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ENGINEERING (1357 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 9)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 8)
ACS Nano     Hybrid Journal   (Followers: 332)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
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: 5)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 9)
Advanced Journal of Graduate Research     Open Access  
Advanced Nonlinear Studies     Hybrid Journal  
Advanced Science     Open Access   (Followers: 8)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 11)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 8)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 16)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 9)
Advances in Engineering Software     Hybrid Journal   (Followers: 29)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 17)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 24)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Nonlinear Analysis     Open Access  
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 17)
Advances in Polymer Science     Hybrid Journal   (Followers: 45)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 52)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 36)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 2)
Al-Nahrain Journal for Engineering Sciences     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 12)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 25)
Anadolu University Journal of Science and Technology A : Applied Sciences and Engineering     Open Access  
Annals of Civil and Environmental Engineering     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of Regional Science     Hybrid Journal   (Followers: 8)
Annals of Science     Hybrid Journal   (Followers: 8)
Antarctic Science     Hybrid Journal   (Followers: 1)
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: 7)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 20)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 9)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 6)
Applied Sciences     Open Access   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 9)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 2)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 2)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Journal of Control     Hybrid Journal  
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  
AURUM : Mühendislik Sistemleri ve Mimarlık Dergisi = Aurum Journal of Engineering Systems and Architecture     Open Access  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autocracy : Jurnal Otomasi, Kendali, dan Aplikasi Industri     Open Access  
Automotive Experiences     Open Access  
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Avances en Ciencias e Ingenierías     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 2)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 2)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
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)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 13)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering     Hybrid Journal   (Followers: 2)
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: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 36)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomicrofluidics     Open Access   (Followers: 5)
BioNanoMaterials     Open Access   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 41)
Bitlis Eren University Journal of Science and Technology     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 15)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers Droit, Sciences & Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 32)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 47)
Carbon Resources Conversion     Open Access   (Followers: 1)
Carpathian Journal of Electronic and Computer Engineering     Open Access  
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 6)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 10)
Catalysis Science and Technology     Hybrid Journal   (Followers: 10)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access  
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)
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
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: 13)
City, Culture and Society     Hybrid Journal   (Followers: 23)
Clay Minerals     Hybrid Journal   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Hybrid Journal   (Followers: 8)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 3)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Color Research & Application     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 15)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Information Science and Management Engineering     Open Access   (Followers: 4)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 29)
Composite Interfaces     Hybrid Journal   (Followers: 8)
Composite Structures     Hybrid Journal   (Followers: 304)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 243)
Composites Part B : Engineering     Hybrid Journal   (Followers: 277)
Composites Science and Technology     Hybrid Journal   (Followers: 212)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)

        1 2 3 4 5 6 7 | Last

Similar Journals
Journal Cover
Catalysis Surveys from Asia
Journal Prestige (SJR): 0.973
Citation Impact (citeScore): 3
Number of Followers: 3  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1574-9266 - ISSN (Online) 1571-1013
Published by Springer-Verlag Homepage  [2351 journals]
  • Preparation and Characterization of Carbon Modified Pd-Cu/Palygorskite for
           Room-Temperature CO Oxidation Under Moisture-Rich Conditions
    • Abstract: Pd–Cu/Palygorskite catalysts were prepared by a deposition precipitation method using palygorskite (PC/Pal) and carbon modified palygorskite (PC/Pal-C) as supports, respectively. Their catalytic activities toward CO oxidation at room temperature and in humid circumstances were investigated. It is found that PC/Pal-C exhibits much higher catalytic activity and stability than PC/Pal for room-temperature CO oxidation under moisture-rich conditions. X-ray photoelectron spectroscopy (XPS) and H2-TPR results indicate that the more active Pd2+ and highly dispersed Cu2Cl(OH)3 species present on the PC/Pal-C, which promotes the higher catalytic activity. The thermogravimetric (TG) and water contact angles (CA) results suggest that the slightly enhanced hydrophobicity of PC/Pal-C could properly restrain the moisture condensation on the catalyst surface, which may account for the excellent catalytic stability. The more surface active species and the proper hydrophobicity may be responsible for the excellent catalytic performance of PC/Pal-C.
