Subjects -> ENGINEERING (Total: 2844 journals)
    - CHEMICAL ENGINEERING (259 journals)
    - CIVIL ENGINEERING (255 journals)
    - ELECTRICAL ENGINEERING (182 journals)
    - ENGINEERING (1420 journals)
    - ENGINEERING MECHANICS AND MATERIALS (454 journals)
    - HYDRAULIC ENGINEERING (60 journals)
    - INDUSTRIAL ENGINEERING (101 journals)
    - MECHANICAL ENGINEERING (113 journals)

ENGINEERING (1420 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 9)
3D Research     Hybrid Journal   (Followers: 22)
AAPG Bulletin     Hybrid Journal   (Followers: 11)
Abstract and Applied Analysis     Open Access   (Followers: 4)
Aceh International Journal of Science and Technology     Open Access   (Followers: 9)
ACS Nano     Hybrid Journal   (Followers: 453)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Nova     Open Access   (Followers: 1)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 4)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access   (Followers: 1)
Active and Passive Electronic Components     Open Access   (Followers: 8)
Adaptive Behavior     Hybrid Journal   (Followers: 9)
Adsorption     Hybrid Journal   (Followers: 5)
Advanced Energy and Sustainability Research     Open Access   (Followers: 8)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 14)
Advanced Engineering Research     Open Access  
Advanced Journal of Graduate Research     Open Access   (Followers: 4)
Advanced Quantum Technologies     Hybrid Journal   (Followers: 1)
Advanced Science     Open Access   (Followers: 13)
Advanced Science Focus     Free   (Followers: 7)
Advanced Science Letters     Full-text available via subscription   (Followers: 13)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 11)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 20)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Catalysis     Full-text available via subscription   (Followers: 8)
Advances in Complex Systems     Hybrid Journal   (Followers: 12)
Advances in Engineering Software     Hybrid Journal   (Followers: 31)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 20)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 22)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 30)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 27)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 10)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 36)
Advances in Operations Research     Open Access   (Followers: 14)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 21)
Advances in Polymer Science     Hybrid Journal   (Followers: 54)
Advances in Porous Media     Full-text available via subscription   (Followers: 6)
Advances in Remote Sensing     Open Access   (Followers: 59)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aerobiologia     Hybrid Journal   (Followers: 4)
Aerospace Systems     Hybrid Journal   (Followers: 10)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 8)
AIChE Journal     Hybrid Journal   (Followers: 38)
Ain Shams Engineering Journal     Open Access   (Followers: 7)
Al-Nahrain Journal for Engineering Sciences     Open Access  
Al-Qadisiya Journal for Engineering Sciences     Open Access   (Followers: 2)
AL-Rafdain Engineering Journal     Open Access   (Followers: 3)
Alexandria Engineering Journal     Open Access   (Followers: 3)
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: 12)
American Journal of Engineering Education     Open Access   (Followers: 20)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 31)
Annals of Civil and Environmental Engineering     Open Access   (Followers: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 6)
Annals of Regional Science     Hybrid Journal   (Followers: 10)
Annals of Science     Hybrid Journal   (Followers: 10)
Annual Journal of Technical University of Varna     Open Access   (Followers: 1)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 2)
Applications in Energy and Combustion Science     Open Access   (Followers: 4)
Applications in Engineering Science     Open Access   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 8)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 22)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Engineering Letters     Open Access   (Followers: 5)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 11)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 6)
Applied Physics Research     Open Access   (Followers: 7)
Applied Sciences     Open Access   (Followers: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6)
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 Thermodynamics     Open Access   (Followers: 13)
Arctic     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access   (Followers: 1)
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: 7)
Assembly Automation     Hybrid Journal   (Followers: 2)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
AURUM : Mühendislik Sistemleri ve Mimarlık Dergisi = Aurum Journal of Engineering Systems and Architecture     Open Access   (Followers: 1)
Australasian Journal of Engineering Education     Hybrid Journal   (Followers: 3)
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Hybrid Journal   (Followers: 2)
Autocracy : Jurnal Otomasi, Kendali, dan Aplikasi Industri     Open Access  
Automotive and Engine Technology     Hybrid Journal  
Automotive Experiences     Open Access  
Automotive Innovation     Hybrid Journal   (Followers: 1)
Avances en Ciencias e Ingenierías     Open Access  
Avances: Investigación en Ingeniería     Open Access   (Followers: 6)
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: 6)
Batteries     Open Access   (Followers: 11)
Batteries & Supercaps     Hybrid Journal   (Followers: 7)
Bautechnik     Hybrid Journal   (Followers: 3)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 29)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (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   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 14)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 14)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 6)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 6)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 8)
Biomicrofluidics     Open Access   (Followers: 7)
Biotechnology Progress     Hybrid Journal   (Followers: 44)
Black Sea Journal of Engineering and Science     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)
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   (Followers: 1)
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 30)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 50)
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: 8)
Catalysis Communications     Hybrid Journal   (Followers: 7)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 13)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysis Today     Hybrid Journal   (Followers: 8)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
Cell Reports Physical Science     Open Access  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 2)
Central European Journal of Engineering     Hybrid Journal  
CFD Letters     Open Access   (Followers: 8)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 3)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Journal of Population, Resources and Environment     Open Access  
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: 2)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Hybrid Journal   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Hybrid Journal   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 27)
Clay Minerals     Hybrid Journal   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 14)
Coastal Engineering Journal     Hybrid Journal   (Followers: 9)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 2)
Coastal Management     Hybrid Journal   (Followers: 30)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 3)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Color Research & Application     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 21)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 10)
Composite Structures     Hybrid Journal   (Followers: 335)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 279)
Composites Part B : Engineering     Hybrid Journal   (Followers: 312)
Composites Part C : Open Access     Open Access   (Followers: 3)
Composites Science and Technology     Hybrid Journal   (Followers: 247)
Comptes Rendus : Mécanique     Open Access   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 20)
Computational Optimization and Applications     Hybrid Journal   (Followers: 11)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 21)

