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  Subjects -> ENGINEERING (Total: 2284 journals)
    - CHEMICAL ENGINEERING (192 journals)
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    - ENGINEERING (1208 journals)
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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: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
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Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
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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  
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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)
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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)
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Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
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Arid Zone Journal of Engineering, Technology and Environment     Open Access  
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: 3)
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: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
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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: 4)
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: 179)
Composites Part B : Engineering     Hybrid Journal   (Followers: 228)
Composites Science and Technology     Hybrid Journal   (Followers: 193)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
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Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
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Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 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 Letters
  [SJR: 0.777]   [H-I: 94]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-879X - ISSN (Online) 1011-372X
   Published by Springer-Verlag Homepage  [2355 journals]
  • Photocatalytic Oxidation of Gaseous Toluene by Visible-Light-Driven
           CoCuMnO x : Performance and Mechanism
    • Authors: Longli Bo; Shuai Xie; Hailong Meng; Jiadong Liu; Bo Gao
      Pages: 1623 - 1630
      Abstract: CoCuMnO x as one solar energy absorbing coating was synthesized by a facile co-precipitation approach for photocatalytic oxidation of gaseous toluene under visible light, and characterized by UV–Vis-DRS, BET, SEM, XRD and XPS, respectively. It demonstrated that CoCuMnO x owned photocatalytic activity and 57% of toluene with an initial concentration of 400 mg/m3 was degraded by 1 g CoCuMnO x under 6 h irradiation with a 100 W halogen tungsten lamp. The degradation of toluene was mainly attributed to photolysis and photocatalysis, and the thermal effect of CoCuMnO x had little effect. The degradation efficiency of toluene decreased gradually from 57 to 32% after five consecutive cycles. High active spinels like Cu1.5Mn1.5O4, CuMn2O4, CuCoO2 and Co2MnO4 existed onto the CoCuMnO x surface, which accelerated electron transfer so as to form various free radicals, such as h+, .OH, and ·O2 − etc. Toluene was oxidized evidently by these radicals so that the aromatic ring itself was cleaved to generate alcoholic, aldehydic and acidic intermediates. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2058-9
      Issue No: Vol. 147, No. 7 (2017)
       
  • CuInS 2 /ZnS/TGA Nanocomposite Photocatalysts: Synthesis, Characterization
           and Photocatalytic Activity
    • Authors: Zhengwei Zhang; An Xiao; Kun Yan; Yanhua Liu; Zhengyu Yan; Jianqiu Chen
      Pages: 1631 - 1639
      Abstract: Herein, the CuInS2/ZnS/TGA quantum dots (QDs) were prepared by the oil phase reaction containing thioglycolic acid (TGA) as a functional modification agent under a nitrogen atmosphere. The CuInS2/ZnS/TGA QDs using as the photocatalysts exhibited high photocatalytic activity for the degradation of Rhodamine B (RhB) under ultraviolet irradiation. The photocatalytic conditions were optimized to degrade RhB with superior performances, including the initial RhB and CuInS2/ZnS/TGA QDs concentrations, solution pH values and ultraviolet light intensities. Furthermore, the kinetic equations of photocatalytic reaction and possible photocatalytic degradation mechanism were investigated. The results indicated that it belongs to the typical first order kinetic in accordance with the Langmuir–Hinshelwood mechanism, and the electrons and holes on the surface of the CuInS2/ZnS/TGA microspheres are the main acting forces during the RhB photocatalytic degradation. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2067-8
      Issue No: Vol. 147, No. 7 (2017)
       