      PubDate: 2019-03-06
  • Advances in Catalyst Design for the Conversion of Methane to Aromatics: A
           Critical Review
    • Abstract: The catalytic methane aromatization (CMA) via the non-oxidative approach is increasingly becoming an interesting process for natural gas, shale gas and biogas valorization. However, the design of catalytic materials that could produce very high methane conversion and aromatics selectivity at affordable stability is still difficult. We have carefully documented herein a comprehensive literature survey on the advances in different catalysts designed, characterized and evaluated for the CMA reaction in the recent times. Details on metal-modified zeolite systems including the active sites identification, role of different metals and their loadings, reaction mechanisms and influence of synthetic and catalytic parameters were substantially discussed. The scope was extended to include zeotypes, oxides, un-modified Mo-based compounds and associated catalysts recently evaluated. There are indications that the powdered GaN material is currently been considered as a CMA catalyst. Therefore, relevant studies were carefully surveyed and discussed. In all cases, parameters varied for ensuring conversion and selectivity control were simultaneously highlighted. The paper identified new research paths based on the areas partly explored for further investigations. Graphical
      PubDate: 2019-03-04
  • The Effect of K Salts on SO 2 –SO 3 Conversion and Denitration Behavior
           over V 2 O 5 –WO 3 /TiO 2 Catalysts
    • Abstract: A series of V2O5–WO3/TiO2 catalysts treated by KCl or K2SO4 were prepared using the equal volume impregnation method. The effects of adding these K salts on SO2–SO3 conversion and on denitration behavior over the catalyst were studied, using reactor trials and various characterization methods, including NH3-TPD, H2-TPR, ICP, BET, XRD, SEM, FT-IR and XPS. The results of catalytic activity evaluation tests show that adding K salts decreases the denitration efficiency, while SO2 enhances the activity of the KCl-poisoned catalyst to an extent. The presence of K salts also improves the SO3 formation rate, such that the SO3 formation rate for the K2SO4-poisoned catalyst is as high as 1.53% at 410 °C (compared with 0.60% for the fresh catalyst). The characterization data indicate that K salts aggregate on the catalyst surface, blocking the pores of the catalyst. The reduction ability of the catalyst is decreased slightly and new weakly acidic sites appear. In addition, the concentration of strongly acidic sites declines. SO2 can increase the surface acidity of the catalyst. K salts increase the number of V5+=O bonds and weakly acidic sites, but consume oxygen atoms along with V and W species. Importantly, the strength of the V5+=O bonds, the concentration of surface chemically adsorbed oxygen and the V4+/V5+ ratio all played vital roles in improving the conversion of SO2–SO3 and in enhancing the NO reduction. Graphical
      PubDate: 2019-03-01
  • Dual-Bandgap Effect of Photonic Crystals on TiO 2 Photocatalytic Activity
           in Ultraviolet and Visible Light Regions
    • Abstract: Photonic crystals (PCs) have promising characteristic to raise the light harvest of materials. PCs with one photonic band gap (PBG) were usually used to enhance the light harvest of materials. In this research work, we used PCs with dual PBGs to increase the light harvest. SiO2 PCs with dual PBGs were constructed through depositing a SiO2 PCs layer on another SiO2 PCs layer by vertical deposition method. Then the bi-layer structured SiO2 PCs were composited with nanocrystalline TiO2 film which was sensitized by CdS quantum dots (QDs) (Q-T), to produce photocatalyst for photodegradation of gaseous acetaldehyde. By adjusting the PBGs of the bi-layer SiO2 PCs, namely one PBG matching with the absorption edge of TiO2 and another PBG matching with the absorbing range of CdS QDs, the photocatalytic activity of the composite film under white light irradiation was increased to 2.11 times of that of the control photocatalyst (the Q-T film coated on a disordered porous SiO2 film). When Q-T film was coupled with a monolayer SiO2 PCs, which has single PBG centered at TiO2’s electronic band gap (EBG) of 380 nm, its photocatalytic activity was increased by 1.34 times. When coupled with a monolayer SiO2 PC with the PBG centering at the EBG of CdS QDs (465 nm), the photo-catalytic activity of the Q-T film was increased by 1.54 times. Because the SiO2 PCs with dual-PBGs can simultaneously enhance the light harvest in ultraviolet and visible light region, the Q-T film coupled with dual-PBGs SiO2 PCs showed the highest activity.