        1 2 3 4 5 6 7 8 | Last

Similar Journals
Journal Cover
Catalysis Letters
Journal Prestige (SJR): 0.73
Citation Impact (citeScore): 2
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-879X - ISSN (Online) 1011-372X
Published by Springer-Verlag Homepage  [2658 journals]
  • 2D Vanadium Carbide (MXene) for Electrochemical Synthesis of Ammonia Under
           Ambient Conditions

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      Abstract: Two-dimensional (2D) materials are used in energy storage and conversion due to their unique electronic structure and large specific area. In this work, 2D vanadium carbide (V2CTx MXene) is fabricated and studied as an efficient and earth-abundant electrocatalyst for electrocatalytic N2 reduction reaction (NRR). When tested in 0.1 M Na2SO4, such electrocatalyst achieves a large NH3 yield rate of 12.6 μg h–1 mg–1cat. and a Faradaic efficiency of 4% at –0.7 V vs. reversible hydrogen electrode. Theoretical calculations show a low reaction barrier of 0.88 eV in the distal route for this catalyst. Graphic
      PubDate: 2021-12-01
       
  • Surface Engineering of CeO2 Catalysts: Differences Between Solid Solution
           Based and Interfacially Designed Ce1−xMxO2 and MO/CeO2 (M = Zn, Mn)
           in CO2 Hydrogenation Reaction

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      Abstract: Zn- and Mn-doped Cerium-oxide based catalyst textured as a solid solutional as well as interfacial form was compared in CO2 hydrogenation reaction to understand the role of texture as well as dopant type. Ce0.9M0.1O2 (M = Zn, Mn) solid solution was prepared by hydrothermal method and CeO2 supported 10 mol% metal oxide (Metal = Zn, Mn) were prepared by wet impregnation method, where the catalysts were characterized by XRD, N2 adsorption/desorption isotherm, TEM, Raman spectra, HAADF-STEM and H2-TPR. During the CO2 activation reaction, CO was the major product with minor amounts of methane, ethane, methanol and ethanol. In the case of the Zn-doped CeO2 catalyst, the presence of Zn improved catalytic activity in both solid solutional and interfacial form due to the synergetic effect of Zn-Ce-based oxide. However, for MnOx/CeO2 catalysts, the CO2 consumption rate significantly decreased for 10 mol% MnOx/CeO2, Ce0.9Mn0.1O2 and Mn3O4, where the MnOx addition inhibits the reduction of CeO2. In the case of the pure CeO2, DRIFTS spectra show that formate intermediate formed by reaction between activated CO2 and OH transformed into methoxy species through formaldehyde intermediates, which leads to the formation of small amount of methanol and ethanol. Graphic
      PubDate: 2021-12-01
       
