoxometalates catalyst with adjustable
           redox property for H2O2-based oxidation reactions
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Jingjing Li, Chenjun Zhang, Pingping Jiang, Yan Leng
      A series of polyoxometalates-based chitosan (CS) hybrids was prepared by the anion-exchange of a newly task-specific designed cross-linked CS ionic polymer with a Keggin H3PW12O40. The obtained CS1.5-BPA-PW hybrid can be used as highly efficient solid catalyst for H2O2-based epoxidation of alkenes and oxidation of alcohols, affording high activity and steady catalytic cycles. The unique cross-linked catalyst framework and the appropriate intramolecular electron interaction between amino groups and heteropolyanions play an important role in achieving efficient catalytic performance.
      Graphical abstract image

      PubDate: 2017-02-23T04:03:49Z
       
  • Catalytic hydrosilylation of carbonyl compounds by hydrido thiophenolato
           iron(II) complexes
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Benjing Xue, Hongjian Sun, Qingfen Niu, Xiaoyan Li, Olaf Fuhr, Dieter Fenske
      The hydrosilylation of aldehydes and ketones under mild conditions with hydrido thiophenolato iron(II) complexes [cis–Fe(H)(SAr)(PMe3)4] (1–4) as catalysts is reported using (EtO)3SiH as an efficient reducing agent in the yields up to 95%. Among them complex 1 is the best catalyst. Complex 1 could also be used as catalyst to reduce the α,β-unsaturated carbonyl compounds selectively to the α,β-unsaturated alcohols in high yields.

      PubDate: 2017-02-23T04:03:49Z
       
 
 
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