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  Subjects -> ENGINEERING (Total: 2269 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: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 207)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
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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  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
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Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
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Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
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Arkiv för Matematik     Hybrid Journal  
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 9)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 8)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
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: 4)
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: 10)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 8)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
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Coastal Engineering Journal     Hybrid Journal   (Followers: 3)
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Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
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Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 242)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 175)
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Composites Science and Technology     Hybrid Journal   (Followers: 159)
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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: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
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CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        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  [3041 journals]
  • Coupling of ortho-chloronitrobenzene hydrogenation with 1,4-butanediol
           dehydrogenation over CuMgO catalysts: A hydrogen free process
    • Abstract: Publication date: 10 May 2017
      Source:Catalysis Communications, Volume 95
      Author(s): Kannapu Hari Prasad Reddy, Young-Woong Suh, Narani Anand, Burri David Raju, Kamaraju Seetha Rama Rao
      Aiming at an efficient method for the hydrogenation of o-chloronitrobenzene to o-chloroaniline under hydrogen free environment, the reaction was coupled with 1,4-butanediol dehydrogenation over CuMgO catalysts containing various amounts of copper loadings (5–20wt%). o-Chloroaniline and γ-butyrolactone were the main products with the yield of 85% and 90%, respectively. The main advantage of the coupling process was that the hydrogenation reaction was conducted at the lower temperature (523K) without external hydrogen supply when compared to the independent hydrogenation (648K). Catalysts were characterized using various analytical techniques such as BET, XRD, N2O pulse chemisorption, TPR-H2, XPS and CHNS analysis. From N2O characterization results, it was found that 10wt% CuMgO catalyst containing more surface Cu species (Cu0/Cu+1) showed a superior performance in the coupling process.
      Graphical abstract image

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

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

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

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

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

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

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

      PubDate: 2017-03-08T09:51:47Z
       
  • Synthesis of mesoporous Ni–La2O3/SiO2 by ploy(ethylene glycol)-assisted
           sol-gel route as highly efficient catalysts for dry reforming of methane
           with a H2/CO ratio of unity
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Chenju Chen, Xueguang Wang, Li Zhang, Xiujing Zou, Weizhong Ding, Xionggang Lu
      Mesoporous silica-supported Ni–La oxides with homogeneously-dispersed NiO nanoparticles were first synthesized via one-pot sol-gel route of tetraethoxysilane, metal nitrates, and poly(ethylene glycol). Upon reduction with H2, the NiO nanoparticles were reduced to in situ generate metallic Ni particles distributed in the matrices. The obtained Ni-La2O3/SiO2 catalysts exhibited high activity and excellent stability for DRM with an almost 100% H2 selectivity or a H2/CO molar ratio of unity. The presence of La significantly inhibited the reverse water gas shift reaction, resulting in a H2/CO ratio close to unity.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Chemical fixation of carbon dioxide catalyzed by magnetically recoverable
           NH2-MIL-101(Al) as an elegant nanoreactor
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Maryam Nourian, Farnaz Zadehahmadi, Reihaneh Kardanpour, Shahram Tangestaninejad, Majid Moghadam, Valiollah Mirkhani, Iraj Mohammadpoor-Baltork, Mehrnaz Bahadori
      A new heterogeneous catalyst, magnetic amino-MIL-101(Al), was synthesized based on the reaction of NH2-MIL-101(Al) and silica coated magnetic nanoparticles, Fe3O4@SiO2. The prepared catalyst was characterized by UV–vis, FT-IR, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) and inductively coupled plasma (ICP) methods. The catalytic activity of this new catalyst was investigated in the fixation of carbon dioxide with epoxides under atmospheric pressure at 100°C. Excellent yields, short reaction times and reusability without significant decrease in its initial activity are the advantages of this noble catalyst. Moreover, magnetic property of the catalyst allows easy separation by using an external magnetic field.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Functional-membrane coated Mn-La-Ce-Ni-Ox catalysts for selective
           catalytic reduction NO by NH3 at low-temperature
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Bo Yang, Yuesong Shen, Yun Su, Peiwen Li, Yanwei Zeng, Shubao Shen, Shemin Zhu
      Functional-membrane coated Mn-La-Ce-Ni-Ox catalysts for NH3-SCR at low-temperature were designed and prepared. The catalytic activity for NO removal and the anti-poison ability of catalyst were also investigated and discussed. Result showed that functional-membrane coated Mn-La-Ce-Ni-Ox catalysts had the highest NO removal efficiency of 93% at 180°C and after injecting 10vol% H2O and 300ppm of SO2, the NO removal efficiency still reached about 80%. The functional membrane could not only prevent H2O absorbing on the surface of catalyst and produce sulfur ammonium salt, but also effectively isolate the poison contacting catalyst active sites.

