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  Subjects -> ENGINEERING (Total: 2284 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (184 journals)
    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1208 journals)
    - ENGINEERING MECHANICS AND MATERIALS (389 journals)
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    - MECHANICAL ENGINEERING (89 journals)

ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 6)
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: 229)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
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Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
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Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
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Advances in Remote Sensing     Open Access   (Followers: 37)
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: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
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: 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: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
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Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
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Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
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: 4)
Batteries     Open Access   (Followers: 4)
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)
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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: 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: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
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  
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     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
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: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 3)
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: 254)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 181)
Composites Part B : Engineering     Hybrid Journal   (Followers: 227)
Composites Science and Technology     Hybrid Journal   (Followers: 184)
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Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     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  [3042 journals]
  • Biocatalytic aminolysis of ethyl (S)-mandelate by lipase from Candida
           antarctica
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Rafaely N. Lima, André L.M. Porto
      Enzymes play many roles in the advancement of biotechnology, discovery of new therapeutic agents and industrial processes. In this perspective, aminolysis reactions using lipase from Candida antarctica (CAL-B) were performed from ethyl (S)-mandelate and several aliphatic amines (45°C, hexane, 3–6h). By means of optimized conditions, amides with excellent isolated yields (60–97%) were synthetized. The biotechnological potential of CAL-B as a promising approach for the synthesis of organic compounds in a more sustainable, rapid, efficient and green chemistry perspective was verified on these results.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • First application of homogeneous Pd nanoparticles prepared by pulsed laser
           ablation in liquid to a Suzuki-type reaction
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Angela De Bonis, Rosarita D'Orsi, Maria Funicello, Paolo Lupattelli, Antonio Santagata, Roberto Teghil, Lucia Chiummiento
      Palladium nanoparticles are a valuable alternative to molecular catalysts for not requiring costly and toxic ligands. In this study palladium nanoparticles were produced by either pulsed laser ablation in liquid or direct reactions between ascorbic acid and a palladium salt. The obtained nanoparticles have been characterized by TEM, XRD and XPS techniques and they have been applied to the catalysis of the ligand-free Suzuki-type cross-coupling reaction. Methyl (E)-4-bromocrotonate has been coupled to different aryl and heteroarylboronic acids with yield up to 81% and selectivity between 85 and 90%. Investigations on catalytic reusability of the NPs have shown that they could be used for three or ten catalytic cycles without loss of activity, respectively for LAL or chemically synthesized Pd NPs.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • New insights into the promotional effects of Cu and Fe over V2O5-WO3/TiO2
           NH3-SCR catalysts towards oxidation of Hg0
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Hongyan Wang, Baodong Wang, Qi Sun, Yonglong Li, Wayne Qiang Xu, Junhua Li
      The promotional effects of Cu and Fe over the V2O5-WO3/TiO2 NH3-SCR catalyst for the oxidation of Hg0 and the selective catalytic reduction of NO by NH3 were investigated in the temperature range of 280–360°C. Cu or Fe addition, especially Cu, improved the catalytic performance of V2O5-WO3/TiO2. The results show that Cu2+ was the main Cu species in the Cu-containing catalyst, whereas FeVO4 was formed in the Fe-containing catalyst. Well-dispersed active species, good redox properties and abundant chemisorbed surface oxygen species on the catalyst surface were responsible for the high catalytic performances. Hg0 oxidation over the V-based catalysts may follow a Mars-Maessen mechanism.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Microwave-assisted synthesis of ZnIn2S4/g-C3N4 heterojunction
           photocatalysts for efficient visible light photocatalytic hydrogen
           evolution
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Ning Ding, Longshuai Zhang, Huiyin Zhang, Jiangjian Shi, Huijue Wu, Yanhong Luo, Dongmei Li, Qingbo Meng
      A series of ZnIn2S4/g-C3N4 composite photocatalysts for photosplitting water into H2 have been prepared by a microwave-assisted method for the first time. The pH medium in the preparation of the photocatalysts is found to have a strong influence on the photocatalytic activity of ZnIn2S4/g-C3N4, and 387μmol/h of H2 evolution rate is achieved for ZnIn2S4/20wt% g-C3N4 obtained in the neutral medium. Furthermore, the 〈100〉 crystal facet is revealed to be essential for the ZnIn2S4/g-C3N4 heterojunction formation. A preliminary mechanism is suggested that this heterojunction is beneficial for the interfacial photogenerated carrier separation and transfer, thus leading to better photocatalytic activity.

      PubDate: 2017-07-22T22:25:22Z
       
  • Photocatalytic hydrogen evolution from aqueous solutions on nanostructured
           Ag2S and Ag2S/Ag
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): S.I. Sadovnikov, E.A. Kozlova, E.Yu. Gerasimov, A.A. Rempel
      A new approach for synthesis of hybrid nanostructured silver sulfide - silver (Ag2S/Ag heteronanostructure) efficient photocatalyst based on chemical condensation with the using of Trilon BD has been suggested. Hybrid photocatalysts Ag2S/Ag are characterized by various techniques including XRD, HRTEM, EDX, DLS and BET. The hybrid photocatalyst Ag2S/Ag has shown higher activity in the hydrogen evolution from the aqueous solution of Na2S/Na2SO3 under the action of visible light (450nm) than nanostructured Ag2S photocatalyst. The improved activity of the catalysts is attributed to the presence of heterojunction between Ag2S and Ag nanoparticles that results in more efficient charge separation as compared with silver sulfide catalyst. The efficiency of Ag2S/Ag heterostructures in the photocatalytic hydrogen production is shown for the first time.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Cu doped amine functionalized graphene oxide and its scope as catalyst for
           selective oxidation
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Surjyakanta Rana, Sreekantha B. Jonnalagadda
      We describe the synthesis of Cu doped amine functionalized graphene oxide (Cu@AGO) and its effective application as recyclable heterogeneous catalyst for selective partial oxidation of benzyl alcohols to corresponding benzaldehydes under mild conditions with acetonitrile as solvent. The Cu@AGO was fully characterized by XRD, FT-IR, Raman spectra, XPS, SEM and TEM analysis. FT-IR validated the successful grafting of organic amine with graphene oxide, while TEM confirmed the uniform distribution of metal particles on amine functionalized graphene oxide. The catalyst gave excellent conversion (92%) and selectivity (99%) towards benzaldehyde, with good reusability up to 4cycles.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • In-situ fabricated CuO nanowires/Cu foam as a monolithic catalyst for
           plasma-catalytic oxidation of toluene
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Minfang Zheng, Dongqi Yu, Lianjie Duan, Weihang Yu, Lei Huang
      Copper foam with in-situ grown CuO nanowires (CuO NW/Cu foam) was used as an effective monolithic catalyst for the plasma-catalytic oxidation of toluene to CO2. The fabricated CuO nanowires were single crystalline with a length of ~5–50μm and diameter of ~50–400nm. It was found that toluene conversion was obviously enhanced and byproducts were significantly decreased with the use of CuO NW/Cu foam as a monolithic catalyst due to synergistic effects developed between plasma and catalytic effect.