  • Nanoscale Zero-Valent Iron Supported on Carbon Nitride as a
           Peroxymonosulfate Activator for the Efficient Degradation of Paraxylene

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      Abstract: Nanoscale zero-valent iron (nZVI) supported on polymeric graphitic carbon nitride (CN) composite (nZVI@CN) was synthesized via liquid phase reduction method as peroxymonosulfate (PMS) activator, and had been achieved efficient degradation of paraxylene (PX) in this study. The physicochemical properties of nZVI@CN were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, Scanning electron microscopy and Brunauer–Emmett–Teller. The results indicated that catalyst prepared with 1:1 of nZVI and CN mass ration showed the best catalytic performance for the PX degradation. The removal efficiency of PX was 90.9% within 30 min treatment with the optimal reaction conditions (1 mM PMS, 0.1 g/L nZVI@CN, 20 mg/L PX and pH 6.86), and the mineralization rate measured by the removal of total organic carbon had reached 82.6%. Radical quenching and Electron paramagnetic resonance detection confirmed that sulfate and hydroxyl radicals generated by PMS activation were responsible for the degradation of PX, and sulfate radicals were the dominant active species. In addition, the possible reaction mechanism was proposed based on the experimental results. The nZVI@CN can not only be suitable for wide pH range (3–9) to effectively remove PX, but also has good stability and reusability. The removal efficiency of PX was higher than 60% in the fifth reuse experiment, which indicated that nZVI@CN was a stable PMS activator for efficiently PX removal in water. Graphic
      PubDate: 2021-12-01
       
  • Promoted Hydroformylation of Formaldehyde By Electronic Metal–Support
           Interactions in N-Group Functionalized Silica Supported Rhodium Catalyst

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      Abstract: The influence of surface modification of SiO2 carrier by grafting method and its effects for Rh supporting was investigated on formaldehyde hydroformylation reaction. The relationship between the structure of catalysts and their performance was characterized in detail by X-ray diffraction, N2 adsorption–desorption, temperature programmed reduction with H2, X-ray photoelectron spectroscopy, and in situ infrared. After grafting the amino organic functional group, the surface circumstance of SiO2 was altered, and moreover, sites available for metal loading was enriched on the carrier that distribute a high dispersion of Rh species Under the same Rh loading, the Rh@N–SiO2 catalyst exhibits better catalytic activity than pristine SiO2 supported Rh catalysts. Spectroscopic evidences suggest the presence of an electronic perturbation between Rh and modified SiO2 which promotes the hydroformylation of formaldehyde by maintaining Rh at proper Rh0/(Rh3+ + Rhδ+) ratio. Graphic Diagram of the effect of surface modified with amino group on metal rhodium loading.
      PubDate: 2021-12-01
       
  • Optimization of Lipase Production by Response Surface Methodology and Its
           Application for Efficient Biodegradation of Polyester vylon-200

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      Abstract: Lipase-mediated polymer degradation is a robust alternative approach to conventional methods due to biocompatibility and mild conditions. In the present study, response surface methodology was applied to improve the production of lipase from Penicillium fellutanum by optimization of various process parameters. Under the optimized bioprocess conditions of pH 5.0, incubation time 24 h, temperature 35 °C, and lactose as an additional carbon source in 40 experimental runs, the maximum lipase titer of 1038.86 U/gds was achieved, 2.05-fold higher than the lipase yield in basal medium. All the linear and interactive coefficients (except linear carbon source) were found significant by analysis of variance. The as-synthesized cell-free lipase extract was partially purified by ammonium sulfate fractionation and dialysis (2.06-folds, 272.37 U/mg proteins) and applied to the degradation of polyester vylon 200. The biocatalytic action of the enzyme results in an 81% weight loss of PV-200 after 7 days of incubation at pH 7.5 and 35 °C. Different characterization techniques, i.e., SEM, FT-IR, and DSC corroborated the lipase-catalyzed degradation of PV-200. The untreated polyester film had a smooth surface, while after enzymatic treatment, deformities and various micron-sized holes and cracks appeared on the film surface. In conclusion, the outcomes of study display a high potential of lipase as green and ecofriendly biocatalyst for efficient degradation and depolymerization of polyester for environmental safety. Graphic
      PubDate: 2021-12-01
       
  • Boosting the Catalytic Performance by Confining Rich Carbon Atoms over
           Graphite Carbon Nitride Structure