      PubDate: 2017-03-02T09:43:42Z
       
  • Preparation and high performance of rare earth modified Pt/MCM-41 for
           benzene catalytic combustion
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Shufeng Zuo, Xianqin Wang, Peng Yang, Chenze Qi
      A series of rare earth elements (REE)-modified Pt/MCM-41 catalysts were prepared. The effects of REE-doped MCM-41 on the performance of 0.2%Pt/MCM-41 and on benzene combustion were evaluated. XRD spectra and N2 adsorption show MCM-41 with high specific surface area and large pore volume has a highly ordered hexagonal mesostructure. The UV–vis DRS show that size of Pt particles changes in the trend of small size after adding Nd, and this result is in excellent agreement with the data obtained from HRTEM-EDS. The highest catalytic activity and durability of 0.2%Pt/6%Nd/MCM-41 is attributed to an optimized Nd content, Pt particles with smaller size and high Pt dispersion on MCM-41.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Metal-free protocol for the synthesis of N-arylpyrrolidines catalyzed by
           hydrogen iodine
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Tingting Hou, Chaofeng Zhang, Yehong Wang, Zhenting Liu, Zhixin Zhang, Feng Wang
      A metal-free and efficient approach to N-arylpyrrolidines from arylamines and cyclic ethers catalyzed by hydrogen iodine is described. In this protocol, no additive is added and a wide range of N-arylpyrrolidines are synthesized with up to 99% yield. Reaction mechanism involving iodine radical is proposed.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Conjugated copper(II) porphyrin polymer and N-hydroxyphthalimide as
           effective catalysts for selective oxidation of cyclohexylbenzene
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Zhiwei Tan, Junhui Zhu, Weijun Yang
      A nanomaterial catalyst of azo-bridged Cu(II) porphyrin polymer (CuII-APP) was synthesized and characterized by scanning electron microscopy, transmission electron microscopy and N2 adsorption measurement. CuII-APP had a nanoporous structure, with the particle size of about 30nm. Owing to the special structure, CuII-APP acted as an efficient heterogeneous catalyst for selective oxidation of cyclohexylbenzene into cyclohexylbenzene-1-hydroperoxide. When N-hydroxyphthalimide was used as co-catalyst, this binary catalyst system showed an obvious synergic effect. After being recovered and reused, CuII-APP and NHPI still had high catalytic activities.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • A novel nano-palladium catalyst for continuous-flow chemoselective
           hydrogenation reactions
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Ilona Goszewska, Damian Giziński, Małgorzata Zienkiewicz-Machnik, Dmytro Lisovytskiy, Kostyantyn Nikiforov, Joanna Masternak, Anna Śrębowata, Jacinto Sá
      Herein, we report a catalyst composed of palladium nanoparticles immobilized on polymeric resin for chemoselective hydrogenation reactions under flow conditions. The catalyst exhibits high activity and selectivity towards hydrogenation of CC double bond, as confirmed in the hydrogenation of 2-heptene and 6-methyl-5-hepten-2-one.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Cationic acetylacetonate palladium complexes/boron trifluoride etherate
           catalyst systems for hydroamination of vinylarenes using arylamines
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): D.S. Suslov, M.V. Bykov, M.V. Pakhomova, P.A. Abramov, I.A. Ushakov, V.S. Tkach
      A simple and solvent-free protocol using cationic acetylacetonate palladium complexes with mono-/bidentate phosphine ligands activated with BF3·OEt2 as in situ-formed catalyst for hydroamination of vinylarenes with arylamines have been developed. Excellent catalytic activities were obtained using [Pd(acac)(PPh3)2][BF4]/BF3·OEt2/i-PrOH catalyst system with the addition of a small amount of palladium (0.2–0.05mol%) to the reaction mixture. Furthermore, the novel unexpected diphosphine-bridged palladium complexes have been prepared and characterized: [Pd(acac)(dpppt)]2[BF4]2 and [Pd(acac)(dpph)]2[BF4]2 (dpppt – 1,5-bis(diphenylphosphino)pentane, dpph – 1,6-bis(diphenylphosphino)hexane)

