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  Subjects -> ENGINEERING (Total: 2268 journals)
    - CHEMICAL ENGINEERING (190 journals)
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    - ENGINEERING (1201 journals)
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ENGINEERING (1201 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: 17)
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: 247)
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)
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Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
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Advances in Polymer Science     Hybrid Journal   (Followers: 41)
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Advances in Remote Sensing     Open Access   (Followers: 38)
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)
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Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
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: 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: 6)
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Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
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Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
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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: 7)
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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: 8)
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: 5)
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: 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: 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: 10)
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: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
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: 10)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 25)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 43)
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: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 8)
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: 22)
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: 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: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 266)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 188)
Composites Part B : Engineering     Hybrid Journal   (Followers: 279)
Composites Science and Technology     Hybrid Journal   (Followers: 182)
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Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 7)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)
CTheory     Open Access  

        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  [3048 journals]
  • A chitosan modified Pt/SiO2 catalyst for the synthesis of 3-poly(ethylene
           glycol) propyl ether-heptamethyltrisiloxane applied as agricultural
           synergistic agent
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Huilin Xie, Hangbo Yue, Weixin Zhang, Wenbin Hu, Xinhua Zhou, Pepijn Prinsen, Rafael Luque
      Successful synthesis of 3-poly(ethylene glycol) propyl ether-heptamethyltrisiloxane from hydrosilylation of propenol polyether (HDE) and heptamethyltrisiloxane (MDHM) in the presence of nanoporous silica supported platinum (Pt/SiO2) and its chitosan modified (Pt/CS-SiO2) catalyst is reported. The highest yield obtained was 94% using the Pt/CS-SiO2 catalyst, retaining 96% of its conversion efficiency after six re-utilizations. As an agricultural synergistic agent, the newly synthesized product demonstrates significant improvements on the activity and performance of a commonly used herbicide sprayed on Alternantheria philoxeroides.
      Graphical abstract image

      PubDate: 2017-11-16T02:21:56Z
       
  • A readily available urea based MOF that act as a highly active
           heterogeneous catalyst for Friedel-Crafts reaction of indoles and
           nitrostryenes
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Chengfeng Zhu, Qingqing Mao, De Li, Changda Li, Yiyang Zhou, Xiang Wu, Yunfei Luo, Yougui Li
      A new urea-containing metal-organic framework has been rationally synthesized from a V-shaped dicarboxylate ligand and utilized as hydrogen-bond-donating catalyst, which is highly efficient and recyclable for Friedel-Crafts reaction. The MOF catalyst has the advantages of excellent product yields and a low catalyst loading. Moreover, the catalyst shows a remarkably superior activity compared to its homogenous urea counterparts.
      Graphical abstract image