      PubDate: 2019-03-01
  • Sustainable Process for the Synthesis of Value-Added Products Using
           Glycerol as a Useful Raw Material
    • Abstract: The growth of the production of biodiesel has led to an overproduction of crude glycerol as a by-product. In order to secure the competitiveness of the biodiesel industry, the utilization of crude glycerol is emerging as a new and challenging research field. This review paper summarizes the glycerol conversion technology published by our laboratory for the production of value-added chemicals, in four categories: (1) glycerol steam reforming for hydrogen production; (2) glycerol hydrogenolysis into 1, 2-propanediol; (3) glycerol dehydration for acrolein production; and (4) glycerolysis of urea for glycerol carbonate production. We consider that the suggested catalysts are desirable candidates for the production of each chemical from glycerol. Further studies of the demonstration of pilot plant and process optimization are needed for commercial applications.
      PubDate: 2019-03-01
  • Efficient Formaldehyde Elimination Over Ag/MnO 2 Nanorods: Influence of
           the Ag Loading
    • Abstract: A series of Ag/MnO2 nanorods with various loading amounts of Ag were fabricated and used for formaldehyde (HCHO) elimination. The obtained catalysts were characterized by means of N2 adsorption–desorption, SEM, TEM, XRD, H2-TPR, O2-TPD and XPS. As the optimal loading amount of Ag was 0.1%, the Ag/MnO2-r exhibited a superior catalytic performance for HCHO oxidation, on which the 100% conversion of HCHO was achieved at 80 °C. It has observed that the remarkable catalytic activity of 0.1% Ag/MnO2-r was mainly due to the better low-temperature reducibility and more abundant surface active oxygen species resulting from the strong metal-support interaction between Ag and MnO2.
      PubDate: 2019-03-01
  • CuO/CeO 2 –MnO 2 Catalyst Prepared by Redox Method for Preferential
           Oxidation of CO in H 2 -Rich Gases
    • Abstract: CuO/CeO2–MnO2 (CuCeMn-4) catalyst was prepared by redox method and was tested in the CO preferential oxidation in H2-rich gases (CO PROX). CuO/CeO2–Mn2O3 (CuCeMn-3) catalyst was prepared and tested for comparison. CuCeMn-4 exhibits higher catalytic activity than CuCeMn-3. The complete CO conversion with CO2 selectivity of 92% can be obtained at 120 °C over CuCeMn-4. The catalysts were characterized by means of N2 adsorption/desorption, XRD, H2-TPR and XPS techniques. The results show that the interaction between MnO2 and CeO2 in catalyst is stronger than Mn2O3 and CeO2, which can promote the mobility of oxygen species from CeO2–MnO2 to active copper species. XPS characterization further revealed that CuCeMn-4 contains richer lattice oxygen, higher amount of Cu+ species and less carbonate species on the surface as compared with CuCeMn-3. All these should be greatly responsible for the high activity of CuCeMn-4 catalyst.