      PubDate: 2017-07-22T22:25:22Z
       
  • A novel ternary visible-light-driven photocatalyst AgCl/Ag3PO4/g-C3N4:
           Synthesis, characterization, photocatalytic activity for antibiotic
           degradation and mechanism analysis
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Li Zhou, Wei Zhang, Ling Chen, Huiping Deng, Junli Wan
      AgCl/Ag3PO4/g-C3N4 composites with different molar ratios of AgCl were synthesized using a facile anion-exchange method. The characterization analysis indicated that an AgCl film covered the Ag3PO4 nanoparticles in a core-shell structure, and that no Ag0 was produced in the preparation of hybrid photocatalyst. It was found that the composite photocatalyst AgCl/Ag3PO4/g-C3N4 (43%) exhibited the highest photocatalytic activity during the decomposition of sulfamethoxazole (SMX). The photogenerated and transferred holes on the valance band of g-C3N4 and produced Cl0 in AgCl were mainly the reactive oxidation species for SMX photodegradation.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Baeyer-Villiger oxidation of cyclohexanone with H2O2/acetonitrile over
           hydrotalcite-like catalysts: Effect of Mg/Al ratio on the ε-caprolactone
           yield
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Joanna Olszówka, Robert Karcz, Bogna D. Napruszewska, Dorota Duraczyńska, Adam Gaweł, Krzysztof Bahranowski, Ewa M. Serwicka
      Phase-pure magnesium-aluminium hydrotalcite-like compounds with molar ratios of Mg/Al ranging from 1.93 to 6.63 were synthesized and characterized with ICP OES, XRD, BET, and Raman spectroscopy. The materials were used as catalysts in the Baeyer-Villiger oxidation of cyclohexanone to ε-caprolactone with H2O2/acetonitrile oxidizing system in mild conditions (70°C, atmospheric pressure). Initial catalysts activity increased with growing Mg content/basicity, but after completion of the catalytic run best ε-caprolactone yield was obtained for the catalyst with Mg/Al=5.62. Poorer than expected performance of the material richest in magnesium was attributed to the enhanced leaching of Mg in the mildly acidic reaction environment. The occurrence of the homogeneous catalytic reaction involving leached magnesium has been excluded. Recycling experiments show that leaching of Mg causes partial deactivation, but the catalysts can be easily regenerated and regain the initial performance.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Preparation of Fe2P and FeP catalysts for the hydrotreating reactions
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Yamei Yuan, Heng Pei, Hui Chen, Li Zuo, Jianyi Shen
      Highly loaded iron phosphides were prepared by the phosphidation of unsupported Fe, 80%Fe/C and 60%Fe/C with Fe metal particle sizes of 38, 35 and 29nm, respectively, using triphenylphosphine in liquid phase. The large Fe particles such as those in the unsupported sample could not be phosphided completely, while the smaller ones in the 60%Fe/C could be completely phosphided into Fe2P at 543K for 18h and FeP at 593K for 33h, respectively. The FeP/C was found to be significantly more stable and thus generally more active than the Fe2P/C for the hydrotreating reactions.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Carbon nanosphere supported Ru catalyst for the synthesis of renewable
           herbicide and chemicals
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Dinesh Gupta, Basudeb Saha
      A carbon nanosphere supported Ru (Ru-CNS) effectively catalyzed the conversion of biorenewable platform chemicals to 5-aminoleulininc acid (ALA), furan alcohols and γ-valerolactone (GVL). The catalyst exhibits high activity for the investigated processes, enabling 76% ALA and >90% furan alcohols and GVL from their precursors. The effect of solvent polarity on the yield and selectivity of GVL and its ring-opening product has been studied with detailed characterization of the catalyst.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Novel Fe-Ce-O mixed metal oxides catalyst prepared by hydrothermal method
           for Hg0 oxidation in the presence of NH3
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Yuanyuan Wang, Huazhen Chang, Chuanning Shi, Lei Duan, Junhua Li, Guangming Zhang, Lei Guo, Yanchen You
      In this study, novel Fe-Ce-O mixed metal oxides were prepared by hydrothermal method. The Fe(0.3)-Ce-O catalyst showed excellent Hg0 oxidation performance in the presence of NH3, with high N2 selectivity (90% at 300°C) for NH3 oxidation. NH3-TPD indicated that a large concentration of acid sites appeared after CeO2 modification by Fe. The large surface area and Oα /(Oα +Oβ) ratio and the good Hg0 adsorption capacity were beneficial for Hg0 oxidation over the Fe(0.3)-Ce-O catalyst in the presence of NH3. Moreover, it was proposed that Hg0 was adsorbed in preference to NH3 on weak acid sites. Thus, the weak acid sites were crucial in Hg0 oxidation in the presence of NH3.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Magnetically recoverable hierarchical Pt/Fe2O3 microflower: Superior
           catalytic activity and stability for reduction of 4-nitrophenol
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Peng Zhang, Xiaoyan Yang, Hailong Peng, Dan Liu, Hui Lu, Junfu Wei, Jianzhou Gui
      Due to the excessive cost and scarcity of Pt metal, it is very vital to enhance the utilization efficiency and recovery yield of Pt-based catalysts. Herein, we employ a facile and simple approach to synthesize the hierarchical γ-Fe2O3 microflowers supported Pt, which is assembled from γ-Fe2O3 nanosheets as building blocks. Further analysis demonstrated that well-dispersed Pt nanoparticles with average size of 1.5nm are uniformly supported on the γ-Fe2O3 nanosheets and the hierarchical structure provides a large surface area and abundant macropores and mesopores. The resultant Pt/Fe2O3 microflowers show superior catalytic performance for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), including high conversion and excellent recycling durability. Furthermore, the unique magnetically separable property of the Pt/Fe2O3 microflowers makes their recovery easy after reaction using an external magnet, which not only saves the cost and time but also tremendously increases the recovery yield of catalyst. Consequently, the magnetically recoverable Pt/Fe2O3 catalyst with the facile synthesized strategy, good catalytic performance and high utilization efficiency would be well expected as a potential candidate for practical utilization.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Influence of nanoscale distribution of Pd particles in the mesopores of
           MCM-41 on the catalytic performance of Pd/MCM-41
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Chao Dong, Xiang Li, Anjie Wang, Yongying Chen, Haiou Liu
      Two different nanoscale Pd particle distributions in MCM-41, i.e. in the mesopores and on the external surface, were obtained by using a siliceous MCM-41 and a silylated MCM-41 (S-MCM-41) as the starting support materials, respectively. The electron density of Pd in Pd/S-MCM-41 was lower than that in Pd/MCM-41. Pd/S-MCM-41 exhibited much better selective hydrogenation performance but a lower hydrogenolysis activity than Pd/MCM-41. These differences are related to the different Pd particle distributions in MCM-41 and S-MCM-41, demonstrating that the performance of noble metal catalysts is tunable by simply controlling the nanoscale metal particle distribution in the pores.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Visible-photo catalytic performance and screening of sulfide-loaded g-C3N4
           composites in an aqueous reaction
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Jiabo Guo, Jianchao Lee, Wenxiao Wang, Xing Yan, Jinhong Gao, Yao Wang
      Decorated graphite-like carbon nitride (g-C3N4) exhibits high photo-catalytic activity and is a central research area in the field of energy shortage. In this reported study, g-C3N4 was used as a precursor from which six kinds of metal sulfides (Ce, Zn, Ni, Cu, Bi, In) were produced with varying atomic ratios. This library of thousands of catalysts was applied (MySx/g-C3N4) to a semiconductor chip using ink-jet printing and the active catalysts were selected employing high throughput screening. Using visible blue light, the high throughput technique revealed four very active catalysts (Ce0.06Ni0.19Bi0.08Zn0.04Cu0.13In0.50)S/g-C3N4, (Ce0.03Ni0.52Bi0.38Zn0.01Cu0.04In0.03)S/g-C3N4, (Ce0.19Ni0.10Bi0.08Zn0.11Cu0.22In0.28) S/g-C3N4, (Ce0.21Ni0.10Bi0.08Zn0.11Cu0.22In0.28)S/g-C3N4 and one catalyst with low catalytic activity (Ce0.05Ni0.08Bi0.17Zn0.33Cu0.24In0.12)S/g-C3N4.