      PubDate: 2017-03-02T09:43:42Z
       
  • Infrared radiation promoted preparation of cost-effective lamb bone
           supported cobalt catalyst: Efficacy in semi-batch monoolein synthesis
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Punam Mukhopadhyay, Rajat Chakraborty
      A series of highly efficient inexpensive hydroxyapatite (lamb bone derived) supported cobalt solid acid catalysts were developed via both conventional and infrared radiation (IRR) activation methods. The IRR activated catalysts demonstrated remarkable efficacy in accelerating semi-batch glycerol esterification with oleic acid (OA), rendering 98% OA conversion within much shorter time (80min). The IRR promoted optimal catalyst (164.68±0.2m2/g BET area and 7.16mmol/g acid-site concentration) demonstrated significantly greater monooleate selectivity (95±4%) and yield (87±1%) than conventionally prepared catalyst (68±1% yield and 83±1% selectivity). The results explore promising application of IRR in improvement of catalytic properties over conventional method.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Synthesis of novel d-glucose based anionic bolaamphiphiles and their
           catalytic application in 1,3-dipolar nitrone cycloaddition reactions
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Vikash Kumar, Amrita Chatterjee, Biswajit Gopal Roy, Mainak Banerjee
      Three d-glucose based bolaamphiphiles have been synthesized by a simple and efficient synthetic methodology utilizing the free C-3 hydroxyl group of diisopropylidene glucose. The resulting bolaamphiphiles showed unique aggregation behavior in aqueous solution, e.g. transformation of vesicle to tubular morphology on aging. The chiral hydrophobic interior of these vesicles was utilized as tiny reaction vessels to carry out 1,3-dipolar nitrone cycloadditions in water. The corresponding isoxazolidine derivatives were formed with high diastereoselectivity in several cases. The bolaamphiphile with 12 carbon spacer (5c) showed better diastereoselectivity among the rest with just 2mol% of catalyst loading and can be reused.
      Graphical abstract image

      PubDate: 2017-03-02T09:43:42Z
       
  • Enhancement of washcoat adhesion for SCR catalysts to convert nitrogen
           oxide using powder spray coating of TiO2 on metallic honeycomb substrate
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Jiseop Hwang, Ho-Jung Ha, Jungho Ryu, Jong-Jin Choi, Cheol-Woo Ahn, Jong-Woo Kim, Byung-Dong Hahn, Woon-Ha Yoon, Heesoo Lee, Joon-Hwan Choi
      A novel powder spray coating method was applied to form intermediate layers on metallic honeycomb substrates to improve the adhesion property of ceramic-based washcoat layer without any binder addition. Washcoating of SCR catalysts for abatement of nitrogen oxides was performed with different numbers of coating and different amounts of washcoat loading. Metallic monoliths with the intermediate layer showed much better washcoat adhesion property than monoliths without the layer even with high washcoat loading. The surface-modified monoliths had better NO conversion performance than the samples without the intermediate layer after ultrasonic vibration test to measure adhesion property of the washcoat layers.
      Graphical abstract image

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

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

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

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

      PubDate: 2017-02-23T04:03:49Z
       
  • N-doped graphene as a potential catalyst for the direct catalytic
           decomposition of NO
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Yan Wang, Yuesong Shen, Shemin Zhu
      For the first time, it was experimentally confirmed that N-doped graphene could efficiently catalytically decompose NO to N2, which proves that the N-doped graphene can be used in the direct catalytic decomposition reaction and that it is a potential catalytic material for the removal of NO.
      Graphical abstract image

      PubDate: 2017-02-23T04:03:49Z
       
  • Nano cobalt ferrite catalyzed coupling reaction of nitroarene and alkyl
           halide: An odorless and ligand-free rout to unsymmetrical thioether
           synthesis
    • Abstract: Publication date: 5 May 2017
      Source:Catalysis Communications, Volume 94
      Author(s): Firouz Matloubi Moghaddam, Raheleh Pourkaveh
      This study describes an odorless protocol for the synthesis of unsymmetrical sulfides via cobalt ferrite (CoFe2O4) catalyzed cross-coupling reaction of nitroarenes with alkyl halides in the presence of thiourea as sulfur source under ligand-free conditions. The catalyst was recycled using external magnetic field and reused for ten consecutive runs in the reaction of nitrobenzene, thiourea and benzyl bromide without significant loss of activity. Apart from being magnetically separable, being inexpensive and air-stable are another important features of this catalytic system. All the products were formed in good yields and short reaction times.
      Graphical abstract image