      PubDate: 2019-03-01
  • Hydrodeoxygenation of Vegetable Oils and Fatty Acids over Different Group
           VIII Metal Catalysts for Producing Biofuels
    • Abstract: Energy security and environment protection are two important aspects of sustainable development. Biofuels are renewable and carbon neutral. They are suitable replacement for conventional fossil derived transport fuels. Their use leads to sustainable development. Among several technological options, catalytic hydrodeoxygenation of vegetable oils leading to diesel-range hydrocarbons is the most attractive approach for producing biofuels. The green diesel, thus produced, could be blended with petro–diesel or used as standalone fuel in the conventional diesel engines. Our research group has been active in developing efficient solid catalysts for hydroprocessing of vegetable oils. This account presents some of our efforts using supported group VIII metals and the importance of electronic contact between metal and support on the catalytic activity and hydrodeoxygenation selectivity in hydroprocessing of vegetable oils.
      PubDate: 2019-02-28
  • Catalytic Removal of Benzene at Mild Temperature over Manganese Oxide
    • Abstract: Series of MnOx catalysts were synthesized through oxalate route and calcined at facile temperatures. Characterizations through XRD, N2-adsorption/desorption, HRTEM, C6H6-TPD, O2-TPD, XPS, and H2-TPR revealed that MnOx calcined at 250 °C (N250) with a main crystal phase of Mn2O3 showed micro-mesopores and largest specific surface area, and therefore had a high adsorption capacity of C6H6. N250 also presented better oxygen mobility, rich surface adsorbed oxygen species (Oads), and proper ratio of surface Mn4+/Mn3+. The starting temperature of H2-TPR of N250 was the lowest among the obtained MnOx samples. As a result, N250 exhibited the lowest T90 value of 191 °C in C6H6 thermal catalytic oxidation (WHSV 60,000 mL gcat.−1 h−1, initial C6H6 concentration 190 ppm) among all the catalysts, and this T90 value is lower than those reported in many research. At last, a potential reaction pathway was proposed according to the results of in-situ FTIR measurement.
      PubDate: 2019-02-19
  • The Titanium–Aluminum Binary Oxide Immobilized over Long-Axis SBA-15 as
           Efficient and Benign Catalyst for Conversion of Sucrose into
    • Abstract: The 5-hydroxymethylfurfural (HMF) is a versatile platform molecule that could be transformed into many fine chemicals. This compound is usually obtained by dehydration of fructose or glucose, but use of sucrose as substrate often demands high temperature and shows poor yield, deserving optimization. In this work, a series of titanium–aluminum binary oxides are prepared over long-axis SBA-15 through co-precipitation of metal salts, and metal ratio of solid product could be controlled by changing metal content of preparative solution. Catalysis reveals solvent, temperature, UV irradiation, and surface composition of catalyst show important influences on output, while catalyst having equimolar titanium and aluminum shows the most promising activity. Additionally, a catalytic mechanism is proposed based on catalyst characterization, catalytic results and calculations. This work would contribute to the synthesis of new oxide catalyst, as well as to utilization of biomass.
      PubDate: 2019-02-19
  • Effects of Cu and Fe Additives on Low-Temperature Catalytic Steam
           Reforming of Toluene Over Ni/AC Catalysts
    • Abstract: Steam reforming of toluene, a model tar compound, was carried out at low temperature of 600 °C using Cu–Ni and Fe–Ni bimetallic catalysts with different molar ratios supported on activated carbon (AC). For the Cu–Ni/AC catalysts, the carbon conversion of toluene rose and then decreased with the content of Cu increasing, and the best performance was achieved at the molar ratio of 0.2. However, the Fe–Ni/AC catalyst with the optimum composition of Fe/Ni = 0.1 had a better catalytic performance for toluene steam reforming than the Cu–Ni/AC catalyst (Cu/Ni = 0.2). During the duration test of 20 h, the Fe–Ni/AC (Fe/Ni = 0.1) catalyst showed higher activity for the average carbon conversion of toluene (93.8% vs. 92.9%) and better resistance. to carbon deposition than those of Ni/AC catalyst. Moreover, the metal average sizes of the spent Ni/AC and 0.1-Fe–Ni/AC were estimated to be 30.0 nm and 19.0 nm, respectively. Based on a variety of physiochemical characterization results, it is demonstrated that the addition of iron into Ni/AC catalyst led to good dispersion of Ni, and few coke formation and limited aggregation of nickel particles during reaction.
