Subjects -> ENGINEERING (Total: 2688 journals)
    - CHEMICAL ENGINEERING (229 journals)
    - CIVIL ENGINEERING (237 journals)
    - ELECTRICAL ENGINEERING (176 journals)
    - ENGINEERING (1325 journals)
    - ENGINEERING MECHANICS AND MATERIALS (452 journals)
    - HYDRAULIC ENGINEERING (56 journals)
    - INDUSTRIAL ENGINEERING (98 journals)
    - MECHANICAL ENGINEERING (115 journals)

ENGINEERING (1325 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted by number of followers
Composite Structures     Hybrid Journal   (Followers: 247)
Composites Part B : Engineering     Hybrid Journal   (Followers: 221)
IEEE Spectrum     Full-text available via subscription   (Followers: 220)
ACS Nano     Hybrid Journal   (Followers: 183)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 176)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 152)
Composites Science and Technology     Hybrid Journal   (Followers: 150)
IEEE Instrumentation & Measurement Magazine     Hybrid Journal   (Followers: 150)
IEEE Communications Magazine     Full-text available via subscription   (Followers: 140)
IEEE Engineering Management Review     Full-text available via subscription   (Followers: 118)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 114)
IEEE Transactions on Control Systems Technology     Hybrid Journal   (Followers: 112)
IEEE Transactions on Instrumentation and Measurement     Hybrid Journal   (Followers: 107)
IEEE Transactions on Signal Processing     Hybrid Journal   (Followers: 92)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 88)
IEEE Industry Applications Magazine     Full-text available via subscription   (Followers: 82)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 79)
IEEE Transactions on Engineering Management     Hybrid Journal   (Followers: 74)
Engineering Failure Analysis     Hybrid Journal   (Followers: 68)
IEEE Microwave Magazine     Full-text available via subscription   (Followers: 63)
IEEE Signal Processing Letters     Hybrid Journal   (Followers: 60)
IEEE Transactions on Reliability     Hybrid Journal   (Followers: 53)
Experimental Techniques     Hybrid Journal   (Followers: 51)
IET Radar, Sonar & Navigation     Open Access   (Followers: 50)
IEEE Transactions on Microwave Theory and Techniques     Hybrid Journal   (Followers: 49)
Control Engineering Practice     Hybrid Journal   (Followers: 46)
IEEE Journal of Selected Topics in Signal Processing     Hybrid Journal   (Followers: 43)
Biotechnology Progress     Hybrid Journal   (Followers: 42)
IEEE Potentials     Full-text available via subscription   (Followers: 42)
IEEE Journal on Selected Areas in Communications     Hybrid Journal   (Followers: 39)
Heat Transfer Engineering     Hybrid Journal   (Followers: 36)
IET Microwaves, Antennas & Propagation     Open Access   (Followers: 35)
International Journal for Numerical Methods in Engineering     Hybrid Journal   (Followers: 35)
IEEE Microwave and Wireless Components Letters     Hybrid Journal   (Followers: 35)
Digital Signal Processing     Hybrid Journal   (Followers: 34)
IEEE Transactions on Knowledge and Data Engineering     Hybrid Journal   (Followers: 32)
AIChE Journal     Hybrid Journal   (Followers: 31)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 31)
Computers & Geosciences     Hybrid Journal   (Followers: 30)
Flow, Turbulence and Combustion     Hybrid Journal   (Followers: 30)
Coastal Management     Hybrid Journal   (Followers: 29)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 28)
GPS Solutions     Hybrid Journal   (Followers: 28)
Fluid Dynamics     Hybrid Journal   (Followers: 27)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 27)
Géotechnique     Hybrid Journal   (Followers: 27)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 27)
IEEE Transactions on Power Delivery     Hybrid Journal   (Followers: 26)
Applied Energy     Partially Free   (Followers: 26)
Advances in Engineering Software     Hybrid Journal   (Followers: 26)
IEEE Journal of Solid-State Circuits     Full-text available via subscription   (Followers: 24)
Corrosion Science     Hybrid Journal   (Followers: 23)
Engineering & Technology     Hybrid Journal   (Followers: 22)
IET Image Processing     Open Access   (Followers: 22)
Intermetallics     Hybrid Journal   (Followers: 21)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 21)
IEEE Transactions on Electronics Packaging Manufacturing     Hybrid Journal   (Followers: 21)
IET Signal Processing     Open Access   (Followers: 21)
IEEE Transactions on Circuits and Systems II: Express Briefs     Hybrid Journal   (Followers: 20)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 20)
Implementation Science     Open Access   (Followers: 20)
International Journal for Numerical Methods in Fluids     Hybrid Journal   (Followers: 19)
Engineering Optimization     Hybrid Journal   (Followers: 19)
International Communications in Heat and Mass Transfer     Hybrid Journal   (Followers: 19)
Electrophoresis     Hybrid Journal   (Followers: 18)
IET Circuits, Devices & Systems     Open Access   (Followers: 18)
IEEE/ACM Transactions on Computational Biology and Bioinformatics     Hybrid Journal   (Followers: 18)
International Journal of Adhesion and Adhesives     Hybrid Journal   (Followers: 18)
IEEE Transactions on Intelligent Transportation Systems     Hybrid Journal   (Followers: 17)
Experiments in Fluids     Hybrid Journal   (Followers: 17)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Integration     Hybrid Journal   (Followers: 16)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 16)
Engineering Geology     Hybrid Journal   (Followers: 16)
European Journal of Mass Spectrometry     Hybrid Journal   (Followers: 16)
Energy Conversion and Management     Hybrid Journal   (Followers: 15)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 15)
Coastal Engineering     Hybrid Journal   (Followers: 15)
IEEE Transactions on Magnetics     Hybrid Journal   (Followers: 14)
IEEE Journal of Biomedical and Health Informatics     Hybrid Journal   (Followers: 14)
IEEE Transactions on Automation Science and Engineering     Full-text available via subscription   (Followers: 13)
IEEE Transactions on Evolutionary Computation     Hybrid Journal   (Followers: 13)
Electromagnetics     Hybrid Journal   (Followers: 13)
Computers and Geotechnics     Hybrid Journal   (Followers: 12)
IEEE Transactions on Semiconductor Manufacturing     Hybrid Journal   (Followers: 12)
IET Renewable Power Generation     Open Access   (Followers: 12)
Human Factors in Ergonomics & Manufacturing     Hybrid Journal   (Followers: 12)