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      Abstract: In this study, the porous ultrathin graphitic carbon nitride (CN) nanosheets with rich C and nitrogen defects were prepared by one-step calcining the mixture of melamine and glucose (Glu) in air atmosphere (Glu-CN). Introducing simultaneously rich C atoms and nitrogen defects into CN structures continuously modulates the bandgaps from 2.67 to 1.81 eV of CN photocatalysts. Due to large surface area, more active sites, remarkably longer lifetime of charge carriers and adjustable band gap structure, the prepared ultrathin porous CN nanosheets show the enhanced photocatalytic performance for the degradation of methyl orange (MO) under visible light. The degradation efficiency of optimal CN nanosheet photocatalyst for MO is 5.75 times that of bulk CN. This work provides a facile and universal relevance approach to engineer the band structures of CN by introduction of rich C and porous morphology for high-performance photocatalytic, which can provide informative principles for the design of efficient photocatalysis systems for solar energy conversion. Graphic
      PubDate: 2021-12-01
       
  • Au/Pt Bimetallic Nanoparticle Decorated Microparticle Hybrid Catalyst
           System for Heterogeneous Hydrogenation of Styrene

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      Abstract: Poly(methacryloyloxy quinoline) microparticles were synthesized and used as reducing and stabilizing agents to prepare Au/Pt bimetallic nanoparticle (NP) decorated microparticle (MP) hybrid catalyst systems. These newly reported hybrid catalyst systems were used for reduction of styrene into ethylbenzene. Gold precursor was essential to prepare bimetallic NPs due to its great interaction with PMAQ resulting in the reduction to AuNPs on the surface of PMAQ MPs. Pt is also contrubute to NP formation thanks to this superior interaction between Au and PMAQ MPs. The bimetallic nanoparticle contents on the PMAQ MPs were determined as Au0.85Pt0.15 via XRD analysis. Au and Pt amounts were also determined with ICP-MS analysis. Although the metal amount in the sample was quite low, the catalytic effect was remarkable for hybrid system. AuNP decorated MPs had no catalytic activity for the reduction of styrene. Thus, it is clear that Pt was the active part of hybrid catalyst system for this reaction. On the other hand, gold precursor had been determined as crucial for the simultaneous synthesis of bimetallic NP decorated MPs as well. Graphic New microparticles decorated with bimetallic nanoparticles have been synthesized and used effectively as a catalyst systems in the hydrogenation of styrene. While it is reported in the literature that such particles have successful catalytic activity in various oxidations, our particles stand out with reducing activities, reusabilities and easy production/removal properties.
      PubDate: 2021-12-01
       
  • Application of Urchin-Alumina as Catalyst Support in Hydrodesulfuization
           of Siberian (Ruassia) Crude Oil

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      Abstract: The catalyst pore structure is important to accommodate deposits in the hydrotreatment processes. In the current study, urchin alumina with large pore mouths was successfully synthesized by template free method, and was used as catalyst support for the hydrodesulfurization (HDS) of Siberian crude oil. Commercial alumina was used as reference. The catalysts were characterized by XRD, N2 physisorption, TPR, NH3-TPD, SEM, and was evaluated in a trickle-bed reactor. The urchin alumina exhibits smaller surface area and larger average pore diameter than the commercial alumina. NiMo/ur-Al2O3 shows similar activity and better stability within the long-term HDS run of 100 h. After the HDS test, the weight loss of coke over NiMo/ur-Al2O3 is about half of that over NiMo/com-Al2O3; however, the urchin morphology of NiMo/ur-Al2O3 is not retained due to the high pressure during the reaction. The better performance in carbon resistance is consistent with the “chestnut bur” catalyst reported by IFP; this work supplements the synthesis detail and characterizations for the urchin-alumina supported catalyst, and provides important information for industrial hydrotreatment catalyst development. Graphic abstract
      PubDate: 2021-12-01
       
  • Comparison of n-Dodecane Hydroisomerization Performance Over Pt Supported
           ZSM-48 and ZSM-22