      PubDate: 2017-11-16T02:21:56Z
       
  • Preparation of hydrothermal carbon as catalyst support for conversion of
           biomass to 5-hydroxymethylfurfural
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Piyaporn Wataniyakul, Panatpong Boonnoun, Armando T. Quitain, Mitsuru Sasaki, Tetsuya Kida, Navadol Laosiripojana, Artiwan Shotipruk
      Suitable hydrothermal carbonization conditions including temperature (180–250°C) and time (6–24h) were determined for the preparation of glucose derived carbon material, used as a catalyst support for sugar and cellulose conversions. While hydrothermal carbons (HTCs) prepared at various conditions exhibited similar chemical and structural characteristics, examination of liquid fractions from hydrothermal carbonization provided additional evidence on the stability of the HTCs. The suitable hydrothermal carbonization condition was found to be 220°C and 6h, providing a stable carbon support that after sulfonation, yielded carbon-based acid catalyst (HTC220-6-SO3H) that exhibit relatively high catalytic activities for cellulose hydrolysis and fructose dehydration reaction, giving glucose and HMF yields of 43.63±1.62wt.% and 20.29±1.09wt.%, respectively.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Preparation of a novel 1D Co(II) coordination polymer
           Co(dpa)(2,2′-bipy)(H2O)2 catalyst for the allylic oxidation of
           cyclohexene
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Xuemin Feng, Jianmin Hao, Yuanyuan Gao, Weiwei Bai, Yangyang Cheng, Feng Wang, Limin Han, Quanling Suo, Yaqi Wang
      A Co(II) coordination polymer, Co(dpa)(2,2′-bipy)(H2O)2 (H2dpa=2,2′-diphenic acid, 2,2′-bipy=2,2′-bipyridine), was prepared by a hydrothermal method and characterized in detail. The dpa2− ligand offered two carboxylate groups to construct two monodentate configurations that connected two Co(II) centers to form a 1D chain. Multiple 1D chains stacked on each other to generate a 3D framework via the weak CH⋯ π interaction. Co(dpa)(2,2′-bipy)(H2O)2 exhibited an efficient catalytic performance for solvent-free allylic oxidation of cyclohexene by oxygen. The highest turn-over frequency (TOF) of 979h−1 was obtained at the molar ratio of Co(dpa)(2,2′-bipy)(H2O)2 to cyclohexene of 1:16000.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Carbon dioxide reforming of methane over nanostructured Ni/Al2O3 catalysts
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Jinwei Sun, Sun Wang, Yu Guo, Mengzhu Li, Haikui Zou, Zhou-jun Wang
      Ni catalysts supported on nanosheet (S) and nanoplate (P) γ-Al2O3 have been successfully synthesized for carbon dioxide (CO2) reforming of methane. The Ni/Al2O3-S catalyst possessed excellent activity and stability whereas the Ni/Al2O3-P catalyst exhibited slightly lower activity and much worse stability. The Ni/Al2O3-S catalyst displayed much smaller size of Ni nanoparticles, which may explain the difference in activity. The Ni/Al2O3-S catalyst possessed enhanced anti-sintering and anti-coke properties, which would lead to an improved stability.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • A novel method for the synthesis of highly stable nickel-modified sulfated
           zirconia catalysts for n-pentane isomerization
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Shengnan Li, Hua Song, Yunfeng Hu, Feng Li, Yanguang Chen
      A highly stable Ni modified sulfated zirconia catalyst was prepared by two different methods and used for n-pentane isomerization. The results showed that compared with the catalyst prepared by the sol-gel method, the catalyst prepared by the hydrothermal method showed higher surface area, larger pore size, smaller crystallite size of tetragonal ZrO2, more stable S-containing adsorbed species and a high isopentane yield. In particular, the Ni−/S2O8 2−-ZrO2–Al2O3, which was prepared by the hydrothermal method (Ni/SZA-R), provided a sustainable high isopentane yield (ca. 68%) with a slight deactivation (15%) only within 50h of continuous reaction. This result was ascribed to the catalyst's larger mean pore size and the increased concentration of more stable S-containing species formed compared to the catalyst prepared by the sol-gel method. The stability behavior of this Ni/SZA-R catalyst in terms of isopentane yield vs time appears by far larger (increase by a factor of ~ 2–15) compared to other non noble metal modified sulfated zirconia-based catalysts reported in the open literature.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Ru(II)-functionalized SBA-15 as highly chemoselective, acid free and
           sustainable heterogeneous catalyst for acetalization of aldehydes and
           ketones
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Anish Lazar, K.J. Betsy, C.P. Vinod, A.P. Singh
      Combining electron deficient Ru(II) coordination sites with organofunctionalized SBA-15, (L)Ru(II)@SBA-15, result in a mild, neutral, water scavenger free and chemo-selective acetalization catalyst for cyclic/acyclic acetals. Vacant coordination sites of ruthenium in (L)Ru(II)@SBA-15 activates protecting groups as well as reactants simultaneously and restricts the reverse acetalization reaction. Synthesized (L)Ru(II)@SBA-15 catalyst has been thoroughly characterized and act as competitive catalyst compared to conventional acid catalysts. (L)Ru(II)@SBA-15 performs high catalytic activity as well as selectivity within 20min with high TOF. The catalyst can be recycled and reaction parameters are optimized.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Microwave assisted benzyl alcohol oxidation using iron particles on
           furfuryl alcohol derived supports
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Floriane Mangin, Pepijn Prinsen, Alfonso Yepez, Muhammad Rehan Hasan Shah Gilani, Guobao Xu, Christophe Len, Rafael Luque
      This work compares the catalytic activity of iron catalysts supported on porous furfuryl alcohol derived resins for the selective conversion of benzyl alcohol to benzaldehyde using hydrogen peroxide as the oxidant and assisted by microwave irradiation. The catalysts were prepared mechanochemically by ball-milling in the dry state. Initial results showed that the pressure in the reaction medium and the oxidant load are essential to achieve significant conversions. An apparent minimum catalyst load of 0.05mol% Fe was required for significant reactivity at 132°C.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • A polymer supported Cu(II) catalyst for oxidative amidation of benzyl
           alcohol and substituted amines in TBHP/H2O
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): M.K. Renuka, V. Gayathri
      A new polymer supported copper complex of 2,6-bis(benzimidazolyl)pyridine Cu(PS-BBP)Cl2 was prepared and characterized by elemental analyses, AAS, ESR, IR and UV–Vis spectral studies, magnetic moment measurement and thermogravimetric analyses. A facile oxidative coupling of alcohols and amines to synthesize amides was developed using Cu(PS-BBP)Cl2 as a catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant using water as a solvent in a one-pot process. The optimum conditions were determined for the reaction of benzyl alcohol and benzylamine by varying solvents, temperature, substrate to TBHP ratio and catalyst concentration and the yield resulted was found to be 95%. The catalyst showed excellent catalytic activity and reusability. A tentative reaction mechanism has been proposed.