IEEE Transactions on Professional Communication     Hybrid Journal   (Followers: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 11)
IEEE Transactions on Education     Hybrid Journal   (Followers: 11)
CIRP Annals - Manufacturing Technology     Hybrid Journal   (Followers: 11)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 10)
International Journal of Antennas and Propagation     Open Access   (Followers: 10)
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering     Hybrid Journal   (Followers: 10)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 10)
IEEE Transactions on Plasma Science     Hybrid Journal   (Followers: 10)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 9)
Fuel Cells Bulletin     Full-text available via subscription   (Followers: 9)
Computational Optimization and Applications     Hybrid Journal   (Followers: 9)
Annals of Science     Hybrid Journal   (Followers: 9)
European Journal of Engineering Education     Hybrid Journal   (Followers: 9)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
IEEE Technology and Society Magazine     Full-text available via subscription   (Followers: 8)
Fuel Cells     Hybrid Journal   (Followers: 8)
Adaptive Behavior     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 8)
Energy Engineering     Full-text available via subscription   (Followers: 8)
IEEE Transactions on Advanced Packaging     Full-text available via subscription   (Followers: 8)
Clay Minerals     Hybrid Journal   (Followers: 8)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Applied Catalysis A: General     Hybrid Journal   (Followers: 7)
International Journal of Applied Ceramic Technology     Hybrid Journal   (Followers: 7)
Basin Research     Hybrid Journal   (Followers: 7)
Discrete Optimization     Full-text available via subscription   (Followers: 7)
Designs, Codes and Cryptography     Hybrid Journal   (Followers: 7)
IEEE Journal of Selected Topics in Quantum Electronics     Hybrid Journal   (Followers: 7)
Environmental and Ecological Statistics     Hybrid Journal   (Followers: 7)
Biomicrofluidics     Open Access   (Followers: 7)
Geothermics     Hybrid Journal   (Followers: 7)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 7)
IEEE Vehicular Technology Magazine     Full-text available via subscription   (Followers: 7)
Catalysis Communications     Hybrid Journal   (Followers: 7)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 7)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Fusion Engineering and Design     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Formal Methods in System Design     Hybrid Journal   (Followers: 6)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Advances in OptoElectronics     Open Access   (Followers: 6)
International Journal of Adaptive Control and Signal Processing     Hybrid Journal   (Followers: 5)
IEEE Transactions on Vehicular Technology     Hybrid Journal   (Followers: 5)
IET Science, Measurement & Technology     Open Access   (Followers: 5)
IEEE Transactions on Applied Superconductivity     Hybrid Journal   (Followers: 5)
International Journal of Architectural Computing     Full-text available via subscription   (Followers: 5)
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 5)
Focus on Powder Coatings     Full-text available via subscription   (Followers: 5)
Engineering With Computers     Hybrid Journal   (Followers: 5)
Proceedings of the Institution of Civil Engineers - Engineering Sustainability     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Active and Passive Electronic Components     Open Access   (Followers: 5)
Proceedings of the Institution of Civil Engineers - Ground Improvement     Hybrid Journal   (Followers: 4)
Frontiers in Energy     Hybrid Journal   (Followers: 4)
Adsorption     Hybrid Journal   (Followers: 4)
Catalysis Today     Hybrid Journal   (Followers: 4)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Fluid Phase Equilibria     Hybrid Journal   (Followers: 4)
Graphs and Combinatorics     Hybrid Journal   (Followers: 4)
Filtration & Separation     Full-text available via subscription   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Grass and Forage Science     Hybrid Journal   (Followers: 4)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Informatik-Spektrum     Hybrid Journal   (Followers: 3)
Engineering Computations     Hybrid Journal   (Followers: 3)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 3)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Focus on Pigments     Full-text available via subscription   (Followers: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Frontiers of Environmental Science & Engineering     Hybrid Journal   (Followers: 3)
Fuzzy Sets and Systems     Hybrid Journal   (Followers: 3)
Catalysis Letters     Hybrid Journal   (Followers: 3)
IET Generation, Transmission & Distribution     Open Access   (Followers: 2)
Historical Records of Australian Science     Hybrid Journal   (Followers: 2)
IET Optoelectronics     Open Access   (Followers: 2)
Assembly Automation     Hybrid Journal   (Followers: 2)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
Aerobiologia     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 2)
Comptes Rendus : Mécanique     Open Access   (Followers: 2)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
IEEE Latin America Transactions     Full-text available via subscription   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
ESAIM: Control Optimisation and Calculus of Variations     Open Access   (Followers: 2)
Focus on Surfactants     Full-text available via subscription   (Followers: 2)
Engineering Analysis with Boundary Elements     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Foundations of Science     Hybrid Journal   (Followers: 1)
Forschung     Hybrid Journal   (Followers: 1)
European Journal of Lipid Science and Technology     Hybrid Journal   (Followers: 1)
Antarctic Science     Hybrid Journal   (Followers: 1)
Épités - Épitészettudomány     Full-text available via subscription   (Followers: 1)
Dyes and Pigments     Hybrid Journal   (Followers: 1)
Bautechnik     Hybrid Journal   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Designed Monomers and Polymers     Open Access   (Followers: 1)
Color Research & Application     Hybrid Journal   (Followers: 1)
Abstract and Applied Analysis     Open Access   (Followers: 1)
Focus on Catalysts     Full-text available via subscription  
ESAIM: Proceedings     Open Access  
Environmetrics     Hybrid Journal  
COMBINATORICA     Hybrid Journal  
Chinese Science Bulletin     Open Access  
Calphad     Hybrid Journal  
Boundary Value Problems     Open Access  