      PubDate: 2017-07-22T22:25:22Z
       
  • Oxygen plasma-catalytic conversion of NO over MnOx: Formation and
           reactivity of adsorbed oxygen
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Jiangen Wang, Honghong Yi, Xiaolong Tang, Shunzheng Zhao, Fengyu Gao, Zhongyu Yang
      Dielectric barrier discharge (DBD) reactor packed with a MnOx catalyst was used to investigate nitric oxide (NO) conversion. Characterization of MnOx with and without O2 plasma treatment was carried out by powder XRD, XAFS, XPS and BET methods. The results show that plasma treatment increases the adsorbed oxygen on the surface of MnOx catalyst, and also changes the oxidation state of partial concentration of Mn cation from Mn(III) to Mn(IV). Reactive surface oxygen species can be generated from lattice oxygen and/or direct interaction with plasma generated species. The adsorbed oxygen species formed on the catalyst surface of MnOx can enhance the oxidation performance of the plasma-catalytic process.

      PubDate: 2017-07-22T22:25:22Z
       
  • CO preferential oxidation on Pt0.5Co0.5 and Pt-CoOx model catalysts:
           Catalytic performance and operando XRD studies
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): D.I. Potemkin, E.Yu. Filatov, A.V. Zadesenets, V.A. Sobyanin
      Nanopowders of unordered solid solution Pt0.5Co0.5 and metal-oxide composite Pt-CoOx were prepared via double complex salt [Pt(NH3)4][Co(C2O4)2(H2O)2]·2H2O decomposition in He and air streams, respectively. It was shown that, compared to metallic Pt nanopowder, both Pt0.5Co0.5 and Pt-CoOx exhibited high CO preferential oxidation (CO PROX) performance under mild conditions and provided complete CO conversion with 50–100% selectivity at near-ambient temperature and WHSV of 80,000cm3 g−1 h−1. Operando XRD study revealed that under CO PROX conditions Pt0.5Co0.5 was stable, while Pt-CoOx underwent reduction even at 50°C and consisted of Pt and Co nanoparticles. The high performance of both (alloyed and not alloyed) Pt-Co bimetallic systems exhibits the key role of Pt-Co interface, i.e. the so-called “ensemble effect”, in the synergism.
      Graphical abstract image