      PubDate: 2017-11-09T02:09:29Z
       
  • Base free palladium-Ag2O catalyzed decarboxylative cross-coupling of
           alkynyl carboxylic acids with triarylbismuth reagents
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Kishor Eknath Balsane, Sitaram Haribhau Gund, Jayashree Milind Nagarkar
      We have developed a novel base free methodology for the decarboxylative cross-coupling reaction of alkynyl carboxylic acids with triarylbismuth reagents. The decarboxylative cross-coupling reaction proceeds using the homogeneous Pd(OAc)2-Ag2O catalytic system at room temperature with short reaction time. Triarylbismuth reagents are particularly attractive due to their air and moisture stability, high functional group tolerance and threefold arylating property. This methodology is particularly useful for the synthesis of unsymmetrical substituted alkynes.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Di-methyl carbonate transesterification with EtOH over MOFs: Basicity and
           synergic effect of basic and acid active sites
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Luca Desidery, Somboon Chaemcheun, Mekhman Yusubov, Francis Verpoort
      The catalytic activity of metal-organic frameworks (MOFs) towards the transesterification of dimethyl carbonate with ethanol has been unprecedented assessed. The relation between the catalytic activity and the amount of base active sites has been proved as well as the inability of the Lewis acid sites alone to catalyze this transesterification. The synergic effect of both acid and base sites cannot be completely excluded and a plausible reaction mechanism has been proposed. MOF-808 resulted to be more efficient than every heterogeneous commercial catalyst. MOF-808 can be recycled up to 4 times with exceptional retention of both catalytic activity and crystal structure.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • N-heterocyclic monodentate ligands as stabilizing agents for catalytically
           active Pd-nanoparticles
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Agnieszka Krogul-Sobczak, Patrycja Kasperska, Grzegorz Litwinienko
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Hydrogenation of paranitrotoluene to p-methyl-cyclohexylamine catalyzed by
           PEG modified Ru/NaY catalysts
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Hongwei Li, Zeyu Li, Dong Ji, Guixian Li
      A series of Ru/NaY catalysts modified by a different amount of polyethylene glycol (PEG) were prepared using the impregnation-precipitation method and tested towards the reaction of paranitrotoluene (PNT) hydrogenation to p-methyl-cyclohexylamine (PMC). The various characterization techniques applied suggested that a suitable amount of PEG was responsible to reduce Ru nanoparticles size and enhance at the same time metallic Ru loading on the catalyst surface. A Ru-PEG7.5/NaY catalyst modified by 7.5mL PEG showed a higher PNT conversion (>99.9%) and reaction selectivity to PMC (95.2%) at 160°C for 35min compared to other Ru catalysts of different Ru/PEG molar ratio. The reusability of the Ru-PEG7.5/NaY catalyst was also investigated showing only slight deactivation due to Ru agglomeration.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Microwave-assisted rapid synthesis of Ag-β-cyclodextrin/TiO2/AC with
           exposed {001} facets for highly efficient naphthalene degradation under
           visible light
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Xiaoqing Chen, Dandan Liu, Zhansheng Wu, Giancarlo Cravotto, Zhilin Wu, Bang-Ce Ye
      This study describes the microwave-assisted one-step synthesis of Ag and β-cyclodextrin (β-CD) co-doped titanium dioxide nanoparticles loaded onto activated carbon (TiO2/AC) with dominating {001} facets, using NaF as a morphology controlling agent, for photocatalytic degradation of naphthalene. F doping inhibited the anatase-to-rutile phase transformation. A red shift in the absorption edge in the UV–visible spectra was observed when β-CD and Ag co-doped TiO2. F-Ag-β-CD/TiO2/AC with exposed {001} facets exhibited the highest photocatalytic activity (98.4%) and rate constant under visible-light irradiation. The photocatalyst also displayed excellent photocatalytic stability. Hydroxyl radicals (OH) play an important role in naphthalene photodegradation.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • A lignin-derived sulphated carbon for acid catalyzed transformations of
           bio-derived sugars
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Churchil A. Antonyraj, Ajit Haridas
      Bio-ethanol plant derived crude lignin was utilized in the synthesis of carbon catalysts for the conversion of xylose in acid pretreatment liquid (APL, another by-product of bio-ethanol plant) into furfural. Also, xylose dehydration to furfural by carbon catalysts carried out in water-MIBK biphasic system showed a maximum yield of 60% furfural. In addition, a carbon catalyst modified with 1N H2SO4 was found to be highly active as concentrated acids reported earlier in the open literature. Only a small part of the total crude lignin from the bio-ethanol plant was utilized in this manner. Further research is necessary on the valorization of remaining crude lignin waste.

      PubDate: 2017-11-09T02:09:29Z
       
  • Direct synthesis of quinazolinones by heterogeneous Cu(OH)X/OMS-2 catalyst
           under oxygen
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Yuanguang Wang, Xu Meng, Gexin Chen, Peiqing Zhao
      Copper hydroxide supported on manganese oxide octahedral molecular sieves (Cu(OH)X/OMS-2) was prepared and was found to be highly active for the oxidative cyclization of benzyl alcohols or methylarenes solely with anthranilamides using oxygen as oxidant. The low loading copper hydroxide was used as a catalytic metal. The hydroxyl of catalyst with spherical agglomeration led to higher performance of catalytic activity for the synthesis of quinazolinones. Moreover, Cu(OH)X/OMS-2 could be reused 5 times without any significant loss of activity.

      PubDate: 2017-11-09T02:09:29Z
       
  • Highly efficient asymmetric aerobic oxidative coupling of 2-naphthols in
           the presence of bioinspired iron aminopyridine complexes
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Nikolay V. Tkachenko, Oleg Y. Lyakin, Denis G. Samsonenko, Evgenii P. Talsi, Konstantin P. Bryliakov
      For the first time, it has been shown that chiral bipyrrolidine derived bioinspired non-heme iron complexes of the types [LFeX2], [LFe(μ-O)2FeL][X]4, and [LFe(μ-O)(μ-OAc)FeL][X]2 (where L – aminopyridine ligand, X− =OTf−, SbF6 −, ClO4 −) are capable of efficiently conducting aerobic oxidative coupling of 2-naphthols in an asymmetric fashion, with formation of the corresponding enantiomerically enriched BINOLs (up to 56% ee) in good yields (up to 94% within 24h), using as little as 1mol% of the catalyst. The effect of ligand substitutents, solvent, counteranion, 2-naphthol structure, and oxygen pressure on the catalytic performance has been systematically examined.
      Graphical abstract image

      PubDate: 2017-11-09T02:09:29Z
       
  • Electrochemical promotion of propylene combustion on Ag catalytic coatings
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): I. Kalaitzidou, T. Cavoué, A. Boreave, L. Burel, F. Gaillard, L. Retailleau-Mevel, E.A. Baranova, M. Rieu, J.P. Viricelle, D. Horwat, P. Vernoux
      Catalytic and electrocatalytic tests have been carried out in a solid oxide cell for propylene combustion using two different Ag screen-printed films deposited on yttria-stabilized zirconia. Competitive adsorption between oxygen and propylene has been observed at 300°C. Catalytic performances can be tailored by current application in a non-Faradaic manner. The predominant impact of current applications is to modify the reactivity of oxygen present on the Ag surface. Positive current applications enhance the propylene conversion by producing more reactive oxygen species. This beneficial effect is more pronounced under lean-burn conditions where the oxygen coverage on Ag is high.
      Graphical abstract image