  • Highly Selective Hydrogenation of Butyl Sorbate to Butyl cis -hex-3-Enoate
           Using Cp*-Ruthenium (II) Catalyst
    • Authors: Maria Kotova; Eliška Vyskočilová; Libor Červený
      Pages: 1665 - 1672
      Abstract: The Cp*–ruthenium half sandwich complex [Cp*Ru (butyl sorbate)]Tf (Tf = CF3SO 3 − ) was prepared and used as the catalyst for the hydrogenation of butyl sorbate to butyl cis-hex-3-enoate. The stability of the catalyst was increased by the immobilization of the catalyst to the clay material montmorillonite K10 by means of ionic exchange. Prepared material was characterized by XRD, XRF and TGA methods. Hydrogenation of butyl sorbate was carried out in homogeneous and heterogeneous arrangements. The influence of reaction conditions, especially the influence of the solvent type, on the reaction rate and the selectivity was studied. By-products were identified by GC-MS. The optimal conditions for the highest selectivity (up to 98%) were achieved in heterogeneous hydrogenation in methyl tert-butyl ether using the pressure 4 MPa, temperature 50 °C and 5 wt.% of the catalyst related to the butyl sorbate amount. Furthermore, it was demonstrated that the catalyst could be recovered and reused without loss of selectivity. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2084-7
      Issue No: Vol. 147, No. 7 (2017)
       
  • Influence of Zirconium Modified USY on Coupled Hydrogenation and Ring
           Opening of Tetralin Over NiW/USY + Al 2 O 3
    • Authors: Yandan Wang; Penghui Zeng; Hao Li; Qiaoxia Guo; Baojian Shen
      Pages: 1704 - 1713
      Abstract: There is increasing interest in modification USY in hydrotreating catalysts to attain high activity and targeted product selectivity. Zirconium modification on USY (Zr-USY) was designed in this study. Zirconium highly dispersed, and greatly enriched on the surface of USY zeolites. Zirconium modification slightly induced framework dealumination. Introduction of zirconium increased total acid sites of USY zeolites, probably ascribed to Zr4+ polarizing H2O. The corresponding catalysts NiW/Al2O3 + Zr-USY-1 (40.6 wt%) and NiW/Al2O3 + Zr-USY-2 (41.4 wt%) showed higher selective ring opening products yield compared to NiW/Al2O3 + USY (31.7 wt%). The enhanced ring opening products yield may be due to sufficient cooperation between WS2 and acidity. The results provide further insight into USY modification and its role on hydrotreating catalysts. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2075-8
      Issue No: Vol. 147, No. 7 (2017)
       
  • Phosphonate-based Metal Organic Frameworks as Robust Heterogeneous
           Catalysts for TBHP Oxidation of Benzylic Alcohols
    • Authors: Alireza Farrokhi; Maasoumeh Jafarpour; Reihaneh Najafzade
      Pages: 1714 - 1721
      Abstract: The catalytic performance of STA-12 as a highly robust metal–organic framework (MOF) was explored in the oxidation of benzylic alcohols with tert-butyl hydroperoxide (TBHP) in ethyl acetate as a safe solvent. High efficiency and selectivity towards different benzylic alcohols were documented under controlled conditions. The catalyst proved to be reusable and preserved its integrity after many runs with negligible loss of activity. Graphical The catalytic performance of STA-12 metal–organic frameworks was explored in the oxidation of benzylic alcohols with tert-butyl hydroperoxide (TBHP) in ethyl acetate. The catalysts have high efficiency, selectivity and reusability under controlled conditions.
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2077-6
      Issue No: Vol. 147, No. 7 (2017)
       