      PubDate: 2017-07-22T22:25:22Z
       
  • Facile synthesis of B, N co-doped three-dimensional porous graphitic
           carbon toward oxygen reduction reaction and oxygen evolution reaction
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Xiaobo Huang, Qing Wang, Dong Jiang, Yongmin Huang
      Heteroatom (B, N) co-doped three-dimensional (3D) porous graphitic carbon made from methyl violet and boric acid are fabricated via a super simple synthesis using silicon sphere as the hard-template. The 3D structure of as-prepared samples are analyzed by TEM, XRD and XPS. As resulted, the activity of BNC-800-800 in ORR and OER is better than sole-doped (NC-800) and dual-doped (NPC-800) hybrids. The strong synergistic effect with 3D porous structure, dual doping and high amount of pyridinic and pyrrolic nitrogen endows BNC-800 catalyst with an outstanding activity toward ORR and improved OER performance to commercial Pt/C catalyst under alkaline condition.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • In-situ preparation of ultra-small Pt nanoparticles within rod-shaped
           mesoporous silica particles: 3-D tomography and catalytic oxidation of
           n-hexane
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Laura Uson, Jose L. Hueso, Victor Sebastian, Raul Arenal, Ileana Florea, Silvia Irusta, Manuel Arruebo, Jesus Santamaria
      The shape and porous configuration of supports are key parameters to design outstanding catalysts. However, the selection of a proper mesoporous support, such as SBA-15, by itself does not guarantee accessibility to catalytic sites. The distribution of the active phase and its stability are strongly related to the procedure used to deposit it on the catalytic substrate. Herein, we have prepared rod-shaped SBA-15 silica supports functionalized with amine groups to facilitate the electrostatic attraction and a good distribution of the resulting Pt-based catalytic nanoparticles along the pore walls. Additionally, the use of tetrakis-(hydroxymethyl)-phosphonium chloride (THPC) as both reductant and stabilizer is presented as a novel alternative for Pt nanoparticle synthesis. The behaviour of this catalyst in the total oxidation of n-hexane demonstrates high activity and excellent stability after 70h on reaction stream. STEM-HAADF and 3-D tomography were used to confirm the presence of the metallic nanoparticles within the mesochannels and to corroborate their reduced sintering after reaction.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Novel MnOx-CeO2 nanosphere catalyst for low-temperature NH3-SCR
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Lulu Li, Bowen Sun, Jingfang Sun, Shuohan Yu, Chengyan Ge, Changjin Tang, Lin Dong
      A novel MnO x -CeO2 nanosphere catalyst with assembled structure from tiny particles was prepared and tested towards low-temperature NH3-SCR. A superior deNO x performance compared to that obtained over the catalyst composed of MnO x supported on CeO2 was obtained. A good resistance to high space velocity and SO2 present in the feed and an excellent stability (no deactivation was observed during 100-h of testing at 150°C) were obtained. The characterization results suggested that the higher specific surface area, better redox behavior and larger concentration of surface active oxygen species were responsible for the above mentioned excellent performance. The results of the present study suggest that control of catalyst morphology can be an effective strategy to upgrade low-temperature NH3-SCR performance.

      PubDate: 2017-07-09T04:11:48Z
       
  • N-alkyl ammonium perrhenate salts as catalysts for the epoxidation of
           olefins under mild conditions
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Mirza Cokoja, Robert M. Reich, Fritz E. Kühn
      A series of N-alkylammonium perrhenate salts [N(R1)3R2]+[ReO4]− with varying substituents R1 and R2 were synthesized and characterized and used as catalysts for the epoxidation of olefins. The effect of the substitution pattern on the catalytic activity was investigated.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Aggregates of nano-sized ZSM-5 crystals synthesized with template-free and
           alkali-treated seeds for improving the catalytic performance in MTP
           reaction
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Hengbao Chen, Yaquan Wang, Chao Sun, Fei Gao, Liying Sun, Cui Wang, Zhao Wang, Xiao Wang
      A seed-induced method was developed to synthesize aggregates of nano-sized ZSM-5 crystals by template-free MFI seeds and cetyltrimethyl ammonium bromide (CTAB). Various MFI zeolites after calcination, including: nano-sized silicate-1, nano-sized ZSM-5 aggregates and commercial bulk ZSM-5 crystals were used as seeds. A trace of CTAB could accelerate the crystallization and pure MFI structure was obtained in the presence of CTAB. More importantly, the aggregates of nano-sized ZSM-5 crystals were dramatically synthesized by transforming the bulk seeds into smaller sizes with NaOH treatment before crystallization. The resulting solid exhibited an excellent catalytic performance in the methanol to propylene reaction.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • A neutral and coordination regeneration method of Ca-poisoned
           V2O5-WO3/TiO2 SCR catalyst
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Xiansheng Li, Changdong Liu, Xiang Li, Yue Peng, Junhua Li
      Polyether surfactant was employed for the regeneration of a poisoned by calcium V2O5-WO3/TiO2 catalyst. The OP-10 (alkylphenol polyoxyethylene (10) ether) surfactant exhibited better CaO removal performance than EL-60 (cremophor EL 60) and AEO9 (polyethyleneglycol (9) mono-dodecyl ether). The Ca2+-aromatic interactions developed in OP-10 increased the solubility of CaO in water and Ca2+ could be removed by washing. The high Ca2+ removal rate by OP-10 surfactant led to the reversible improvement of surface acid sites and active oxygen species. Compared with the traditional method of dilute sulfuric acid solution, the OP-10 presented higher Ca2+ removal rate with lower V2O5 loss, which is expected to be a facile and environmental benign method for the regeneration of Ca2+-poisoned NH3-SCR industrial catalysts.