      PubDate: 2017-02-23T04:03:49Z
       
  • Surface enrichment of Pt in stable Pt-Ir nano-alloy particles on MgAl2O4
           spinel in oxidizing atmosphere
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Wei-Zhen Li, Lei Nie, Yingwen Chen, Libor Kovarik, Jun Liu, Yong Wang
      With the capability of MgAl2O4 spinel {111} nano-facets in stabilizing small Rh, Ir and Pt particles, bimetallic Ir-Pt catalysts on the same support were investigated, aiming at further lowering the catalyst cost by substituting expensive Pt with cheaper Ir in the bulk. Small Pt-Ir nano-alloy particles (<2nm) were successfully stabilized on the spinel {111} nano-facets as expected. Interestingly, methanol oxidative dehydrogenation (ODH) rate on the surface Pt atoms increases with oxidizing aging but decreases upon reducing treatment, where Ir is almost inactive under the same reaction conditions. Up to three times enhancement in Pt exposure was achieved when the sample was oxidized at 800°C in air for 1week and subsequently reduced by H2 for 2h, demonstrating successful surface enrichment of Pt on Pt-Ir nano-alloy particles. A dynamic stabilization mechanism involving wetting/nucleation seems to be responsible for the evolution of surface compositions upon cyclic oxidizing and reducing thermal treatments.
      Graphical abstract image

      PubDate: 2017-02-16T02:45:12Z
       
  • Removal of elemental mercury by Ce-Mn co-modified activated carbon
           catalyst
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Jiang Wu, Zhen Zhao, Tianfang Huang, Pengfei Sheng, Jing Zhang, Huan Tian, Xuying Zhao, Lili Zhao, Ping He, Jianxing Ren, Kunfeng Gao
      A series of CeO2 modified and Ce-Mn co-modified activated carbons (AC) were prepared for the gas-phase elemental mercury (Hg0) removal experiment under N2 atmosphere. The loading of CeO2 ranged from1wt.% to 7wt.%, and the mass ratio of manganese to cerium was 0.7. The BET results indicated that the big surface area and pore volume benefited the physical adsorption of Hg0. The XPS results indicated the existence of the Ce3+/Ce4+ redox couple and multiple valence state Mn ions, and Ce4+ and Mn4+ species released lattice oxygen to promote the Hg0 oxidation. The experimental results showed the 3wt.% CeO2-Mn(0.7)/AC was the optimal sample at 120°C.

      PubDate: 2017-02-16T02:45:12Z
       
  • Potential application of Ni and Co stabilized zirconia as oxygen reduction
           reaction catalyst
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Florentina Neațu, Mihaela M. Trandafir, Maria Marcu, Loredana Preda, Jose Maria Calderon-Moreno, Ștefan Neațu, Simona Somacescu, Mihaela Florea
      A new facile template method for the preparation of Ni, Co doped ZrO2 self-assembled electrocatalysts for oxygen reduction reaction was employed. The effect of the Ni and Co incorporation into ZrO2 lattice on the structural, textural, surface chemistry and its activity on ORR was emphasized. As X-ray diffraction reveals, the pseudo-cubic lattice of the tetragonal ZrO2 polymorph (t-ZrO2) is stabilized when Ni and Co are co-doping ZrO2. The results indicate that the synergetic effects arisen from the intimate electronic interaction of the mixed oxides present in the lattice of the zirconia phase, i.e. Ni1−xCoxO (or NiO and CoO) in NCZ enhance the electrocatalytic activity of the catalyst.
      Graphical abstract image

      PubDate: 2017-02-10T04:38:18Z
       
  • Acetylene mediated synthesis of Au/graphene nanocomposite for selective
           hydrogenation
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Ting Wei, Jiaqiang Sun, Fengwei Zhang, Juan Zhang, Jiangang Chen, Huan Li, Xian-Ming Zhang
      We report a facile synthesis method of ultrasmall Au/unmodified graphene nanocomposite, in which acetylene functions as both a reducing agent and precursor to the Au surface capping agent. Its activity in hydrogenation of halogenated nitrobenzene and the deactivation mechanism in the presence of O2 were also investigated.

      PubDate: 2017-02-10T04:38:18Z
       
  • Activated carbon supported palladium-iron oxide catalysts fabricated by
           atomic layer deposition for hydrodechlorination of 1,4-dichlorobenzene
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Wangle Zhang, Yu Huang, Ting Gong, Hao Feng
      Fe2O3 and Pd are successively deposited on an activated carbon support by atomic layer deposition (ALD), producing a large surface area catalyst containing varied loadings of Pd and Fe2O3. Various structural characterization techniques reveal that the Fe2O3 species forms a uniformly distributed amorphous layer on which Pd nanoparticles are anchored. In the hydrodechlorination of 1,4-dichlorobenzene ALD Pd/Fe2O3/AC catalysts outperform a series of control samples including impregnated Pd-Fe2O3-AC and mixtures of ALD Pd/AC and Fe2O3/AC. The improved catalytic performance is mostly attributed to the anti-poisoning effect of Fe2O3 located in close vicinity to Pd.
      Graphical abstract image