        1 2 3 4 5 6 7 | 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  [2469 journals]
  • Supported NHC-Benzimi@Cu Complex as a Magnetically Separable and Reusable
           Catalyst for the Multicomponent and Click Synthesis of 1,4-Disubstituted
           1,2,3-Triazoles via Huisgen 1,3-Dipolar Cycloaddition

    • Free pre-print version: Loading...

      Abstract: In this paper, we report a novel magnetically separable silica coated copper nano-magnetite NHC-benzimi@Cu complex as heterogeneous catalyst for the multicomponent click reaction via Huisgen 1,3-dipolar cycloaddition reaction of alkyl or aryl halide, sodium azide and terminal alkyne, which affords various1,4-disubstituted 1,2,3-triazoles. The multistep prepared nano catalyst has been characterized by various spectroscopic methods such as FT-IR, TGA, EDX, XRD, TEM and VSM. The heterogeneous nano catalyst structures coated on the copper surface are responsible for the excellent catalyst performances in the reaction. The reusability of the catalyst makes the present protocol more fascinating from an environmental and economic point of view. Graphic
      PubDate: 2022-06-01
       
  • Catalytic Ozonation of Quinoline Utilizing Manganese-Based Catalyst with
           Abundant Oxygen Vacancies

    • Free pre-print version: Loading...