      PubDate: 2017-07-09T04:11:48Z
       
  • Novel W-modified SnMnCeOx catalyst for the selective catalytic reduction
           of NOx with NH3
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Tao Zhang, Feng Qiu, Huazhen Chang, Yue Peng, Junhua Li
      A series of W-modified SnMnCeO x catalysts was prepared by a co-precipitation method and investigated for the selective catalytic reduction (SCR) of NO x with NH3. It was found that W-modified SnMnCeO x catalyst enhanced not only the N2-selectivity but also the SO2 and H2O resistance of SnMnCeO x . Based on the H2-TPR and XPS results obtained, the decline of redox ability for W-modified SnMnCeO x catalysts might account for its excellent N2-selectivity. The results of NH3-TPD and in situ DRIFTS revealed that addition of W into the SnMnCeO x catalyst significantly increased its surface acidity.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Synthesis of lanthanide series (La, Ce, Pr, Eu & Gd) promoted
           Ni/γ-Al2O3 catalysts for methanation of CO2 at low temperature under
           atmospheric pressure
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Waqar Ahmad, Muhammad Naeem Younis, Reyad Shawabkeh, Shakeel Ahmed
      A series of Ni/γ-Al2O3 and 5%X-12%Ni/γ-Al2O3 (X=La, Ce, Pr, Eu & Gd) catalysts was synthesized by using aqueous incipient impregnation method for methanation of carbon dioxide. 5%Pr-12%Ni/γ-Al2O3 showed the highest CO2 conversion of 98.2% with 100% CH4 selectivity at 300°C for investigated reaction conditions. The catalyst activity was also tested for 48h which showed the stability of synthesized catalyst for CO2 conversion and CH4 selectivity. The TEM, BET and XRD analysis demonstrated the high metal dispersion, no remarkable effect on textural properties of 5%Pr-12%Ni/γ-Al2O3 as compared to 12%Ni/γ-Al2O3 and phases of alumina, nickel and lanthanide series promoters for γ-Al2O3 support, 12%Ni/γ-Al2O3 and 5%X-12%Ni/γ-Al2O3 catalysts.

      PubDate: 2017-07-09T04:11:48Z
       
  • Heterogeneous simplified Maruoka phase-transfer catalyst tethered on
           poly(styrene-co-acrylamide) microsphere: Structure-activity relationship
           in enantioselective α-alkylation
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Dandan Feng, Jingwei Wan, Fei Teng, Xuebing Ma
      The covalent immobilization of valuable simplified Maruoka catalyst onto poly(styrene-co-acrylamide)microsphere at different locations was developed for the first time through the copolymerization of Maruoka catalyst-functionalized styrene with styrene and acrylamide cross-linked by EGDMA. It was found the morphology, porous feature of microsphere and the anchor location of Maruoka catalyst were mainly responsible for the catalytic performance in heterogeneous α-alkylation. The catalyst poly[St-co-AA-co-(R)-11] with a rigid framework, where homogeneous (R)-11 was anchored at the 6, 6′-positions of binaphthyl skeleton, possessed the relatively larger surface area (33.5m2 g−1) and pore volume (1.27cm3 g−1) and displayed high yields (81–96%) and excellent enantioselectivities (96–97%ee) in enantioselective α-alkylation.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Highly selective photocatalytic reduction of carbon dioxide with water
           over silver-loaded calcium titanate
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Akihiko Anzai, Naoto Fukuo, Akira Yamamoto, Hisao Yoshida
      The once reported Ag-modified CaTiO3 photocatalyst was reexamined by optimizing the Ag loading amount and using a conventional photochemical reactor. This revealed that the Ag-modified CaTiO3 photocatalyst actually showed both high production rate of CO (54μmolh−1) and excellent selectivity towards CO formation (94%) by suppressing the H2 production via water splitting. It is suggested that the high photocatalytic performance originates from not only the optimized amount of cocatalyst and the high irradiation light intensity but also the high concentration of dissolved CO2 that was achieved by a bubbling flow of CO2 at the lower reaction temperature. These reaction conditions provided ca. 40 times higher CO formation rate. It was proposed that the deposited small Ag nanoparticles are the selective active sites for CO formation and the CaTiO3 crystal surface produces H2 preferably.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Solid sheet of anodic aluminium oxide supported palladium catalyst for
           Suzuki coupling reactions
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): YongLing Nong, NiNa Qiao, TianHui Deng, ZiNi Pan, Ying Liang
      A Pd(II) Schiff base complex supported on anodic aluminium oxide (with Al substrate sheet) was successfully prepared. The prepared nanocatalyst was characterized by SEM, TEM and XPS. The synthesized Pd-based catalyst showed excellent catalytic activity for Suzuki cross-coupling reactions under mild conditions. The catalytic activity did not deteriorate after five repeated cycles. Pd(II) Schiff base complex supported on solid sheets could be separated and recovered easily by taking it out of the reaction solution. The construction of solid sheet supported Pd catalyst would be expected to be a promising system to perform heterogeneous catalytic reactions.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Co-N-C catalysts supported on mesoporous carbon with tailorable pore sizes
           for selective oxidation of arylalkanes
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Shanshan Jie, Yuan Chen, Congqiang Yang, Xiu Lin, Runliang Zhu, Zhigang Liu
      Ordered mesoporous carbon supported Co-N-C catalysts (Co-N-C/OMC) were prepared through a combined method of impregnation and pyrolysis, in which the fabricated cobalt porphyrin and ordered mesoporous carbon (OMC) served as precursor and support, respectively. The catalysts displayed high activity toward the oxidation of arylalkanes. And the catalysts showed interconnected porous structure with tailorable pore sizes that could influence the catalytic performance. Furthermore, the catalysts showed an excellent catalytic activity and reusability, which was attributed to the synergistic effect between Co-N-C and OMC.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Effective anchoring of silver nanoparticles onto N-doped carbon with
           enhanced catalytic performance for the hydrogenation of dimethyl oxalate
           to methyl glycolate
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Menglin Hu, Yin Yan, Xinping Duan, Linmin Ye, Junfu Zhou, Haiqiang Lin, Youzhu Yuan
      Silver nanoparticles supported on nitrogen-doped activated carbon (Ag/AC-N) are demonstrated as promising catalysts for the chemoselective hydrogenation of dimethyl oxalate to methyl glycolate. Characteristic studies by TPR, XPS, and Raman indicate that AC-N benefits the dispersion of silver nanoparticles due to the strong electronic interactions between nitrogen and silver species. The optimized Ag/AC-N catalyst shows intensified performance in terms of high activity and excellent stability. It is inferred that the co-existence of Ag0 and Ag+ derived from the strong interactions of nitrogen with Ag species renders the superior catalytic performance of Ag/AC-N.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Visible-light-photoredox catalytic CC, CN bond formation: Synthesis of
           pyrazole derivatives via radical ions
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Hozeyfa Sagir, Pragati Rai, Afshan Ibad, Farah Ibad, I.R. Siddiqui
      A new approach for 5-amino-pyrazole-4-carbonitriles has been developed employing visible light photoredox catalysis. The green attributes of our work exploit on the utilization of visible light and Eosin Y organo photocatalyst as inexpensive, non-toxic, readily-available and eco-compatible reagents. In this strategy atmospheric O2 served as an. economical and eco sustainable desulfurizing agent, efficiently promotes the formation of CC and CN bonds in a simple one-pot operation under mild conditions thus increase the efficiency of proposed protocol.
      Graphical abstract image