      PubDate: 2017-02-10T04:38:18Z
       
  • The supported sulphated La2O3-ZrO2 on SBA-15 as a promising mesoporous
           solid superacid catalyst for alkenylation of p-xylene with phenylacetylene
           
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Zhongkui Zhao, Yongle Guo
      The well-dispersed supported sulphated La2O3-ZrO2 (SLZ) superacid catalysts on SBA-15 with loadings were prepared and applied in alkenylation of p-xylene with phenylacetylene. The amount of acidic sites increases with the enlarged loading, it reaches maximum at the loading of 25%, and then decreases while the loading is further increased. The increasing loading leads to a continuous decrease in specific surface area and pore volume. The optimized 25% SLZ/SBA-15 catalyst shows the outstanding catalytic performance, attributed to the more acidic sites and the not too low surface area and pore volume. The developed well-ordered mesoporous sulphated La2O3-ZrO2 solid superacid catalyst may be extended to diverse transformations.
      Graphical abstract image

      PubDate: 2017-02-10T04:38:18Z
       
  • A strategy for preparing highly dispersed Ni2P/functionalized CMK-3
           catalysts with superior hydrodesulfurization performance
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Tingting Huang, Wenjin Shi, Jundong Xu, Yu Fan
      A strategy is introduced for producing highly dispersed Ni2P/functionalized CMK-3 hydrodesulfurization catalysts via the anchoring effect of high-temperature stable groups activated by ammonia. In the proposed method, HNO3 acts as an oxidant that enables original CMK-3 to create more lactones and phenolic hydroxyls than acidified ammonium persulphate; these groups are activated with negative charges via the NH3 effect, and thereby [Ni(NH3)6]2+ ions can be anchored to the electronegative surface of functionalized CMK-3 via electrostatic adsorption. As a result, NiO and phosphatized Ni2P nanoparticles are highly dispersed on the HNO3-oxidized CMK-3 support, endowing the catalyst with excellent activity for 4,6-dimethyldibenzothiophene hydrodesulfurization.
      Graphical abstract image

      PubDate: 2017-02-03T04:17:07Z
       
  • Flow-based stereoselective reduction of ketones using an immobilized
           ketoreductase/glucose dehydrogenase mixed bed system
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Federica Dall'Oglio, Martina Letizia Contente, Paola Conti, Francesco Molinari, Danila Monfredi, Andrea Pinto, Diego Romano, Daniela Ubiali, Lucia Tamborini, Immacolata Serra
      A robust two-enzyme system composed of an immobilized ketoreductase (KRED1-Pglu) and a glucose dehydrogenase (BmGDH) was developed via immobilization on aldehyde agarose for the stereoselective reduction of different ketones. The immobilized ketoreductase/glucose dehydrogenase system was continuously used in a flow reactor for weeks, even in the presence of concentrations of DMSO up to 20%.
      Graphical abstract image

      PubDate: 2017-02-03T04:17:07Z
       
  • Comparative study on sulfur poisoning of V2O5-Sb2O3/TiO2 and V2O5-WO3/TiO2
           monolithic catalysts for low-temperature NH3-SCR
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Tengfei Xu, Xiaodong Wu, Yuxi Gao, Qiwei Lin, Jianfeng Hu, Duan Weng
      The V2O5-Sb2O3/TiO2 monolithic catalyst prepared by an impregnation method showed superior deNO x performance compared with the commercial V2O5-WO3/TiO2 catalyst in the presence of sulfur dioxide. In addition, it exhibited remarkable sulfur resistance at 250°C for 30h test due to the low deposition of NH4HSO4, suggested by the TG and MS results. The lower SO2 oxidation and higher reactivity of NH4HSO4 with NO are the key factors for the low deposition of NH4HSO4 over this Sb-modified monolithic catalyst.
      Graphical abstract image

      PubDate: 2017-02-03T04:17:07Z
       
  • A green catalytic method for selective synthesis of iodophenols via
           aerobic oxyiodination under organic solvent-free conditions
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Hongchuan Xin, Liangning Hu, Jianqiang Yu, Wenshou Sun, Zengjian An
      A highly efficient catalytic method for aerobic oxyiodination of various phenols catalysed by copper(II) nitrate was achieved under mild conditions using I2 as an iodinating reagent, molecular oxygen as an oxidant, and water as a solvent. The catalyst shows not only high activity for phenols with either electron-donating or electron-withdrawing groups, but also a remarkable selectivity for the formation of para-iodo substituted phenols. This study offers a green method for iodination of aromatic phenols with high atom economy.
      Graphical abstract image