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      Abstract: ZSM-48 and ZSM-22 zeolites with similar Si/Al ratio were synthesized and modified by alkali treatment. Moreover, n-dodecane hydroisomerization performance of Pt supported ZSM-22 and ZSM-48 were investigated. The catalytic results showed that the activity and the isomers selectivity of n-dodecane hydroisomerization could be improved by alkali treatment. The isomers distributions were distinct for Pt/ZSM-48 and Pt/ZSM-22. Mono-branched isomers near the end of the chains were more prone to be generated on Pt/ZSM-22 catalyst, which suggested “pore-mouth” catalysis model dominating the hydroisomerization catalysis. However, di-branched isomers and mono-branched isomers with methyl near the middle of the carbon chains were favorable to be formed over Pt/ZSM-48 catalyst according to the “key-lock” catalysis model. Moreover, more central-branched isomers were formed at high reaction temperature (> 320 °C) especially for Pt/ HZSM-22. Graphic
      PubDate: 2021-12-01
       
  • Heterogeneous Catalytic Oxidative Bromination and Oxidation of Thioethers
           By Vanadium(IV) Oxido Complex of Benzoylacetone and Effect of Solid
           Supports

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      Abstract: Vanadium(IV) oxido complex of 1-Phenyl-1,3-butanedione [VIVO(bzac)2] (1) was prepared, characterized, and heterogenized onto APTMS modified graphene oxide, as well as imidazole modified polystyrene beads. Graphene oxide supported complex GO-APTMS-[VIVO(bzac)2] (2) and polymer anchored complex PS-im-[VIVO(bzac)2] (3) were used for the oxidative bromination of a number of small organic molecules and oxidation of a series of thioethers. Both 2 and 3 evolve as excellent heterogeneous catalysts. The nature of solid support does not impact substrate conversion (%) during the oxidative bromination of salicylaldehyde, phenol, or styrene, whereas it influences the substrate conversion (%) as well as the product selectivity (%) during the oxidation of thioethers. Graphic
      PubDate: 2021-12-01
       
  • Calcination Temperature Effect in Catalyst Reactivity for the CO SELOX
           Reaction Using Perovskite-like LaBO3 (B: Mn, Fe, Co, Ni) Oxides

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      Abstract: H2 production by conventional processes such as reforming reactions involves formation of some undesired products such as CO. Selective CO oxidation (SELOX) is a good alternative to reduce its concentration because it is a thermodynamically favorable process. Perovskite-like oxides (LaMO3) are used in this work to catalyze the CO-SELOX process and they were synthetized by the self-combustion method. All catalysts were calcined at different temperatures (400 °C–800 °C) to analyze its impact on the material physicochemical properties. Different analytical techniques were used to study changes in structural and chemical properties. Temperature-programmed reaction (TPRe), using CO oxidation and CO-SELOX, was used to measure the catalytic reactivity of perovskite-like oxides. It was found that catalytic activity decreases when calcination temperature (CT) increases and that is correlated with oxygen mobility, surface defects, and surface concentration of manganese or cobalt species. It is also found that there is a crystalline phase change in the solids when the CT increases from 500 to 600 °C. The high catalytic activity observed at low CT remained even if they were calcined below 600 °C, which implies the possibility of amorphous species having catalytic activity that do not require a well-structured perovskite. Graphic
      PubDate: 2021-12-01
       
  • Hierarchical Layered Porous SiO2 Supported Bimetallic NiM/EXVTM-SiO2
           (M = Co, Cu, Fe) Catalysts Derived from Vermiculite for CO2 Reforming
           of Methane

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      Abstract: In this study, the two-dimensional layered porous silica material (EXVTM-SiO2) was designed and prepared by “expansion-acidification” modified vermiculite. Herein, NiM/EXVTM-SiO2 (M = Co, Cu, Fe) bimetallic catalysts were prepared by the incipient wetness impregnation method. Three kinds of bimetallic catalysts were used in methane reforming. The catalysts were characterized by techniques such as XRF, ICP, XRD, BET, SEM, TEM, XPS, H2-TPR and TG. It was found that NiCu/EXVTM-SiO2 catalyst had high catalytic activity and stability, and the conversion of CO2 was up to 92%, which realized the efficient catalytic conversion of CO2. On the one hand, the reason can be attributed to the fact that the active metal in the NiCu/EXVTM-SiO2 catalyst has a smaller particle diameter (10.6 nm) and a relatively high metal dispersibility. On the other hand, the Ni-Cu alloy has a significant effect on the adsorption and activation of CO2 at high temperature. Graphic NiM/EXVTM-SiO2 (M = Co, Cu, Fe) bimetallic catalysts was obtained by the incipient wetness impregnation method. Due to the synergistic effect between Ni and Cu, NiCu/EXVTM-SiO2 catalyst shows good performance in catalytic methane reforming.
      PubDate: 2021-12-01
       