  • Role of Anionic Polysaccharide (Alginate) on Activity, Stability and
           Recycling Efficiency of Bacterial Endo (1→4) β- d -Glucanase of GH12
           Family
    • Authors: Asad Karim; Muhammad Asif Nawaz; Afsheen Aman; Shah Ali Ul Qader
      Pages: 1792 - 1801
      Abstract: Extracellular partially purified endo (1→4) β-d-glucanase belong to CAZy Family GH12 produced by Bacillus licheniformis KIBGE-IB2 was immobilized within the microenvironment of calcium alginate beads using entrapment technique. Immobilization technology is one of the supporting technique for obtaining purified product with cost effectiveness. The activities of soluble and immobilized endo (1→4) β-d-glucanase were compared using carboxymethyl cellulose (CMC) as a substrate. The results showed that the maximum immobilization of enzyme was achieved when calcium chloride (0.2 M) and sodium alginate (2.0%) were used. The pH optima of soluble and immobilized enzyme remain same, but temperature optima (60 °C) of entrapped enzyme shifted to a higher level (70 °C) as compared to soluble enzyme. The scanning electron microscopy analysis reveals the changes in morphology and size of micro pores on the surface of calcium alginate before and after immobilization. The immobilized enzyme showed its reusability up to five cycles. The stability against various inhibitors was also improved after immobilization. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2074-9
      Issue No: Vol. 147, No. 7 (2017)
       
  • A Computational Study of the Heterogeneous Synthesis of Hydrazine on Co 3
           Mo 3 N
    • Authors: Constantinos D. Zeinalipour-Yazdi; C. Richard A. Catlow
      Pages: 1820 - 1826
      Abstract: Periodic and molecular density functional theory calculations have been applied to elucidate the associative mechanism for hydrazine and ammonia synthesis in the gas phase and hydrazine formation on Co3Mo3N. We find that there are two activation barriers for the associative gas phase mechanism with barriers of 730 and 658 kJ/mol, corresponding to a hydrogenation step from N2 to NNH2 and H2NNH2 to H3NNH3, respectively. The second step of the mechanism is barrierless and an important intermediate, NNH2, can also readily form on Co3Mo3N surfaces via the Eley–Rideal chemisorption of H2 on a pre-adsorbed N2 at nitrogen vacancies. Based on this intermediate a new heterogeneous mechanism for hydrazine synthesis is studied. The highest relative barrier for this heterogeneous catalysed process is 213 kJ/mol for Co3Mo3N containing nitrogen vacancies, clearly pointing towards a low-energy process for the synthesis of hydrazine via a heterogeneous catalysis route. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2080-y
      Issue No: Vol. 147, No. 7 (2017)
       
  • High NO x Reduction Activity of an Ultrathin Zirconia Film Covering a Cu
           Surface: A DFT Study
    • Authors: Hiroaki Koga; Kohei Tada; Akihide Hayashi; Yoshinori Ato; Mitsutaka Okumura
      Pages: 1827 - 1833
      Abstract: NO reduction by CO over a c-ZrO2(110) ultrathin film covering a Cu(110) surface (ZrO2/Cu) has been examined by means of density-functional theory calculations. Spontaneous transfer of electronic charge from Cu to zirconia gives the latter an ability to reduce oxidants. Gaining this excess charge, NO adsorbs and activates on the cationic Zr site of the oxide surface. Thus activated, two NO on adjacent Zr sites can react to form ONNO with an activation energy of 0.39 eV (8.9 kcal/mol), which readily decomposes into N2O and an O adatom. N2O also decomposes into N2 and an O adatom with negligible activation energy of 0.06 eV (1.4 kcal/mol). CO reacts off the O adatoms left on the surface as CO2 with an activation energy of 0.36 eV (8.2 kcal/mol), completing a redox cycle. These results indicate high potentials of oxide-covered metal catalysts (metal@oxide) for NOx abatement. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2086-5
      Issue No: Vol. 147, No. 7 (2017)
       