      PubDate: 2017-01-27T10:40:26Z
       
  • Hydrogen production from the decomposition of hydrogen iodide over
           nanosized nickel-oxide-zirconia catalysts prepared by solution-combustion
           techniques
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Amit Singhania, Venkatesan V. Krishnan, Ashok N. Bhaskarwar, Bharat Bhargava, Damaraju Parvatalu, Satinath Banerjee
      NiO/ZrO2 prepared by solution-combustion method (SCM) showed near equilibrium conversions of hydrogen iodide to hydrogen and iodine at 500°C–550°C without any performance degradation over 50h. XRD data of the catalyst after 10h of reaction were compared with the same after a TPR step in H2/Ar on another catalyst sample, to verify Ni-ex-solution. Ni is clearly visible in the XRD after TPR, although it was not observed under reaction conditions (HI/H2O/N2), even after 10h. Instead, the onset of monoclinic ZrO2 is observed after reaction, which was not visible after TPR.
      Graphical abstract image

      PubDate: 2017-01-27T10:40:26Z
       
  • Self-assembled Pd/CeO2 catalysts by a facile redox approach for
           high-efficiency hydrogenation of levulinic acid into gamma-valerolactone
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Yong Zhang, Chun Chen, Wanbing Gong, Jieyao Song, Haimin Zhang, Yunxia Zhang, Guozhong Wang, Huijun Zhao
      A series of self-assembled Pd/CeO2 catalysts were synthesized by a facile one-pot redox method, demonstrating high catalytic performance in hydrogenation of levulinic acid. Under optimized conditions, almost 100% gamma-valerolactone yield was achieved using Pd/CeO2 catalyst with only slight activity loss (ca. 4%) after five continuous runs. Combined with relevant characterization techniques, the superior catalytic hydrogenation performance could be attributed to Pd/CeO2 catalyst with noticeable advantages of high surface area beneficial to the exposure of Pd catalytic active sites and increase electron density of Pd favorable for the dissociation of H2 as well as the defects sites of CeO2 responsible for esterification of intermediate.
      Graphical abstract image

      PubDate: 2017-01-27T10:40:26Z
       
  • Characteristics of selective catalytic reduction (SCR) catalyst adding
           graphene-tungsten nanocomposite
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Bora Jeong, Bora Ye, Eok-Soo Kim, Hong-Dae Kim
      Graphene-supported tungsten (WO3) nanocomposite with different WO3 loadings as synthesized using an impregnation method. The dispersion of graphene-WO3 nanocomposite was confirmed using transmission electron microscopy. Then selective catalytic reduction (SCR) catalysts that using the graphene-WO3 nanocomposite was fabricated and their catalytic properties were evaluated. Due to its high specific surface area, graphene can nano-disperse WO3 and consequently improve its catalytic properties. The use of the graphene-WO3 nanocomposite alleviates the adverse effect of NH3 has on the NO reduction by the catalyst. The addition of the graphene-WO3 nanocomposite to the catalyst increases its NOX-removal efficiency to 80% over a temperature range of 150–450°C. Furthermore, the addition of the graphene-WO3 nanocomposite decreased the SO2-SO3 conversion to <1%.

      PubDate: 2017-01-27T10:40:26Z
       
  • Catalytic conversion of carbohydrates to levulinic acid with mesoporous
           niobium-containing oxides
    • Abstract: Publication date: April 2017
      Source:Catalysis Communications, Volume 93
      Author(s): Yanxiu Liu, Hu Li, Jian He, Wenfeng Zhao, Tingting Yang, Song Yang
      A series of niobium-containing catalysts were prepared by hydrothermal synthesis method, and characterized by NH3-TPD, TEM, XRD, N2 adsorption-desorption and pyridine-adsorption FT-IR techniques. Fe-NbP (Fe-doped niobium phosphate) with higher total acid density (3.59mmol/g) and appropriate Brønsted/Lewis acid ratio (1.32) was found to show superior activity in production of levulinic acid (LA) from glucose, and a high LA yield of 64.2% was achieved at 180°C in 3.0h. The effect of various reaction parameters such as temperature, time, catalyst dosage, and substrate concentration on LA production has been investigated. The catalyst can be recycled for several times without significant loss of activity.
      Graphical abstract image