  • Biodiesel Production Over Esterification Catalyzed by a Novel Poly(Acidic
           Ionic Liquid)s

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      Abstract: High biodiesel yield was obtained by using poly (acidic ionic liquid)s. The ionic liquid monomer was synthesized through quaternary ammonization on the N,N-Dimethyl-3-aminophenol with 1,3-propanesultone and p-Hydroxybenzenesulfonic acid. The IL monomer and formaldehyde was used to synthesize the poly(acidic ionic liquid)s. Several physicochemical techniques were used in the characterization of this poly(acidic ionic liquid)s. The esterification of oleic acid and methanol was used to investigate the catalytic activity of the synthesized catalyst. In order to obtain the maximum yield, four parameters (reaction time, amount of methanol, temperature and catalyst amount) were considered. In the optimum condition (5 wt% catalyst amount, 9:1 methanol/oleic acid ratio at 80 °C for 1.5 h), the ester yield was up to 93.3%. After four cycles of use, the catalytic activity of FCPIL did not exhibit significant decline. Graphic
      PubDate: 2021-12-01
       
  • Efficient Solvent-Free Hydrosilylation of Aldehydes and Ketones Catalyzed
           by Fe2(CO)9/C6H4-o-(NCH2PPh2)2BH

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      Abstract: An efficient solvent-free catalyst system for hydrosilylation of aldehydes and ketones was developed based on iron pre-catalyst Fe2(CO)9/C6H4-o-(NCH2PPh2)2BH. The reactions were tolerant of many functional groups and the corresponding alcohols were isolated in good to excellent yields following basic hydrolysis of the reaction products. The reaction is likely catalyzed by an in situ generated pincer ligated iron hydride complex. Graphic
      PubDate: 2021-12-01
       
  • Agro-Waste Generated Pd/CAP-Ash Catalyzed Ligand-Free Approach for
           Suzuki–Miyaura Coupling Reaction

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      Abstract: We converted agro-waste Custard Apple Peels (CAP) to ash via thermal treatment, on which Pd(OAc)2 was immobilized easily that produced a low-cost, highly efficient Pd/CAP-ash catalyst. The prepared catalyst was fully characterized by using FT-IR, SEM, EDX, XRF, DSC-TGA, BET, HR-TEM, and XPS techniques. The Pd/CAP-ash catalyst was conveniently applied for the Suzuki–Miyaura coupling reaction under external base free and ligand-free conditions in an aqueous-organic solvent to produce biphenyls in good to excellent yields. The main attraction of our protocol an application of palladium-supported agro-waste material which is easily recoverable and recyclable provides mono and bis-coupled derivatives in a short reaction time. Graphic
      PubDate: 2021-12-01
       
  • CO2 Hydrogenation over Ru-NPs Supported Amine-Functionalized SBA-15
           Catalyst: Structure–Reactivity Relationship Study

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      Abstract: We gave an effective protocol to support Ru NPs on amine-functionalized SBA-15 mesoporous silica to catalyze the CO2 hydrogenation reaction. The amine groups present in the catalytic system performed an essential role in stabilizing the Ru NPs, delivering the robust metal-support interaction and improved catalytic activities to material in formic acid synthesis. We also demonstrated a comprehensive study of different amine groups on the catalytic performance of ultrafine uniformly dispersed Ru NPs over mesoporous SBA-15 support. The effect of various compositional and steric properties of amine groups on the size/distribution of the Ru NPs were closely studied and correlated with their catalytic performance in the CO2 hydrogenation reaction. The in situ DRIFTS analysis of CO2 hydrogenation into formic acid in presence of developed CATALYST-1 showed active surface species bonded to support sites and to Ru NPs. This interaction proposed the formation of important intermediates such as hydrides, formates and bicarbonates, which are significant for the formation of formic acid. We successfully recycled the catalysts up to 5 runs with good catalytic activity. Graphic
      PubDate: 2021-12-01
       
  • On the Role and Applications of Electron Magnetic Resonance Techniques in
           Surface Chemistry and Heterogeneous Catalysis