      PubDate: 2019-01-02
  • Moderate Temperature Control for a Catalyst Bed with Unique Structure
           Packing in Gas-Phase Propene Oxidation
    • Abstract: Decreasing the maximum temperature and dispersing the high-temperature zone in a catalyst bed can inhibit the generation of local high-temperature zones (hot spot, denoted as HTS) and resolve unbalanced reaction load on a catalyst in vapor-phase oxidation over a fixed-bed tubular reactor. Towards this, the catalyst volume in the high-temperature zone could be decreased and reactant gases could be fed to the volume-decreased catalyst evenly by the optimum feed amount. For our specific strategy, we conceived a type of structure packing with a decreased volume or cross-sectional area and a flow path through which a reactant gas passes and wherein the cross-sectional area decreases continuously or stepwise from the inlet to the outlet. Upon installing any of four types of structure packing, remarkable effects on HTS restriction and the expansion of a moderate-temperature zone were observed in gas-phase propene oxidation. The temperature distribution, maximum temperature in the catalyst bed, and propene conversion were significantly affected by the size and shape of the structure packing. These results indicated that a reactor tube with a longer diameter compared to those of conventional ones may be used, and this would make it possible to reduce pressure loss, facilitate catalyst loading, increase the catalyst loading amount, and improve productivity.
      PubDate: 2018-12-01
  • Conversion of Ethanol and Acetaldehyde to 1, 3-Butadiene Catalyzed by
           Zr–Si Materials
    • Abstract: Series of ZrO2 supported on the different kinds of SiO2 carriers were applied in the reaction of 1, 3-butadiene formation from ethanol and acetaldehyde. ZrO2/Nano-SiO2 performed the best performance with the 1, 3-butadiene selectivity 91.43% and the total conversation 52.39%. Prepared catalysts were characterized by N2 adsorption–desorption, TEM, XRD, temperature-programmed desorption of NH3 and CO2, FTIR spectroscopy of adsorbed pyridine and CO2, Raman XPS. The results show that the weak Lewis acid and basic sites are appropriate for BD formation. Furthermore, more and balance acid-basic sites are rather important for the reaction of ethanol and acetaldehyde conversion to BD.
      PubDate: 2018-12-01
  • Effect of Ni Addition on the Low Temperature Carbon Monoxide Oxidation
           over Au/HAP Nanocatalyst
    • Abstract: Supported gold catalysts with their uniquely catalytic properties have found extensive applications. A challenge for gold catalyst research is now to prevent the sintering of gold particles at high temperature maintaining their high activities simultaneously. Herein, Au/Ni–HAP catalyst with high activity and sintering-resistance was prepared by a deposition–precipitation method. Samples were characterized by XRD, TEM, SEM, UV–Vis, ICP, XPS, FT-Raman and O2-TPD, and their catalytic performance for CO oxidation was tested. TEM results indicated that Au/Ni–HAP catalyst had the smaller gold nanoparticles than Au/HAP catalyst. In UV–Vis spectra, the addition of Ni to Au/HAP catalyst gave rise to larger absorption into visible light, changing the electronic structure of Au/HAP catalyst. Based on XPS studies, nickel existed mainly as NiO in Au/Ni–HAP catalyst, and a small amount of Ni(OH)2 also was formed in Au/Ni–HAP catalyst. Profiles of O2-TPD revealed that Au/Ni–HAP catalyst performed bigger adsorption of oxygen and possessed more new oxygen adsorption sites compared with Au/HAP catalyst. Results showed that Au/Ni–HAP catalyst had better catalytic activity and sintering-resistance than Au/HAP catalyst. The enhanced activity could be attributed to the synergistic effect of gold, nickel and HAP in Au/Ni–HAP catalyst, which created plenty of oxygen vacancies and changed the electronic structure of Au/HAP catalyst.