      PubDate: 2017-07-09T04:11:48Z
       
  • Zr-modified hierarchical mordenite as heterogeneous catalyst for glycerol
           esterification
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Margarita Popova, Hristina Lazarova, Yuri Kalvachev, Totka Todorova, Ágnes Szegedi, Pavletta Shestakova, Gregor Mali, Venkata D.B.C. Dasireddy, Blaž Likozar
      Hierarchical mordenite catalysts were prepared by HF and NH4F etching. Materials' zirconia modification was performed by incipient wetness impregnation in order to vary surface acidity type and strength. XRD, N2 physisorption, solid-state NMR and UV–Vis spectroscopies were applied for characterization. Acidic properties of the obtained materials were investigated by TPD of adsorbed ammonia and FT-IR spectra of adsorbed pyridine. Catalytic performance was studied for the glycerol esterification with acetic acid. Zr increased reaction turnover activity compared to raw zeolite substrate due to abundant Brönsted and Lewis moiety presence. The demonstrated biomass valorization processes to bio-based platform chemicals are of interest, as they employ biodiesel production waste.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Catalytic upgrading of ethanol to n-butanol over M-CeO2/AC (M=Cu, Fe, Co,
           Ni and Pd) catalysts
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Xianyuan Wu, Geqian Fang, Zhe Liang, Wenhua Leng, Kaiyue Xu, Dahao Jiang, Jun Ni, Xiaonian Li
      M-CeO2/AC (M=Cu, Fe, Co, Ni and Pd) catalysts were prepared and evaluated in the continuous catalytic upgrading of ethanol to n-butanol under mild reaction conditions. The highest selectivity to n-butanol (67.6%) was achieved over Pd-CeO2/AC catalyst, while Cu-CeO2/AC catalyst exhibited the highest ethanol conversion (46.2%) with moderate selectivity to n-butanol (41.3%). The catalytic performance of these catalysts was shown for the first time to largely depend on the dehydrogenation, hydrogenation and CC bond cracking capabilities of each individual supported metal.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Shedding light on iron pentacarbonyl photochemistry through a CVD case
           study
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Hamed Nasri Lari, Donya Farhanian, Daria C. Boffito, Gregory S. Patience, Gregory De Crescenzo, Jamal Chaouki, Jason R. Tavares
      During our studies on surface engineering, we photopolymerize syngas onto silicon surfaces. XPS and TOF-SIMS analyses show that the syngas-derived oligomer covalently bonds to free silanol sites. Iron atoms appear in the coating, despite the fact that no iron was (intentionally) added to the system. GC–MS analysis reveals low concentrations of iron pentacarbonyl (IPC) are generated within the carbon monoxide cylinder. Its presence plays a determinant photocatalytic role in the reaction.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • RuO2/ZrO2 as an efficient reusable catalyst for the facile, green, one-pot
           synthesis of novel functionalized halopyridine derivatives
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Sandeep V.H.S. Bhaskaruni, Suresh Maddila, Werner E. van Zyl, Sreekantha B. Jonnalagadda
      Employing ethanol as solvent and RuO2/ZrO2 as heterogeneous catalyst, eleven novel halopyridines were synthesized in short reaction times (<20min). RuO2/ZrO2 was characterized by XRD, SEM, TEM and BET techniques. In the proficient one-pot, four-component approach, 11 functionalized halopyridine derivatives were synthesized by cyclocondensation of aromatic aldehydes, malononitrile, diethyl acetylenedicarboxylate and 3-chloro-4-fluoroaniline. The key benefits of the new method are green solvent, simple work-up, moderate reaction conditions and impressive yields (89–96%). The reaction products in the highly selective reaction are easily separable in pure form without involving any chromatographic separations.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Direct oxidation of benzene with molecular oxygen in liquid phase
           catalysed by heterogeneous copper complexes encapsulated in Y-type zeolite
           
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Atsushi Okemoto, Kohei Ueyama, Keita Taniya, Yuichi Ichihashi, Satoru Nishiyama
      Liquid-phase direct catalytic oxidation of benzene to phenol was performed by using a copper complex in Faujasite-type zeolite with molecular oxygen as an oxidant and sucrose as a reducing agent. Heterogenisation of the copper complex was achieved by a ship-in-a-bottle method, which enabled the encapsulation of the copper complex in the supercages of a Faujasite-type zeolite. Heterogenisation also provided the catalyst, reactant and the product in separate phases result that allowed their facile separation. All the prepared copper complex-based catalysts exhibited high activity and reusability for the direct oxidation of benzene to phenol. Based on differential thermal analysis, thermogravimetry (DTA-TG) and X-ray absorption fine structure (XAFS) measurements, it was confirmed that the copper complex was encapsulated in the supercages of Y-zeolite. The formation of phenol over the copper complex encapsulated in Y-zeolite was also investigated by using sucrose in the aqueous solution of acetic acid. Sucrose was an effective additive as a reducing agent because it was hydrolysed into two reducing sugars, namely glucose and fructose, under the reaction conditions applied. Overall, this work provides a successful approach for the potential use of heterogeneous metal complex catalysts suitable for liquid-phase oxidation reactions with molecular oxygen.