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      Abstract: Some relevant aspects of Electron Paramagnetic Resonance (EPR) applied to the fields of surface chemistry and heterogeneous catalysis are illustrated in this perspective paper that aims to show the potential of these techniques in describing critical features of surface structures and reactivity. Selected examples are employed covering distinct aspects of catalytic science from morphological analysis of surfaces to detailed descriptions of chemical bonding and catalytic sites topology. In conclusions the pros and cons related to the acquisition of EPR instrumentations in an advanced laboratory of surface chemistry and heterogeneous catalysis are briefly considered. Graphic
      PubDate: 2021-12-01
       
  • A Tubular g-C3N4 Based Composite Photocatalyst Combined with Co3O4
           Nanoparticles for Photocatalytic Degradation of Diesel Oil

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      Abstract: The photocatalysis is a very promising technique to address the serious issues of environmental pollution. Among the common photocatalysts, the graphitic carbon nitride (g-C3N4) is widely used for the photodegradation of organic pollutants due to its proper band structure. To further improve the photocatalytic performance of g-C3N4, a novel composite photocatalyst of Co3O4/PT-C3N4 has been prepared by using a one-pot calcination method, in which cobalt tetroxide (Co3O4) nanoparticles as the cocatalyst are introduced on the surface of rectangular hollow g-C3N4 substrate (PT-Co3O4). As a result, the obtained composite photocatalyst (Co3O4/PT-C3N4) delivers an excellent photodegradation performance for diesel oil under a simulated sunlight, which can improve the separation efficiency of the photo-induced electron–hole pairs. The Co3O4/PT-C3N4 composite photocatalyst exhibits a high degradation efficiency of 96.27% after 2 h of visible light, which is much higher than that of the PT-C3N4 photocatalyst. Moreover, the composite photocatalyst can still maintain a high photodegradation efficiency after 10 cycles, exhibiting an excellent cyclic stability. The photo-induced carriers generated by the Co3O4/PT-C3N4 composite photocatalyst follow the Z-scheme heterojunction transfer mechanism. This work gives a fresh idea for the exploration of new high-performance photocatalyst for the treatment of organic environmental pollutants. Graphical
      PubDate: 2021-12-01
       
  • Trifluoroacetic Acid Hydroxylamine System as Organocatalyst Reagent in a
           One-Pot Salt Free Process for the Synthesis of Caprolactam and Amides of
           Industrial Interest

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      Abstract: In this work we studied the reactivity of the Trifluoroacetic acid hydroxylamine system in the one step salt free synthesis of amides from ketones. A particular regards was paid to the caprolactam synthesis because of its industrial relevance. Synthesis, reactivity and characterization of the hydroxylamine trifluoroacetate is given. Fast oximation reaction of several ketones was gained at room temperature (1 h of reaction quantitative conversion for several ketones). In the same reactor, by raising the temperature at 383 K, the Beckmann rearrangement of the so obtained oximes is easily accomplished in the presence of three equivalent of TFA. The possibility of obtaining the trifluoroacetate of the hydroxylamine with a modified nitric acid hydrogenation reactions was verified, too. Reuse of solvent and trifluoroacetic acid is easily achieved by distillation. Graphical abstract Salt free one-pot caprolactam and amides process catalyzed by CF3COOH, in the presence of NH2OH TFA as the oximation agent.
      PubDate: 2021-12-01
       
  • Phosphorus-doped Carbon Nitride Nanosheets as Efficient
           White-LED-Light-Driven Photocatalyst for Hydrogen Evolution and
           Tetracycline Degradation

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      Abstract: g-C3N4 has received much attention due to its role in photocatalytic hydrogen evolution and contaminants degradation. Nevertheless, the photocatalytic property of bulk g-C3N4 (BCN) is seriously restricted owing to its short photo-generated carrier lifetime, small specific surface area and low visible light utilization rate, etc. In this study, nanosheet constructing and heteroatom phosphorus (P) doping, as two important strategies, are synergistically adopted to co-enhance its activity. The controllable P atoms were successfully doped into the framework of g-C3N4 nanosheet (NCN-P) through forming P-N bond. The optimized NCN-P sample displays an excellent H2 production rate (3263.99 µmol·g−1·h−1) under white LED light irradiation, which is more than 11.6 times that of the BCN. Moreover, it also exhibits excellent photocatalytic degradation ratio of tetracycline reached 80% in 1 h. Furthermore, the optimized NCN-P sample still maintains robust photocatalytic performance after recycling tests, making it as a bright prospect photocatalyst for solar energy utilization and contaminants removal. Graphic
      PubDate: 2021-12-01
       
 
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