  • Exploring Pd/Al 2 O 3 Catalysed Redox Isomerisation of Allyl Alcohol as a
           Platform to Create Structural Diversity
    • Authors: Attila Dékány; Enikő Lázár; Bálint Szabó; Viktor Havasi; Gyula Halasi; András Sápi; Ákos Kukovecz; Zoltán Kónya; Kornél Szőri; Gábor London
      Pages: 1834 - 1843
      Abstract: We report our results on exploiting the different reactivities present in the catalytic cycle of the Pd/Al2O3 catalyzed redox isomerization of allyl alcohol. We show that the reactivity of allyl alcohol derived acrolein and enol can be involved in further cascade reactions leading to a diverse set of products. While the oxidation product acrolein can react via Michael and oxa-Michael reactions, the isomerization product enol can be readily involved in aldol condensation processes. Salicylaldehydes, that are able to react on their electrophilic carbonyl and nucleophilic OH-groups with allyl alcohol derived enol and acrolein, respectively, are used to explore conditions where the structure of the product heterocycles can be controlled. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2087-4
      Issue No: Vol. 147, No. 7 (2017)
       
  • Solvothermal Synthesis of p -type Cu 2 ZnSnS 4 -Based Nanocrystals and
           Photocatalytic Properties for Degradation of Methylene Blue
    • Authors: Hao Guan; Honglie Shen; Adil Raza
      Pages: 1844 - 1850
      Abstract: The quaternary copper-based chalcogenide Cu2ZnSnS4 (CZTS), have recently arisen as a low-cost and environment-friendly material for photovoltaics and photocatalysis. In this paper, p-type kesterite Cu2ZnSnS4 (CZTS) nanocrystals were synthesized by solvothermal method. X-ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM) and UV–Vis spectroscopy were used to investigate the structural, morphological and photocatalytic properties of kesterite CZTS nanocrystals. The kesterite CZTS nanocrystals powder were used as a photocatalyst to investigate the degradation rate of methylene blue (MB) under visible-light irradiation. The results show the 62% degradation of methylene blue (MB) within 240 min under visible-light irradiation. Furthermore, Zn was partially doped with Fe, Mn, Co, and Ni. CZTS-based nanocrystals and results reveal that Cu2(Zn0.8Me0.2)SnS4 (Me = Fe, Mn, Co, Ni) could degrade 92, 74, 84 and 89% of MB within 240 min, respectively, indicating promising potential as effective visible-light photocatalysts. Graphical
      PubDate: 2017-07-01
      DOI: 10.1007/s10562-017-2094-5
      Issue No: Vol. 147, No. 7 (2017)
       
  • Surface Organometallic Chemistry: Paving the Way Beyond Well-Defined
           Supported Organometallics and Single-Site Catalysis
    • Authors: Christophe Copéret; Alexey Fedorov; Pavel A. Zhizhko
      Abstract: The molecular approach to single-site and nanoparticle-based heterogeneous catalysts relies on a stringent control over the surface chemistry, enabled by the judicious choice of dehydroxylated supports and tailored organometallic precursors. Aided by the advanced characterization methods, the field of surface organometallic chemistry (SOMC) has provided molecular-level insights into the mechanism and the nature of active sites of various industrial catalysts. The development of SOMC over the last decades yielded supported catalysts outperforming their homogeneous precursors and provided design principles for catalyst development. Applying the rational structure-activity approach of homogeneous catalysis to the surface species leads to further advances of SOMC, including functional materials for sustainable chemistry, energy storage and imaging, to mention just a few. Graphical
      PubDate: 2017-07-08
      DOI: 10.1007/s10562-017-2107-4
       
  • An Experimental and Kinetic Modelling Study for Methane Oxidation over
           Pd-based Catalyst: Inhibition by Water
    • Authors: Nadezda Sadokhina; Farideh Ghasempour; Xavier Auvray; Gudmund Smedler; Ulf Nylén; Marcus Olofsson; Louise Olsson
      Abstract: The water inhibition of methane oxidation over a bimetallic Pt-Pd on CeO2–Al2O3 catalyst was investigated and the experimental data were used to develop a kinetic model, consisting of only three reaction steps. In the model, the water effect was assigned to the adsorption of H2O on surface sites, as well as to the formation and accumulation of surface hydroxyl groups. These two effects were accounted by the model, which could well describe the experimental data obtained under various conditions. Graphical
      PubDate: 2017-07-08
      DOI: 10.1007/s10562-017-2133-2
       