      PubDate: 2017-06-29T02:14:32Z
       
  • Facile synthesis of Ni nanoparticles from triangular Ni(HCO3)2 nanosheets
           as catalysts for hydrogen generation from hydrous hydrazine
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Hefang Wang, Luming Wu, Yansu Wang, Xiaona Li, Yanji Wang
      Noble-metal-free Ni nanoparticles without support and surfactant were prepared by H2 reduction of triangular Ni(HCO3)2 nanosheets obtained by a hydrothermal method and used in the catalytic hydrogen generation from hydrous hydrazine. The structure, morphology and element valence were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results demonstrate that, after reduction at 250°C, Ni nanoparticles are formed with uniform and relatively small size (25nm), which exhibit excellent catalytic performance and 100% selectivity to H2 for the decomposition of hydrous hydrazine.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Ionic liquid [Dabco-C8][FeCl4] as an efficient and recyclable catalyst for
           direct C3 alkylation of indoles with electron-deficient olefins
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Wan-Qi Su, Cheng Yang, Da-Zhen Xu
      In this paper, a simple and highly efficient Friedel–Crafts Michael–type addition of indoles to electron-deficient olefins was achieved by a new magnetic ionic liquid catalyst ([Dabco-C8][FeCl4]). This catalyst system is applicable to a variety of electron-deficient olefins, including chalcones, enones, and nitro-olefins, and affords the corresponding 3-alkylindole derivatives in good to excellent yields under mild conditions within short times. The catalyst can be recycled four times without considerable activity loss.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Elucidation of reaction mechanism for m-cresol hydrodeoxygenation over Fe
           based catalysts: A kinetic study
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Yongchun Hong, Yong Wang
      Fe based catalysts are promising for hydrodeoxygenation (HDO) of lignin derived phenolics due to their high selectivity for aromatics. In this work, the reaction mechanism of m-cresol HDO on Fe catalysts and the kinetic consequence with Pd addition were elucidated by examining the effect of H2, H2O and m-cresol pressures on toluene formation rate on Fe and PdFe catalysts. A direct CO bond cleavage mechanism is proposed for HDO catalysis on both Fe and PdFe catalysts, while Pd provides a facilitated reaction pathway at the PdFe interface and therefore promotes the catalysis on Fe without changing the high selectivity towards aromatics.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Synthesis and sulfation of titanium based metal organic framework; MIL-125
           and usage as catalyst in esterification reactions
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Esra Yılmaz, Emine Sert, Ferhan Sami Atalay
      In this study, titanium based metal organic framework, MIL-125, was synthesized and sulfated to gain the acidic property. The samples were characterized by XRD, TGA, N2 sorption–desorption measurements, SEM and FT-IR analysis. The catalytic activity of raw and sulfated MIL-125 was tested in esterification of acetic acid. The experiments were conducted by raw and sulfated MIL-125 to understand the positive effect of sulfation on the catalytic activity of MIL-125. Also, reusability of sulfated MIL-125 was investigated. By using sulfated MIL-125 as catalyst, high conversions were obtained in the production of esters which are among the most important chemical products.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Hierarchical hybrid MnO/Pd-Fe3O4 and CoO/Pd-Fe3O4 nanocomposites as
           efficient catalysts for hydroboration of styrene
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Hyunje Woo, Junha Park, Jiwoong Kim, Sungkyun Park, Kang Hyun Park
      We report a one-pot synthesis of hierarchical MnO/Pd-Fe3O4 and CoO/Pd-Fe3O4 nanocomposites containing scrolled multilayered nanosheets by controlled thermal decomposition of Fe(CO)5 and reduction of metal precursors [Pd(OAc)2]. During the synthetic process, particles of amorphous MnO and CoO are immobilized on the Pd-Fe3O4 support. These hierarchical nanocomposites follow a stepwise growth mechanism, initially forming Pd-Fe3O4 seeds aggregated from nuclei, followed by growth to produce multilayered MnO/Pd-Fe3O4 or CoO/Pd-Fe3O4 structures. To the best of our knowledge, this is the first report on the hydroboration of styrene with bis(pinacolato)diboron using heterogeneous nanocatalysts. Among these catalysts, CoO/Pd-Fe3O4 nanocomposites showed excellent performance due to the presence of a dual Pd and CoO catalytic system.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • A facile preparation of hierarchical dendritic zero-valent iron for
           Fenton-like degradation of phenol
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Qixing Xia, Zhaohua Jiang, Jiankang Wang, Zhongping Yao
      A simple, low-cost and high-efficient electrodeposition method was used to prepare three-dimensional hierarchical dendritic zero-valent iron (Feo) with large specific area as heterogeneous Fenton-like catalyst. 35ppm of phenol was removed up to 90% in 15min in 50mL Feo/H2O2 solution with Feo =100mg/L, pH=4.0 and H2O2 =6.0mmol/L. In the second or third run, the phenol removal efficiency still could reach ~70% in 60min. This study illustrates that dendritic Feo has a great potential in the fields of wastewater treatment containing persistent organic pollutants.

      PubDate: 2017-06-29T02:14:32Z
       
  • Solvent, metal and halogen-free synthesis of sulfoxides by using a
           recoverable heterogeneous urea-hydrogen peroxide silica-based oxidative
           catalytic system
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Mojtaba Azizi, Ali Maleki, Farahman Hakimpoor
      An efficient and green protocol was used for the selective oxidation of sulfides to sulfoxides by using silica sulfuric acid (SSA) as a recoverable heterogeneous solid acid catalyst in the presence of urea-hydrogen peroxide (UHP) under toxic transition metal-, solvent- and halogen-free conditions at room temperature. The present method offers several noteworthy advantages, such as high product yields, easy work-up, non-toxicity, easy preparation and reusability of the catalyst for at least six runs, which make this procedure the most convenient and attractive with low cost of catalyst and oxidant.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Carbon riveted Pt-MnO2/reduced graphene oxide anode catalyst for DMFC
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Weijian Yuan, Yufeng Zhang, Ningyuan Zhang, Congwen Yin, Xuelin Zhang, Xiaowei Liu
      Low activity and poor stability of catalyst has been the issue for the commercialization of DMFC. We introduced MnO2 as co-catalyst and used graphene as support for Pt nanoparticles. In situ carbonization using l-ascorbic acid as carbon source was further employed to boost the performance of the catalyst, where the carbon riveted Pt-MnO2/reduced graphene oxide prepared (PMGL) not only showed larger electrochemical surface area and better catalytic activity towards methanol oxidation, but also revealed stronger ability to resist CO poisoning and better stability than Pt-MnO2/rGO and Pt/rGO catalysts. The improvement of catalyst performance can be attributed to synergistic effects developed between MnO2 and Pt and the anchoring effect of l-ascorbic acid, as suggested by HR-TEM/EDX and XPS characterization studies.