      PubDate: 2017-01-27T10:40:26Z
       
  • m-Cresol methylation: Role of internal and external acid sites in the
           product distribution
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): M.D. Acevedo, M.K. Montañez-Valencia, N.B. Okulik, M.E. Sad, C.L. Padró
      The effect of the porous structure and the role of internal and external acid sites in product distribution in gas-phase alkylation of m-cresol with methanol were studied on zeolites HBEA, HZSM5 and HMCM22. Catalysts were characterized by N2 physisorption and FTIR of adsorbed pyridine. Trimethylated product formation was inhibited in narrower pore size zeolites (HMCM22 and HZSM5) and a preferential selectivity to smallest dimethylphenol isomer (2,5-dimethylphenol) was observed. The selectivity to 2,5-dimethylphenol on HMCM22 reached a value of 82% after suppressing the acid sites of the external cavities and pore mouth using 2,4-dimethylquinoline, which is a basic molecule too bulky to diffuse through the narrow pores of these zeolites.
      Graphical abstract image

      PubDate: 2017-01-13T08:38:10Z
       
  • La0.8M0.2MnO3 (M=Ba, Ca, Ce, Mg and Sr) perovskite catalysts for
           plasma-catalytic oxidation of ethyl acetate
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Xinbo Zhu, Xin Tu, Menghan Chen, Yang Yang, Chenghang Zheng, Jinsong Zhou, Xiang Gao
      Plasma-catalytic removal of low concentration ethyl acetate was carried out over La0.8M0.2MnO3 (M=Ba, Ca, Ce, Mg and Sr) catalysts prepared by sol-gel method using citric acid as a mixing complex. The La0.8Ce0.2MnO3 catalyst showed the highest removal of ethyl acetate and CO2 selectivity over the specific energy density (SED) range followed by the La0.8Sr0.2MnO3 catalyst, while Ba, Ca and Mg-doped catalysts inhibited the oxidation of ethyl acetate compared to the pure LaMnO3 catalyst. A wide range of catalyst characterization including N2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction by H2 (H2-TPR) indicated that the reducibility of the catalysts played an important role in determining the reaction performance of the plasma-catalytic gas cleaning process.
      Graphical abstract image

      PubDate: 2017-01-13T08:38:10Z
       
  • Carbon coated copper nanostructures as a green and ligand free
           nanocatalyst for Suzuki cross-coupling reaction
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Kamran Lamei, Hossein Eshghi, Mehdi Bakavoli, Seyyed Amin Rounaghi, Elaheh Esmaeili
      In this work, carbon coated copper nanoparticles and nanowires were synthesized as a ligand free nanocatalyst that naturally contains ppm levels of Pd with no post-modification via a two-steps reduction-hydrothermal process. Transmittance electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction, inductively coupled plasma optical emission spectrometry (ICP-OES), and Raman spectroscopy were employed for the characterization of the nano-catalyst. The utilization of the synthesized Cu/C nano-catalyst in Suzuki cross coupling reaction showed a high performance in the synthesis of various biaryls in water. Moreover, this catalyst reused successfully with no significant yield decrease even after four subsequently runs.