      PubDate: 2017-10-26T05:31:30Z
       
  • Ethanol dehydration to diethyl ether over Cu-Fe/ZSM-5 catalysts
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Taís Klein Rodrigues de Oliveira, Morgana Rosset, Oscar W. Perez-Lopez
      Dehydration of ethanol to diethyl ether (DEE) was studied over Cu-Fe/ZSM-5 catalysts over the temperature range of 160−220°C. Metal loaded samples were prepared by wet impregnation and characterized using specific surface area measurements, X-ray diffraction and temperature-programmed desorption of NH3. The presence of Fe on ZSM-5 did not change the acidity of ZSM-5 but did decrease its crystallinity. On the other hand, the presence of Cu changed the acidity of ZSM-5 and favored DEE formation. The important result of the present work is the establishment of a correlation between the moderate strength of acid sites of Cu/ZSM-5 and the formation of DEE. Low-temperatures and medium strength of acid sites favor DEE production.
      Graphical abstract image

      PubDate: 2017-10-26T05:31:30Z
       
  • Degradation of microcrystalline cellulose to 5-hydroxylmethylfurfural
           catalyzed by CrCl3/[R4N]ReO4
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Xue Bai, Jing-Yun Wang, Nan Men, Shu-Liang Zang
      CrCl3 and tetraalkyl ammonium perrhenate were used as catalysts to promote the microcrystalline cellulose degradation to 5-hydroxylmethylfurfural (5-HMF) in ionic liquids. CrCl3/[R4N]ReO4 shows good catalytic activity towards cellulose degradation, where 49.3% of 5-HMF yield was obtained under the condition of 5mol% of tetramethyl ammonium perrhenate and 7mol% of CrCl3 by using 1-ethyl-3-methylimidazolium chloride ([Emim]Cl) as solvent. The influence of water amount, reaction time and temperature, type and amount of catalysts on cellulose degradation were fully examined.

      PubDate: 2017-10-26T05:31:30Z
       
  • Editorial Board/Aims & Scope
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103


      PubDate: 2017-10-26T05:31:30Z
       
  • Influence of V-sources on the catalytic performance of VMCM-41 in the
           selective oxidation of methane to formaldehyde
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Thi Thuy Hanh Dang, Dominik Seeburg, Joerg Radnik, Carsten Kreyenschulte, Hanan Atia, Thi Thu Ha Vu, Sebastian Wohlrab
      VMCM-41 catalysts from two different tetravalent vanadium sources, hydrothermally synthesized after a mild gelation step at room temperature, were used as catalysts for the selective oxidation of methane to formaldehyde. Vanadyl acetylacetonate as VMCM-41 precursor, facilitates highest VOx density with predominance of monomeric and a small portion of low-oligomeric VOx species. It produces CH2O in high yield and the highest space time yield (STYCH2O) reaches 5.3kgCH2O·kgcat −1·h−1 at 600°C (rate of formation, rCH2O of 363h−1). VMCM-41 synthesized from vanadyl sulfate hydrate precursor contains a more significant portion of low-oligomeric species. With a lower V loading, these VOx species are significantly less active resulting in a maximum STYCH2O of 2.7kgCH2O·kgcat −1·h−1 at 625°C (rCH2O of 243h−1).

      PubDate: 2017-10-26T05:31:30Z
       
  • [MoO3(2,2′–bipy)]n catalyzed oxidation of amines and sulfides
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Irene Tosi, Carolina Vurchio, Marta Abrantes, Isabel S. Gonçalves, Martyn Pillinger, Fabrizio Cavani, Franca M. Cordero, Alberto Brandi
      The polymeric catalyst [MoO3(2,2′–bipy)]n has been employed in the oxidation of secondary amines to nitrones, and sulfides to sulfoxides or sulfones, using tert–butylhydroperoxide (TBHP) as the stoichiometric oxidant. Whereas the oxidation of amines occurs with less proficiency with respect to other previously studied polymeric Mo catalysts, the oxidation of sulfides occurs in high yield and selectivity. The catalyst is flexible in terms of substrate scope (aromatic, aliphatic and cyclic sulfides, thioheterocycles such as dimethyldibenzothiophene, the oxidation of which forms the basis of oxidation/separation processes for the desulfurization of fuels) and the ability to switch sulfoxide/sulfone product selectivities by adjusting the reaction conditions.
      Graphical abstract image

      PubDate: 2017-10-26T05:31:30Z
       
  • Y(OTf)3-catalyzed addition reaction of alcohol to β-nitrostyrene
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Chunmei Li, Weidong Zhan, Furen Zhang
      A concise and efficient addition reaction of alcohol to β-nitrostyrene promoted by Y(OTf)3 has been established for the synthesis of β-nitroether derivatives. The present approach shows attractive properties, such as the high efficiency of catalyst, operational simplicity, and the tolerance of a wide range of functional groups. This strategy not only provides a variety of β-nitroethers but also expands the scope of application of early transition metals.
      Graphical abstract image

      PubDate: 2017-10-26T05:31:30Z
       
  • Efficient heterogeneous polyoxometalate-hybrid catalysts for the oxidative
           desulfurization of fuels
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Fátima Mirante, Luís Dias, Mariana Silva, Susana O. Ribeiro, Marta C. Corvo, Baltazar de Castro, Carlos M. Granadeiro, Salete S. Balula
      The heterogenization of the highly active monovacant polyoxotungstate ([PW11O39]7−, abbreviated as PW11) was achieved by preparing the corresponding long chain quaternary ammonium salt (ODA7PW11, ODA=CH3(CH2)17(CH3)3N). The complete cation exchange confers total heterogeneity to the monovacant catalyst while keeping its oxidative catalytic activity. In fact, the heterogeneous catalyst allowed for the complete desulfurization of a multicomponent model diesel (2000ppm S) after 40min of reaction, conciliating extraction (using BMIMPF6 solvent) and oxidation (ECODS process using H2O2 oxidant). The heterogeneous catalyst has shown a superior desulfurization performance when compared with the homogeneous quaternary ammonium TBAPW11 catalyst (TBA=(C4H9)4 N). Both hybrid catalysts have been successfully reused in consecutive ECODS cycles. Additionally, the long carbon chain cations provide a protective environment around the polyoxometalate allowing for ODA7PW11 to retain its heterogeneity and structure after the ECODS process.