      PubDate: 2017-06-29T02:14:32Z
       
  • A novel ring-like Fe2O3-based catalyst: Tungstophosphoric acid
           modification, NH3-SCR activity and tolerance to H2O and SO2
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Zhaoyong Ren, Hao Fan, Rui Wang
      A novel H3PW12O40·6H2O (HPW)-decorated ring-like Fe2O3 was synthesized via mechanical-chemistry grinding of HPW and Fe2O3 nanorings prepared by a microwave-assisted hydrothermal method. The catalyst presented nearly 100% NOx conversion at 300–400°C, a wide temperature window of 250–500°C with a NOx conversion above 90%, and an outstanding resistance against SO2 for the selective catalytic reduction of NOx by NH3 with a space velocity of 13,200h−1. The synergistic interaction of HPW polyoxoanions and Fe species, which occurs on both external and internal surfaces of the nanorings, plays a significant role in the excellent NH3-SCR performance.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • The role of acid/base properties in Ni/MgO-ZrO2–based catalysts for
           dry reforming of methane
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): J. Titus, M. Goepel, S.A. Schunk, N. Wilde, R. Gläser
      MgO-ZrO2 as a support material for DRM catalysts was prepared with varying MgO-content (12–68mol-%) relative to ZrO2. Characterizing the acid/base properties of MgO-ZrO2 materials with TPD-NH3 and TPD-CO2, the density of acid/base sites was found to significantly decrease with increasing calcination temperature (723K or 1123K). Nevertheless, in relation to the specific BET surface area, values are comparable for both calcination temperatures and both, acid/base sites. The impregnation of Ni only significantly influences the density of acid/basic sites if MgO-ZrO2 was treated at only 723K. Regarding the Ni-species available, melt-impregnation seems more suitable for DRM catalysts than wet-impregnation. In terms of catalytic activity in the DRM, results from an earlier work have been revisited with regard to the influence of MgO-content and basic sites.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Cu/g-C3N4 modified ZnO/Al2O3 catalyst: methanol yield improvement of CO2
           hydrogenation
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Kaixi Deng, Bing Hu, Qingye Lu, Xinlin Hong
      Replacing ZnO with g-C3N4-ZnO hybrid in Cu/ZnO/Al2O3 catalysts for CO2 hydrogenation leads to enhanced methanol yield and selectivity, which shows a volcano-type relationship with g-C3N4 amount (0–15wt% in g-C3N4-ZnO) in Cu/g-C3N4-ZnO/Al2O3 catalysts with the highest improvement at 5wt% g-C3N4. The methanol space-time yield reaches 5.73mmolh−1 gCu −1 (12bar, 250°C) for Cu/5wt%g-C3N4-ZnO/Al2O3, superior to the highest methanol yield (5.45mmolh−1 gCu −1) of industrial catalyst HiFUEL-R120 obtainable under the same pressure. Time-resolved photoluminescence, electronic spin resonance and temperature-programmed reduction characterizations support the promotion from enhanced strong metal-support interaction in modified catalysts caused by introduced electron-rich support.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • High stability of thiol-protected colloidal platinum nanoparticles with
           reduced ligand coverages in the hydrogenation of 3-hexyne
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Patricia Wand, Eva Kratzer, Ueli Heiz, Mirza Cokoja, Martin Tschurl
      The influence of different thiol ligands on the activity and particularly the stability of colloidal platinum nanoparticles is studied by using the catalytic semihydrogenation of 3-hexyne as model reaction. It is shown that a reduced ligand concentration during functionalization leads to an increase in the catalyst activity, while the stability of the particles as colloids in solution is surprisingly maintained, which also holds for the selectivity. Furthermore, it is demonstrated that the concept of reduced ligand coverages can also be applied to different thiol-based surfactants with varying steric demands. As shown for cyclohexanethiol-capped platinum nanoparticles, after eight recycling runs the particles maintain their activity and selectivity in all cycles. Electron microscopy further confirms that the particle size is preserved after the catalytic runs.
      Graphical abstract image

      PubDate: 2017-06-29T02:14:32Z
       
  • Photocatalytic oxidation of benzene in a microreactor with immobilized
           TiO2 thin films deposited by sputtering
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Akifumi Okawa, Ryuji Yoshida, Tasuku Isozaki, Yuzo Shigesato, Yoshihisa Matsushita, Tadashi Suzuki
      A microreactor with immobilized anatase TiO2 thin films, whose thickness and crystallinity were precisely controlled by sputtering technique, has been developed. Photocatalytic oxidation of benzene in the microreactor resulted in the direct production of hydroquinone with quite high yield by a four-hole reaction mechanism in contrast to a free phenol mechanism. The results indicate capabilities of microreactor with immobilized photocatalyst to be applied for organic synthesis involving multi-hole and/or multi-electron, which may provide new reaction selectivity not obtainable in the conventional batch reactors.
      Graphical abstract image

      PubDate: 2017-06-21T07:21:49Z
       
  • Selective reduction of NOx by C3H6 over Pd–NiO/(Y0.99Ba0.01)2O3
           under oxygen excess conditions
    • Abstract: Publication date: September 2017
      Source:Catalysis Communications, Volume 100
      Author(s): Lin Liu, Kohei Murakami, Shintaro Ida, Tatsumi Ishihara
      A Pd-NiO/Y(Ba)2O3 developed catalyst shows high activity to selective NOx reduction into N2 (yield ~70%) with C3H6 under oxygen excess conditions. Y(Ba)2O3 support material is active to NO direct decomposition at high temperatures and is considered to selectively adsorb NO. By depositing NiO and Pd simultaneously, high NO selective reduction activity is exhibited around 200°C and the activity is hardly affected by the addition of water in the feed stream.

      PubDate: 2017-06-21T07:21:49Z
       
 
 
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