      PubDate: 2018-12-01
  • Fe/Beta@Meso-CeO 2 Nanostructure Core–Shell Catalyst: Remarkable
           Enhancement of Potassium Poisoning Resistance
    • Abstract: Fe/Beta@meso-CeO2 core–shell catalyst with abundant mesopores was designed and controllablly constructed by a template-assisted self-assembly method. This catalyst was fabricated by small-grain Beta molecular sieve supporting FeOx nanoparticles as the core and thin meso-CeO2 film (~ 2 nm) as the shell, and it exhibits remarkable resistance to potassium poisoning and superior SO2 tolerance for selective catalytic reduction (SCR) of NOx with NH3. Meso-CeO2 shells play a key role in influencing the acidity and redox properties of catalyst. It can not only serve as an effective protective “layer” to prevent K from exchanging the isolated iron ions to form oligonuclear FexOy clusters, but also increase chemisorbed oxygen species and promote the formation of active NO2 and cis-N2O2− species. Moreover, meso-CeO2 thin film can suppress the generation of sulfate species blocking the active sites over Fe/Beta@meso-CeO2 catalyst. Furthermore, the kinetics result further reveals that the coating of meso-CeO2 shell doesn’t change Ea for the SCR reaction, and the decreased kinetic rate for K-poisoning catalyst is caused by the decreased number of active sites for the reaction. Therefore, the present study provides a new path for synthesis and application of core–shell structural catalysts.
      PubDate: 2018-12-01
  • Computational investigation of M 1 /W 6 S 8 (M = Fe, Ru, and Os)
           single-atom catalysts for CO 2 hydrogenation
    • Abstract: CO2 hydrogenation to produce useful chemicals (such as CO, CH4, CH3OH, C2H4 and C2H6) plays a pivotal role in future energy conversion and storage, in which catalysts lie at the heart. We first performed density functional theory calculations to investigate the mechanism for the CO2 hydrogenation to CO through the reverse water–gas shift (RWGS) reaction over M1/W6S8 (M = Fe, Ru, and Os) single-atom catalysts (SACs). The results showed that mechanism C (formic acid mechanism) on the Fe1/W6S8 single-atom catalyst is the most suitable pathway for RWGS with 30.1 kcal/mol rate-determining energy barrier. Additionally, on the basis of the energetic span model (ESM) and d-band center position, it is demonstrated that Fe1/W6S8 is effective catalysts for the reaction. Afterward, we chose the most higher catalytic activity catalysts Fe1/W6S8 for CO hydrogenation to CH4·CH3OH, C2H4 and C2H6. CH4* is formed via CO* → COH* → HCOH* → CH* → CH2* → CH3* → CH4*, the effective barrier for CH4* formation is 24.8 kcal/mol. CH3OH* is formed via CO* → COH* → HCOH* → H2COH* → CH3OH*, the effective barrier for CH3OH* formation is 26.0 kcal/mol. On Fe1/W6S8, the CH* species is the most favorable monomeric CHx* species for production of C2H4 and C2H6, whose formation goes through a path of CO* → COH* → HCOH* → CH*. Once CH* is produced, it will be more selective to C2H4 via C–C coupling of CH*, rather than its hydrogenation to CH4 due to the higher hydrogenation barrier of CH2 species relative to the barriers for CH* + CH* coupling and subsequent conversion to C2H4. Ultimately, C2H6 can be produced from further hydrogenation of C2H4 with moderate barriers. The present insights are helpful for the design and optimization of highly efficient Fe1/W6S8 SACs used in C2H4 and C2H6 formation from CO2 hydrogenation.