      PubDate: 2017-10-18T00:30:22Z
       
  • CuCl2/[hmim]Br: A new recyclable catalytic system for aromatization of
           cyclic dienes
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Piyada Taboonpong, Warinthorn Chavasiri
      The combination of copper(II) chloride and 1-hexyl-3-methylimidazolium bromide ([hmim]Br) as a new recyclable catalytic system in the presence of TBHP for aromatization of cyclic dienes is disclosed. The system could furnish the corresponding aromatics in moderate to excellent yield. The competition between aromatization and oxidation of benzylic substrates were also studied. This developed catalytic system could be reused and recycled at least nine times without significant loss of the producitivity.
      Graphical abstract image

      PubDate: 2017-10-18T00:30:22Z
       
  • Fabrication of hollow-structured FeOx-MnOx oxidative catalysts with
           ultra-large surface area
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Baohuai Zhao, Zesheng Yang, Rui Ran, Zeliang Guo, Xiaodong Wu, Duan Weng
      In this work, hollow-structured MnO x and FeO x -MnO x were synthesized by self-template route and applied for CO oxidation. FeO x -MnO x exhibited better catalytic activity than MnO x . It could convert 79.1% CO at 20°C and had a higher CO conversion during the temperature ramping. The FeO x species could react with HCl and greatly helped to increase the specific surface area (428.5m2 g−1) and pore volume (0.82cm3 g−1) of the catalyst. The reserved FeO x in the FeO x -MnO x sample enhanced the redox properties and increased the amount of reactive oxygen species.
      Graphical abstract image

      PubDate: 2017-10-18T00:30:22Z
       
  • Highly active copper-based Ce@TiO2 core-shell catalysts for the selective
           reduction of nitric oxide with carbon monoxide in the presence of oxygen
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Naima López, Gonzalo Aguila, Paulo Araya, Sichem Guerrero
      A novel core-shell K/Cu/SmCe@TiO2 catalyst is here reported being highly active on the selective reduction of nitric oxide with carbon monoxide under oxidizing conditions. It was found that the reaction proceeds with the generation of nitrates and nitrites adsorbed on the support and ionic nitrates adsorbed on alkaline sites. Full conversion of CO was achieved from 255°C and 97% NO conversion was reached at 330°C.
      Graphical abstract image

      PubDate: 2017-10-18T00:30:22Z
       
  • Palladium nanocatalysts in glycerol: Tuning the reactivity by effect of
           the stabilizer
    • Abstract: Publication date: 10 January 2018
      Source:Catalysis Communications, Volume 104
      Author(s): Antonio Reina, Alejandro Serrano-Maldonado, Emmanuelle Teuma, Erika Martin, Montserrat Gómez
      Palladium nanoparticles (PdNPs) prepared in neat glycerol containing TPPTS (tris(3-sulfophenyl)phosphine trisodium salt) or cinchona-based alkaloids (cinchonidine, quinidine) as capping agents, were applied as catalysts in fluoride-free Hiyama couplings and conjugate additions with the aim of evaluating the influence of the stabilizer in the catalytic reactivity. Therefore, PdNPs stabilized by phosphine favored CC cross-couplings, whereas those containing alkaloids showed enhanced suitability for CC homo-couplings and conjugate additions. The metal/stabilizer coordination mode, i.e. PdP dative bond and π-π interaction between quinoline moiety and palladium surface, is certainly key for the stabilization of different active metallic species and then promoting distinctive catalytic pathways.
      Graphical abstract image

      PubDate: 2017-10-18T00:30:22Z
       
  • Nickel embedded on triazole-modified magnetic nanoparticles: A novel and
           sustainable heterogeneous catalyst for Hiyama reaction in fluoride-free
           condition
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Abdol R. Hajipour, Parisa Abolfathi
      An interesting MNPs -supported nano-nickel catalyst was successfully synthesized through “click” reaction of azide-functionalized magnetic nanoparticles with 2-ethynylpyridine followed by immobilization of nickel nanoparticles. In deed, the azide group was introduced into the magnetic nanoparticles surface via ring-opening of exist oxirane rings on the surface. The catalytic activity of this catalyst was then evaluated for Hiyama cross-coupling reaction under fluoride-free conditions. Besides, the as-prepared nanocatalyst can be reused easily by an external magnet for several times.

      PubDate: 2017-10-18T00:30:22Z
       
  • A novel CeO2-MoO3-WO3/TiO2 catalyst for selective catalytic reduction of
           NO with NH3
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Ye Jiang, Changzhong Bao, Qingyu Liu, Guitao Liang, Mingyuan Lu, Shiyuan Ma
      A novel CeO2-MoO3-WO3/TiO2 (CMWT) catalyst was prepared by a single step sol-gel (SG) method. It exhibited 93.8%–98.9% of NO conversion at 275–450°C and high tolerance to 10% H2O and 1000ppm SO2 at a gas hourly space velocity (GHSV) of 90,000h−1. Superior SCR activity of CMWT catalyst could be attributed to the presence of more Ce 3 + and chemisorbed oxygen, higher redox ability, stronger adsorption capacity of NH3 species and the strong interaction among ceria, molybdenum, tungsten and titania.