  • n -Butyl Acetate Synthesis in the Presence of Pyridinium-Based Acidic
           Ionic Liquids: Influence of the Anion Nature
    • Authors: Ivaylo Tankov; Magdalena Mitkova; Radoslava Nikolova; Anife Veli; Dicho Stratiev
      Abstract: The catalytic behavior of three Brønsted acidic ionic liquids: pyridinium hydrogen sulfate ([H–Pyr]+[HSO4]−), pyridinium dihydrogen phosphate ([H–Pyr]+[H2PO4]−) and pyridinium nitrate ([H–Pyr]+[NO3]−) in the esterification of acetic acid with n-butanol was compared in the current paper. The alteration in the values of acetic acid conversion and esterification rate were investigated as a function of the process parameters: catalyst nature, catalyst loading, initial molar ratio n-butanol:acetic acid and reaction temperature. The anion variety modified the acidity of the obtained samples and effected their catalytic activity as follows: [H–Pyr]+[NO3]− < [H–Pyr]+[H2PO4]− < [H–Pyr]+[HSO4]−. The increasing of both catalyst loading and reaction temperature led to higher values of acetic acid conversion and esterification rate. The existence of a positive linear relationship between the esterification rate and acetic acid concentration was observed. The increasing of the n-butanol concentration negatively affected the rate of esterification. The acetic acid conversion was improved as the initial molar ratio n-butanol-to-acetic acid was raised. Graphical
      PubDate: 2017-07-06
      DOI: 10.1007/s10562-017-2135-0
       
  • Efficient Synthesis of Organic Carbonates to the Multigram Level from CO 2
           Using a New Chitin-Supported Catalyst
    • Authors: Heriberto Díaz Velázquez; Javier Guzmán Pantoja; Edith Meneses Ruiz; Roberto García de León; Rafael Martínez Palou
      Abstract: A new a chitin-supported KI catalyst system has shown highly efficient activity towards the cycloaddition of CO2 to epoxides. The cooperative effect of this catalyst system is enhanced when a little amount of DBU as additive is added at a KI:DBU weight ratio of 8:2, which enables scaling-up procedures to a multigram level, using a widely available biopolymer such as chitin. Furthermore, the same catalyst composition is able to activate the trans-esterification of propylene carbonate to dimethyl carbonate under smooth reaction conditions using a KI:DBU weight ratio 1:1. Graphical A combination of DBU with a chitin-supported KI catalyst system has shown highly efficient activity towards the cycloaddition of co2 to epoxides. the synergetic effect in this three-component catalyst system is enhanced at a KI:DBU weight ratio of 8:2, which enables scaling-up procedures to a multigram level, using a widely available biopolymer such as chitin. Furthermore, the same catalyst composition is able to activate the trans-esterification of propylene carbonate to dimethyl carbonate under smooth reaction conditions.
      PubDate: 2017-07-06
      DOI: 10.1007/s10562-017-2123-4
       