      PubDate: 2017-01-13T08:38:10Z
       
  • Hydrogenation of ketones with a manganese PN3P pincer pre-catalyst
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Antoine Bruneau-Voisine, Ding Wang, Thierry Roisnel, Christophe Darcel, Jean-Baptiste Sortais
      A catalytic hydrogenation of carbonyl derivatives with a manganese pre-catalyst has been developed. The key feature is the use of an air stable cationic manganese pre-catalyst bearing a tridendate ligand with a 2,6-(diaminopyridinyl)diphosphine scaffold. Under 50bar of H2, at 130°C, various ketones were reduced to the corresponding alcohols with moderate to good yield.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
  • 1,1,3,3-Tetramethylguanidine immobilized on graphene oxide: A highly
           active and selective heterogeneous catalyst for Aldol reaction
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Shunmin Ding, Xiaohui Liu, Weiming Xiao, Mengmeng Li, Yanan Pan, Jingwei Hu, Ning Zhang
      Developing efficient catalysts with high yields of aldol products in the aldol reaction is of great importance and remains a challenge. By a facile route utilizing hydrogen bonding, 1,1,3,3-tetramethylguanidine was successfully loaded on graphene oxide to afford a immobilized catalyst. This immobilized catalyst shows an excellent conversion of 97.3% with a high aldol product selectivity of 92.5% in the aldol reaction of p-nitrobenzaldehyde with acetone, which is superior to the corresponding homogeneous catalyst with a conversion of 97.1% and selectivity of only 59.5% under similar conditions. Furthermore, the immobilized catalyst can be easily recovered and reused without significant loss of the reactivity.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
  • Enhanced removal of toluene by dielectric barrier discharge coupling with
           Cu-Ce-Zr supported ZSM-5/TiO2/Al2O3
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Baojuan Dou, Deliang Liu, Qing Zhang, Ruozhu Zhao, Qinglan Hao, Feng Bin, Jingguo Cao
      Toluene was removed by dielectric barrier discharge coupling with Cu-Ce-Zr supported ZSM-5/TiO2/Al2O3 catalysts. Copper, cerium, and zirconium species were highly dispersed on the support surface, and copper was mostly in Cu2+ and Cu+ state co-existed. The reaction process of toluene removal in the plasma-catalyst system was influenced by the support of the catalyst and it could be divided into three steps. Pure plasma and thermal catalytic chemistry triggered by background temperature played different roles in the different step. Large pore size, more oxygen vacancy and lattice oxygen in the CuCeZr/TiO2 were responsible to the excellent toluene removal, CO2 selectivity and energy yield.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
  • Low temperature dry reforming of methane over Pd-CeO2 nanocatalyst
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Rajib Kumar Singha, Aditya Yadav, Astha Shukla, Manoj Kumar, Rajaram Bal
      Pd-CeO2 nanocrystals were prepared using a simple surfactant induced method, which initiated dry reforming of methane reaction only at 350°C. Low temperature activity of the prepared catalyst was due to high Pd-dispersion and very good redox property of support Ceria (20–50nm) nanocrystals (32.8% Ce+3 concentrations). The catalyst was found to be very good coke resisting and inhibited deactivation by coke formation during catalysis. Time on stream (TOS) study was carried out for 12h and slight decrease in conversion was observed due to sintering, re-oxidation and hydroxylation of the active Pd-nanoparticles.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
  • Reduction of HCHO with OH− on Pt loading anatase TiO2 (001) surface:
           A DFT calculation
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Zongbao Li, Xia Wang, Lichao Jia, Xiaobo Xing
      Using the first principle density function theory, based on the stabilized Pt/TiO2 (001) structure, the adsorptions and reactions of the substances that may be involved in the reactions have been calculated. The most possible reaction path and reaction mechanism are obtained by the analysis of the adsorption energies and formation energies in reaction. The results indicate that the OH− plays an important role in the HCHO degradation process. The reaction can be expressed as HCHO+2OH− →HCOOH+H2O and HCOOH+2OH− →CO2 +2H2O, which is carried out continuously with a large heat release.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
  • Ammoxidation of propane to acrylonitrile over Mo-V-P-Oy/Al2O3 catalysts:
           Effect of phosphorus content
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Minsung Baek, Jong Kwon Lee, Heung Jung Kang, Bum Jin Kwon, Ji Hye Lee, In Kyu Song
      Mo-V-P-Oy/Al2O3 (denoted as 18.1Mo1.9VXP/Al: 18.1wt% Mo, 1.9wt%V, Xwt% P) catalysts with different phosphorus content were prepared by an impregnation method, and they were applied to the acrylonitrile production by ammoxidation of propane. The effect of phosphorus content on the physicochemical properties and catalytic activities was investigated. Conversion of propane and yield for acrylonitrile showed volcano-shaped trends with respect to phosphorus content. Yield for acrylonitrile increased with decreasing binding energy of Mo 3d5/2. Among the catalysts, 18.1Mo1.9V0.6P/Al with the smallest binding energy of Mo 3d5/2 showed the best catalytic performance in the ammoxidation of propane to acrylonitrile.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
  • Synthesis and characterization of amine functionalized graphene oxide and
           scope as catalyst for Knoevenagel condensation reaction
    • Abstract: Publication date: 10 March 2017
      Source:Catalysis Communications, Volume 92
      Author(s): Surjyakanta Rana, Sreekantha B. Jonnalagadda
      Novel amine modified graphene oxide (APTES-GO) was prepared using organo silane (aminopropyltrimethoxysilane, APTES) and the material was fully characterized by PXRD, Raman, SEM, FTIR, and TEM. Successful grafting of the amine group over the graphene oxide (GO) surface was confirmed by FT-IR and TEM data. APTES-GO as heterogeneous catalyst demonstrated impressive activity for solvent-free Knoevenagel condensation reaction producing cinnamic acid with excellent conversion (94%) and selectivity (99%) at RT. The catalytic activity remained almost unchanged for four cycles and in fifth cycle conversion was 9% less.
      Graphical abstract image

      PubDate: 2017-01-05T15:24:55Z
       
 
 
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