      PubDate: 2017-10-18T00:30:22Z
       
  • The catalytic performance of Mo-impregnated HZSM-5 zeolite in CH4
           
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Pinglian Tan
      The catalytic activity and stability of Mo/HZSM-5 solid with Mo loading higher than 10wt% in methane aromatization are significantly improved after pretreatment with a CH4/Ar/He (9:1:10, v/v) gas mixture. A 16wt% Mo loading is found to provide the best catalytic performance for the aromatization of methane and better than previously reported in the literature (similar reaction conditions) over Mo-impregnated HZSM-5zeolites. After 30h of continuous reaction at 700°C and using a space velocity of 1500mlg−1 h−1, the 16wt% Mo-based catalyst provides an aromatic yield of 7.8% and a CH4 conversion of 9.5%.
      Graphical abstract image

      PubDate: 2017-10-18T00:30:22Z
       
  • A novel composite Fe-N/O catalyst for the effective enhancement of
           oxidative capacity of persulfate at ambient temperature
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Jiejie Wang, Cui Wang, Shaoping Tong
      This study reports on the synthesis of a novel composite Fe-N/O catalyst for the enhancement of oxidative capacity of persulfate at ambient temperature. The fabricated composite was characterized by XRD, FTIR and TEM techniques. Results showed that the composite Fe-N/O catalyst consist of Fe3N and Fe3O4 crystal phases. The performance of Fe-N/O in the oxidation of Acid Red 73 (AR 73) by persulfate was investigated and it was found that the decolorization efficiency and total organic carbon removal (TOC) were 96% and 72.5% in 10min at 22°C, respectively. It was concluded that the interface between the Fe3N and Fe3O4 phases might account for the high efficiency observed.

      PubDate: 2017-10-18T00:30:22Z
       
  • Regulating the catalytic properties of Pt/Al2O3 through nanoscale inkjet
           printing
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Vasiliki K. Chatziiona, Barbara K. Constantinou, Petros G. Savva, Georgios G. Olympiou, Konstantinos Kapnisis, Andreas Anayiotos, Costas N. Costa
      For the first time ever, a 0.1wt% Pt/Al2O3 catalyst was prepared by novel inkjet printing and compared against two catalysts prepared by a standard and modified wet impregnation method. The printed catalyst was found to present excellent activity and wide operating temperature window on the selective catalytic reduction of NO by H2 under strongly oxidizing conditions (H2-SCR) in the very low-temperature range of 100–200°C. The transient studies performed in the present work indicated that the printing process followed led to a unique surface structure of the printed catalyst that probably favors the formation of different active intermediate NOx species, which are active at very low reaction temperatures. Moreover, it was found that the inkjet printing protocol followed resulted in a relatively uniform nano-spherical structure of the developed catalyst.

      PubDate: 2017-10-11T09:38:20Z
       
  • Catalytic performance of Ni/γ-Al2O3 for hydrogenation of
           2-ethyl-2-hexenal
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Lili Zhao, Yi Wang, Hualiang An, Xinqiang Zhao, Yanji Wang
      The effect of reaction conditions on the catalytic performance of Ni/γ-Al2O3 was investigated and the result showed that Ni/γ-Al2O3 showed excellent catalytic activity. However, the catalytic performance of the recovered Ni/γ-Al2O3 catalyst declined dramatically. The fresh and the recovered catalysts were comparatively analyzed by means of XRD, XPS and FT-IR techniques. The result demonstrated that the main reason for the activity decline of the recovered Ni/γ-Al2O3 catalyst is that the surface Ni has been reoxidized to NiO. After calcination and reduction, the recovered Ni/γ-Al2O3 catalyst could be reused four times without a significant decrease in its catalytic performance.

      PubDate: 2017-10-11T09:38:20Z
       
  • Microwave-assisted copper(I) catalyzed A3-coupling reaction: Reactivity,
           substrate scope and the structural characterization of two coupling
           products
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Vitthalrao S. Kashid, Maravanji S. Balakrishna
      The application of highly efficient catalyst [{Cu(μ −I)2Cu}(PPh3)4] for the synthesis of biologically and pharmaceutically important propargylamine derivatives through microwave assisted A3-coupling reaction is described. The A3-coupling reaction performed under microwave conditions with a catalyst loading of 0.1mol% produced propargylamines in almost quantitative isolated yields. Most of the reactions were completed within 5min. Various alkynes, amines and aldehydes were employed to produce propargylamines in excellent yields.
      Graphical abstract image

      PubDate: 2017-10-11T09:38:20Z
       
  • Mono-6-deoxy-6-aminopropylamino-β-cyclodextrin as a supramolecular
           catalyst for the synthesis of indolyl 1H-pyrrole via one-pot four
           component reaction in water
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Vijay Vilas Shinde, Daham Jeong, Sang Woo Joo, Eunae Cho, Seunho Jung
      We report here the synthesis of mono-6-deoxy-6-aminopropylamino-β-cyclodextrin (Pr-β-CD) as a supramolecular organic base catalyst. Pr-β-CD was characterized by FT-IR, NMR, MALDI-TOF mass spectrometry and SEM analysis. Using this Pr-β-CD, biologically important indolyl 1H-pyrrole derivatives were synthesized with good to excellent yields in an aqueous medium via one-pot four-component reaction. Furthermore, the catalytic mechanism was elucidated in detail by using 2D NMR (ROESY), FE-SEM and FT-IR studies. The credit of the presented protocol includes the use of novel efficacious, reusable eco-friendly supramolecular carbohydrate catalyst, and precludes the use of organic solvents and column chromatography.
      Graphical abstract image

      PubDate: 2017-10-11T09:38:20Z
       
  • Tuning the selectivity of phenol hydrogenation on Pd/C with acid and basic
           media
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Mingming Li, Yi Li, Lu Jia, Yong Wang
      The selectivity of phenol hydrogenation over Pd/C was successfully tuned by various Bronsted acid and base additives. Compared with neutral reaction condition, the basic condition witnessed decreased catalytic activity and cyclohexanone selectivity while the opposite trend was observed under acidic condition. Mechanistic studies indicated the varied interaction of substrate with acid and base is responsible for the activity difference, while the changed keto-enol tautomerization correlates directly to the selectivity variation.