  • Catalytic Oxidation of Cyclopentene by O 2 over Pd(II)-SBA-15 Complexes
    • Authors: Lumin Yue; Zhenwei Wang; Lele Bao; Wei Fu; Li Xu; Jun Li; Guanzhong Lu
      Abstract: Novel catalysts with Pd(II)-picolinamide complexes anchored into the channels of mesoporous material SBA-15 were prepared for chemical transformation of cyclopentene, and characterized in details. Spectra of 29Si NMR, 13C NMR and XPS revealed the organic ligands were grafted into the SBA-15 and Pd(II) complexes formed. Spacial diversity of the complexes, especially distances from –C=O to N on pyridyl cycles, may influence electronic distribution of conjugated system and further the catalytic activity. With the help of the newly synthesized catalytic materials, a new heterogeneous oxidation system was developed for selective catalytic transformation of cyclopentene to cyclopentanone with molecular oxygen as the sole oxidant. Analytic results of the reaction mixtures indicated that all catalysts exhibited high activity, while the cat.1 and cat.2 with 2-pyridinecarbonyl or 3-pyridinecarbonyl on the ligands gave better yields of cyclopentanone. 96.2% conversion of cyclopentene and 76.3% yied of cyclopentanone were achieved over the catalyst cat.2 under the conditions of 0.7 MPa O2, 323 K and 6 h reaction. In addition, the catalysts were also appealing for easy separation and recyclable property. Graphical A new heterogeneous reaction system was developed for the catalytic oxidation of cyclopentene to cyclopentanone by molecular oxygen over novel catalysts. The synthesized catalysts are comprised of Pd(II)-picolinamide complexes anchored into the channels of SBA-15. The new system was efficient for the mentioned reaction, and the catalysts were reusable.
      PubDate: 2017-07-06
      DOI: 10.1007/s10562-017-2131-4
       
  • Catalytic Activity of Crystallographically Characterized
           Organic–Inorganic Hybrid Containing 1,5-Di-amino-pentane Tetrachloro
           Manganate with Perovskite Type Structure
    • Authors: Paramita Mondal; Seham Kamal Abdel-Aal; Debasis Das; Sk Manirul Islam
      Abstract: Layered 2D organic–inorganic hybrid perovskite (OIHS) of the diammonium series, 1,5 di-aminepentane tetrachloro mangenate ([NH3–(CH2)5–NH3] MnCl4) was prepared by slow evaporation and reducing temperature method and characterized by single crystal X-ray diffraction analysis. Its structure consists of organic cation, [NH3(CH2)5NH3]+2 extended in a zigzag fashion and inorganic anion, [MnCl6]−2 where Mn2+ is coordinated by six Cl− ion in octahedral fashion. The organic and inorganic segments are alternately stacked along c-axis where inorganic layer is extended through corner-shared octahedra sandwiched by the di-aminopentane molecules. The layers (organic and inorganic) were connected to each other through N–H···Cl hydrogen bonds and van-der Waals interaction to build cation–anion–cation cohesion. The hybrid crystal had orthorhombic non-centrosymetric system having I212121 space group with unit cell parameters a = 7.1742(3) Å, b = 7.3817(3) Å, c = 23.9650(10) Å, V = 1269.13 Å3 and Z = 4. The hybrid exhibited excellent catalytic activity towards sulphide and alkene oxidation using aqueous H2O2 as an oxidant. Graphical OIHS of the diammonium series [NH3–(CH2)5–NH3] MnCl4; 1,5 di-aminepentane tetrachloro mangenate were prepared by slow evaporation and temperature decrease method, characterized by single crystal X-ray diffraction. This complex exhibits excellent catalytic activity towards sulphide oxidation and alkene oxidation using aqueous H2O2 as an oxidant.
      PubDate: 2017-07-05
      DOI: 10.1007/s10562-017-2112-7
       
  • Highly Effective Degradation of p -Nitrophenol Over MoS 2 Under Visible
           Light Illumination
    • Authors: Xing Liu; Lanhua Zhao; Hua Lai; Xing Zhang; Zhengji Yi
      Abstract: In recent years, some two-dimensional nanomaterials, such as graphene and molybdenum disulfide, cause extensive interests from scientists due to their excellent performances. In this paper, MoS2 was synthesized by a simple hydrothermal method without any assisted reagents, the MoS2 nanosheets display relatively high photocatalytic activity of p-nitrophenol degradation under visible light illumination (λ > 420 nm). Some experimental reaction conditions were optimized, the highest degradation efficiency of 55.0% is obtained within 120 min at initial 10.0 mg L−1 p-nitrophenol when the MoS2 is prepared at 200 °C for 20 h with the mole ratio of S/Mo = 1/1. A probable mechanism of photo-degradation was discussed. To our knowledge, there are no other reports on MoS2 photocatalytic degradation of phenolic compounds including p-nitrophenol so far. The present report is expected to contribute toward the disposal of highly toxic pollutant under visible light. Graphical
      PubDate: 2017-07-04
      DOI: 10.1007/s10562-017-2113-6
       