      PubDate: 2018-12-01
  • MnO x –CeO 2 mixed oxides for diesel soot oxidation: a review
    • Abstract: Catalytic diesel particulate filter is an efficient equipment for particulate matters control downstream of a diesel engine. MnOx–CeO2 mixed oxides are a potential alternative of the high cost commercial platinum catalyst. However, the poor thermal stability and sulfur resistance are two issues challenging its application. Additionally, the mechanism of synergistic effect between manganese oxide and ceria still remained debatable. Here, the catalysis mechanisms in the presence/absence of NOx were reviewed. The origins of synergistic effects were discussed based on whether the solid solutions formed or not. Meanwhile, different kinds of metal modifications were summarized and their promotion influences on the thermal stability and sulfur resistance were clarified in detail. Graphical
      PubDate: 2018-12-01
  • Research Progresses in the Preparation of Co-based Catalyst Derived from
           Co-MOFs and Application in the Catalytic Oxidation Reaction
    • Abstract: Co-based metal organic frameworks (Co-MOFs) are porous crystalline materials formed by the coupling of metallic cobalt ions and organic ligands. Co3O4 based catalysts derived from Co-MOFs have attracted great attention in the field of catalysis. In this paper, some familiar Co-MOFs materials and the latest progress are introduced, such as ZIF-67, Co-MOF-71 and Co-MOF-74. The preparation techniques of these Co-MOFs are described in detail, including co-precipitation, sol–gel method, dipping method, hydrothermal method, solid phase grinding method, self-assembled template method and so on. The research progress of its application in the field of catalytic oxidation reaction is also highlighted. Based on the report of published literatures, we analyzed the design ideas of Co-MOFs materials and put forward the prospect for the future development.
      PubDate: 2018-11-19
  • Preparation and Photocatalytic Activity of Ag 2 S/ZnS Core–Shell
    • Abstract: Ag2S/ZnS core–shell composite microspheres were successfully synthesized via a simple two-step hydrothermal process, in which Ag+ ions might replace Zn2+ ions on the surface of ZnS microspheres via an ion exchange, and subsequently form Ag2S nucleus on the surface of the microspheres. The effect of Ag2S content on the structure, morphology and optical properties of the material was studied in detail. We found that the photocatalytic efficiency of Ag2S/ZnS composites for the degradation of Rhodamine B (RhB) aqueous solution is much higher than that of pure ZnS or Ag2S under solar-simulated light irradiation, which is considered that the combination of a narrow band gap with a wide band gap semiconductor can timely transfer photogenerated electron–hole pairs and rapidly separate photogenerated electrons and holes. Moreover, the catalytic activities of the 4%Ag2S/ZnS sample for oxidation and decomposition of RhB with the assistance of hydrogen peroxide are enhanced with an increase of the degradation efficiency from 68.8 to 90.0% at room temperature.
      PubDate: 2018-09-01
  • Catalytic Hydrogenation of Levulinic Acid into Gamma-Valerolactone Over
           Ni/HZSM-5 Catalysts
    • Authors: Di Zhang; Yun-Peng Zhao; Xing Fan; Zhong-Qiu Liu; Rui-Yu Wang; Xian-Yong Wei
      Abstract: A series of Ni/HZSM-5 catalysts with different Ni-loadings and Si/Al ratios were prepared by incipient wetness impregnation and employed for catalytic hydrogenation of levulinic acid (LA) to gamma-valerolactone (GVL). Their physicochemical properties were characterized by X-ray diffraction, nitrogen adsorption–desorption, X-ray photoelectron spectrometer, temperature-programmed desorption of ammonia,transmission electron microscopy, temperature-programmed reduction of hydrogen, and pyridine-adsorbed infrared spectroscopy. The diffraction peaks assigned to Ni phase were not observed, implying that nickel particles were small and had a high dispersion on the supports. The catalysts with a strong acidity and the appropriate ratio of Brönsted (B) acid sites to Lewis (L) acid sites (B/L = 4.9) show an excellent activity and selectivity for the hydrogenation of LA to GVL. High conversion of LA and selectivity towards GVL were achieved over 5 wt% Ni/HZSM-5-50. The maximum GVL yield of 100% over 5 wt% Ni/HZSM-5-50 was obtained under the optimized reaction conditions of 210 °C, 2 h, and 3 MPa initial hydrogen pressure.
      PubDate: 2018-05-22
      DOI: 10.1007/s10563-018-9246-5
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