      PubDate: 2017-10-11T09:38:20Z
       
  • ZnO2-promoted ZnO as an efficient photocatalyst for the photoreduction of
           carbon dioxide in the presence of water
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Qiangsheng Guo, Qinghong Zhang, Hongzhi Wang, Zhe Zhao
      ZnO2-promoted ZnO photocatalysts were synthesized via H2O2 treatment, and their structural properties, optical properties, and activity for CO2 photoreduction were systematically studied. It was revealed that an excess of ZnO2 increased the surface area and enhanced oxygen vacancies, which significantly increased the adsorption capacity of molecular CO2. As a result, ZnO2-promoted ZnO showed a 21 times enhancement of CO2 photoreduction, with the total yield of 1.0Zn-60 increased from 3.5μmolL−1 to 73.5μmolL−1 of pristine ZnO. Based on the results of in situ CO2-IR and product distribution, a reaction mechanism for CO2 photoreduction on ZnO catalyst was proposed.
      Graphical abstract image

      PubDate: 2017-10-04T08:31:21Z
       
  • The roles of surface oxygen vacancy over Mg4Ta2O9-x photocatalyst in
           enhancing visible-light photocatalytic hydrogen evolution performance
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Entian Cui, Qiangqiang Meng, Chengyan Ge, Guiyun Yu, Guihua Hou, Ning Xu, Feng Zhang, Yuqi Wu
      Extending the light absorption range of wide-band-gap semiconductor oxides is crucial to the effective solar-hydrogen energy conversion. Here, we introduced surface oxygen vacancies into Mg4Ta2O9 and constructed a narrow band-gap Mg4Ta2O9-x photocatalyst by a simple low temperature reduction method. The as-synthesized Mg4Ta2O9-x exhibits a significantly extended absorption edge in visible light range, which originates from the intermediate defect level band and electronic states created by introducing surface oxygen vacancy. With the same Pt loaded content (0.5wt%), the Pt-loaded Mg4Ta2O9-x exhibits the excellent photocatalytic stability and higher hydrogen evolution activity (4.42μmol·h−1) than the Pt-loaded Mg4Ta2O9 (0.14μmol·h−1) under visible light irradiation.
      Graphical abstract image

      PubDate: 2017-10-04T08:31:21Z
       
  • Hydrosols of Pd and Pd-H2: Influence of particle nature on the rate of
           catalytic reduction of hexacyanoferrate(III) ions with hydrogen
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Boris G. Ershov, Roman D. Solovov
      Palladium nanoparticles (5.3±1.4nm) catalyze the reduction of hexacyanoferrate(III) ions with hydrogen in aqueous solution. The reaction rate substantially (approximately 6-fold) increases if the nanoparticles are pre-saturated with hydrogen. The difference between the electronic properties of hydrogenated and non-hydrogenated palladium particles determines their activity in dissociation of the hydrogen molecule into atoms.
      Graphical abstract image

      PubDate: 2017-10-04T08:31:21Z
       
  • Catalytic aromatization of methyl bromide to aromatics over bimetallic
           CuO-ZnO/HZSM-5
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Hao Chen, Tan Chen, Kequan Chen, Jie Fu, Xiuyang Lu, Pingkai Ouyang
      The catalytic conversions of CH3Br into aromatics over HZSM-5, CuO/HZSM-5, ZnO/HZSM-5 and CuO-ZnO/HZSM-5 were investigated to study the synergistic effect of CuO and ZnO. The results showed that the yield of aromatics decreased in the order of 2%CuO-3%ZnO/HZSM-5 (27.4%)>5%CuO/HZSM-5 (19.3%)>HZSM-5 (14.4%)>5%ZnO/HZSM-5 (6.0%) at 360°C under the same condition, and the bimetallic 2%CuO-3%ZnO/HZSM-5 gave 33.0% aromatic yield at 380°C. The addition of ZnO promoted the catalytic activity of CuO in CH3Br aromatization to aromatics. The higher strong acidity significantly improved the hydrogen-transfer and aromatization reaction, increasing the yield of aromatics.
      Graphical abstract image

      PubDate: 2017-10-04T08:31:21Z
       
  • Fe(NO3)3/2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ): An efficient
           catalyst system for selective oxidation of alcohols under aerobic
           conditions
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Yongke Hu, Lei Chen, Bindong Li
      A practical and efficient catalyst system for the oxidation of alcohols to carbonyl compounds using catalytic amounts of DDQ and Fe(NO3)3 with air as the environmentally benign oxidant has been developed. A variety of benzylic, heterocyclic, allylic and propargylic alcohols were smoothly converted into aldehydes or ketones in good to excellent yields. In case of large-scale reaction for the oxidation of benzyl alcohol, benzaldehyde was obtained in 93% isolated yield. Moreover, a possible reaction mechanism was proposed.

      PubDate: 2017-10-04T08:31:21Z
       
  • Chemoselective hydrogenation of nitroarenes catalyzed by
           cellulose-supported Pd NPs
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Dan-dan Li, Jia-wei Zhang, Chun Cai
      Cellulose-supported palladium nanoparticles (NPs) were prepared by straightforward deposition of metal NPs on modified cellulose. The catalyst exhibited excellent catalytic activity and selectivity in room-temperature hydrogenation of various nitroarenes to arylamines under atmospheric hydrogen pressure in neat water without any additives. High chemoselectivity was also achieved in the hydrogenation of substituted nitroarenes with multiple reducible groups. The catalyst can be recycled by simple centrifugation and reused for at least 4 times without significant decline of yields.