  • Nanostructured Titania-Supported Ceria–Samaria Solid Solutions:
           Structural Characterization and CO Oxidation Activity
    • Authors: Perala Venkataswamy; Damma Devaiah; Kuncham Kuntaiah; M. Vithal; Benjaram M. Reddy
      Abstract: In this work, a novel nanostructured TiO2 supported CeO2–Sm2O3 (CS/T) catalyst was prepared by deposition coprecipitation method and then evaluated for CO oxidation. The role of TiO2 support in the CS/T catalyst was studied by comparing its physicochemical and catalytic properties with the unsupported CeO2–Sm2O3 (CS) and CeO2. Under identical conditions, the CS/T catalyst showed better activity with lower light-off temperature (T50 = ~547 K) compared to the CS and CeO2. Characterization results revealed the constructive structural modifications in the CS/T catalyst owing to the strong synergistic effect between the CeO2–Sm2O3 and TiO2 support, which significantly influenced the catalytic performance for CO oxidation. The highly dispersed Ce–O–Sm solid solution over the TiO2 support leads to large specific surface area, more oxygen vacancies and active oxygen species, which are responsible for better activity of CS/T catalyst. Further, the CS/T catalyst exhibits high reusability (up to three runs) and good long-term stability (48 h) without appreciable loss of catalytic activity. Graphical
      PubDate: 2017-07-04
      DOI: 10.1007/s10562-017-2129-y
       
  • Ethanol Synthesis from Syngas Over CuZnX (X = Ti, Si, Al, Mg)
           Catalysts
    • Authors: Li-Ping Cui; Tao Zhou; Na Li; Zhi-Hua Gao; Zhi-Jun Zuo; Wei Huang
      Abstract: The catalytic performance of ethanol synthesis from CO hydrogenation over CuZnX (X = Ti, Si, Al, Mg) catalysts prepared by complete liquid phase method are studied. Among these catalysts, CuZnTi catalyst has the best ethanol selectivity about 46.6%. Characterization results show that the interaction between Cu species and metal oxides is a key factor for ethanol synthesis from syngas, which is in accordance with our previous results. CuZnTi catalyst also has good repetitive performance. Graphical
      PubDate: 2017-07-03
      DOI: 10.1007/s10562-017-2128-z
       
  • Facile Preparation of Bi 24 O 31 Cl 10 Nanosheets for Visible-Light-Driven
           Photocatalytic Degradation of Tetracycline Hydrochloride
    • Authors: Bingxin Yin; Zhenyuan Fang; Bifu Luo; Guangyi Zhang; Weidong Shi
      Abstract: Novel visible-light-driven Bi24O31Cl10 nanosheets were firstly prepared via a facile solvothermal method followed a thermal treatment. The physicochemical properties of as-synthesized sample was characterized by X-ray diffraction, X-rays photoelectron spectroscopy, scanning electronic microscopy, transmission electron microscopy, and UV–Vis spectroscopy. The photocatalytic activity of the photocatalyst was evaluated by degradation of tetracycline hydrochloride (TC-HCl) under visible-light irradiation. Results shown that the Bi24O31Cl10 nanosheets exhibited dramatically enhanced photocatalytic activity towards TC-HCl degradation in comparison with the traditional BiOCl and TiO2 (P25). The nanosheets also displayed excellent photochemical stability for efficient removal of TC-HCl. This work provides a simple approach to fabricate the novel Bi-based nanomaterial and will bring about potential application in treatment of antibiotic pollutant. Graphical
      PubDate: 2017-07-03
      DOI: 10.1007/s10562-017-2115-4
       
 
 
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