      PubDate: 2017-10-04T08:31:21Z
       
  • Mn-MIL-100 heterogeneous catalyst for the selective oxidative cleavage of
           alkenes to aldehydes
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Ying Ha, Manman Mu, Qingling Liu, Na Ji, Chunfeng Song, Degang Ma
      Four MIL metal organic framework materials with large surface area and high stability were utilized as heterogeneous catalysts in the selective oxidation of styrene with tert-butylhydroperoxide (70% aqueous) as an oxidant in acetonitrile. Mn-MIL-100 exhibits excellent styrene conversion (89%) and benzaldehyde selectivity (85%) under optimized conditions. Furthermore, Mn-MIL-100 displays superior catalytic activity in the selective oxidation of aryl-olefins and is reused at least three times without significant deactivation. It appears that this specific material would open up a new pathway for MOFs towards the selective catalytic oxidation of aryl-olefins to the corresponding aldehydes.
      Graphical abstract image

      PubDate: 2017-10-04T08:31:21Z
       
  • Fabrication of nano-sized SAPO-11 crystals with enhanced dehydration of
           methanol to dimethyl ether
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Zhou Chen, Xinyuan Li, Yingrui Xu, Yunyun Dong, Weikun Lai, Weiping Fang, Xiaodong Yi
      Nano-sized SAPO-11 zeolite was successfully fabricated by a seed-induced quasi-solvothermal conversion (SIQSC) protocol without a secondary porogen that combined an in situ inoculating seed method (SI) and a quasi-solvothermal assisted conversion (QSC) process. The aggregation of SAPO-11 nanocrystals (20–30nm) to give larger particles with an approximate 200nm average size creates a lower acidity, larger surface area and higher inter-crystal mesoporosity than those in micro-sized SAPO-11 crystals. Importantly, the nano-sized SAPO-11 shows better performance in the dehydration of methanol to dimethyl ether (DME) than Al2O3 and micro-sized SAPO-11.
      Graphical abstract image

      PubDate: 2017-09-26T08:15:15Z
       
  • A practical and reusable catalyst for the synthesis of donor-acceptor
           cyclopropane
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Yanqun Zhang, Manyu Jin, Cunqi Wu, Yongxia Zhao, Hua Zhou, Jingwei Xu
      Herein, a convenient, recyclable and inexpensive Cu-based catalytic system is developed for the synthesis of donor-acceptor (D-A) cyclopropane via the cycloaddition of styrene derivatives with diethyl bromomalonate. A core-shell catalyst of Fe3O4@Cu2O is used to promote the construction of D-A cyclopropane with different functional groups in good yields. In our experiments, many harsh conditions, such as strict anhydrous and anaerobic, are avoided. The Fe3O4@Cu2O particles are easily made, air-stable and of low cost. What's more, the magnetic property makes the catalyst easy to be separated and catalytical activity has no significant change even after being recycled for five times.
      Graphical abstract image

      PubDate: 2017-09-26T08:15:15Z
       
  • Highly active rod-like Co3O4 catalyst for the formaldehyde oxidation
           reaction
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Zeyun Fan, Wenjian Fang, Zhixiang Zhang, Mingxia Chen, Wenfeng Shangguan
      In this study, rod-like Co3O4 (Co3O4-rod) nanocatalyst was prepared by a modified precipitation method, which showed an excellent performance for formaldehyde oxidation to carbon dioxide and water. The light-off temperature (10% conversion) and the temperature for complete conversion of formaldehyde was at 60°C and 120°C, respectively. XPS and CO2-TPD analyses indicated that Co3O4-rod had abundant Co3+ and OH (hydroxyl) species on the surface compared with other morphologies of Co3O4 investigated (e.g. Co3O4-sheet and Co3O4-cube). It was proposed that Co3+ ions should be considered as active sites of good oxidation ability for formaldehyde catalytic oxidation.
      Graphical abstract image

      PubDate: 2017-09-26T08:15:15Z
       
  • A heterogeneous photocatalytic system based on a nickel complex over a CdS
           nanorod photosensitizer for H2 generation from water under visible light
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Qiu-Xia Peng, Dan Xue, Shu-Zhong Zhan, Xiao-Fang Jiang
      In this paper, we present a nickel complex, [BzPyN(CH3)2]2[Ni(mnt)2] 1 (mnt2− =maleonitriledithiolate), a cocatalyst for building a photocatalytic system for H2 generation from water. Under photoirradiation with blue light (λmax =469nm), 1, together with CdS nanorods (CdS NRs) as a photosensitizer, and ascorbic acid (H2A) as a sacrificial electron donor in a pH2.5 aqueous solution, produces hydrogen with a turnover number (TON) of 70,970mol of H2 per mol of catalyst during 70h irradiation and the average value of AQY is ~18% during 10h of irradiation.
      Graphical abstract image

      PubDate: 2017-09-26T08:15:15Z
       
  • The formation of (NH4)2V6O16 phase in the synthesized InVO4 for the
           hydrogen evolving applications
    • Abstract: Publication date: 5 January 2018
      Source:Catalysis Communications, Volume 103
      Author(s): Yu-Sheng Lai, Chih-Hsiang Yang, Jih-Mirn Jehng
      By controlling the synthesized conditions such as the compositions, pH and hydrothermal temperature of the In (or NH4)-V-O compounds, the structural information have been determined with the potential application in the hydrogen evolving efficiency. When the addition of ammonium ions to adjust the pH with the hydrothermal time of 4h, there is a maximum hydrogen production of 140.8μmol/g·cat. The maximum hydrogen production reaches at pH of 5. In addition, the (NH4)2V6O16 phase in the synthesized InVO4 has been observed. This crystalline ammonia vanadium-based material is capable to perform the photocatalysis process in hydrogen evolving.

      PubDate: 2017-09-26T08:15:15Z
       
 
 
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