      Abstract: S-MnO2, Cl-MnO2, and Ac-MnO2 samples were prepared by redox method with the oxidant (KMnO4) and the reducing agent precursors [MnSO4, MnCl2 and Mn(Ac)2]. This work studied the influence of the precursors on the catalytic performance. Ac-MnO2 was aminated and doped with graphene to obtain the modified manganese-based catalyst MnO2-NH2-GO. XRD, Raman, FTIR, XPS, NH3-TPD, CV (cyclic voltammetry) were used to characterize the catalyst. The average oxidation state (AOS) of Mn element was also calculated. The results of the catalytic ozonation quinoline degradation experiment shown that the four catalysts was ranked as follows: S-MnO2 < Cl-MnO2 < Ac-MnO2 < MnO2-NH2-GO, which was related to the catalyst crystal structure, oxygen vacancy (Ovac)content, AOS, and catalyst surface acidity and other factors. The effects of CO32−, HCO3−, SO42−, and Cl− on the catalytic reaction were investigated, the effects of different anions vary greatly. By adding tertiary butyl alcohol (tBA) and benzoquinone (pBQ) radical scavengers, it was confirmed that OH and O2− coexisted, but O2− contributed much more to oxidation than OH. Graphic
      PubDate: 2022-06-01
       
  • Charge Modified Porous Organic Polymer Stabilized Ultrasmall Platinum
           Nanoparticles for the Catalytic Dehydrogenative Coupling of Silanes with
           Alcohols

    • Free pre-print version: Loading...

      Abstract: Developing an ideal stabilizer to prevent the aggregation of nanoparticles is still a big challenge for the practical application of noble metal nanocatalysts. Herein, we develop a charge (NTf2−) modified porous organic polymer (POP-NTf2) to stabilize ultrasmall platinum nanoparticles. The catalyst is characterized and applied in the catalytic dehydrogenative coupling of silanes with alcohols. The catalyst exhibits excellent catalytic performance with highly dispersed ultrasmall platinum nanoparticles (ca. 2.22 nm). Moreover, the catalyst can be reused at least five times without any performance significant loss and Pt NPs aggregation. Graphic
      PubDate: 2022-06-01
       
  • Boosting CO Hydrogenation Performance of Facile Organics Modified Iron
           Oxide/Reduced Graphene Oxide Catalysts

    • Free pre-print version: Loading...

      Abstract: Organics including terephthalic acid and glucose are added to selectively adsorb on iron oxide or graphene oxide, which can further modify the structure properties and metal-support interaction of iron oxide/reduced graphene oxide catalysts. The proper metal-support interaction is favorable for the reduction and carburization of iron oxide to form more active sites for CO hydrogenation. Thus, higher CO conversion and heavier hydrocarbons are achieved over organics modified catalysts. This simple, eco-friendly and economic viable method opens a new avenue from molecular level for the design of highly active supported catalysts. Graphic
      PubDate: 2022-06-01
       
  • Simple Thermocatalytic Oxidation Degradation of VOCs

    • Free pre-print version: Loading...

      Abstract: Volatile organic compounds (VOCs) are a class of pollutants with many sources and harm humans and the environment. The application of noble metal catalysts and metal oxide catalysts in thermal catalytic oxidation degradation of VOCs was reviewed in this paper. Furthermore, the challenges of degradation of VOCs by thermal catalytic oxidation are listed and the prospects are put forward. Graphic
      PubDate: 2022-06-01
       
  • In Situ Fabrication of 1D WO3 Nanorod/2D ZnWO4 Nanosheet Heterojunction
           for Enhanced Photoelectrochemical Performance

    • Free pre-print version: Loading...

      Abstract: The 1D WO3 nanorod/2D ZnWO4 nanosheet heterojunction arrays were successfully fabricated by combining a facile hydrothermal and in situ solvothermal growth reaction. The structure and morphology of the pristine WO3 and WO3/ZnWO4 heterojunction arrays were characterized by XRD, FESEM, TEM and HRTEM while the chemical composition and surface properties were characterized by XPS. The 2D ZnWO4 nanosheets were uniformly grown on the surface of the 1D WO3 nanorods which resulted in a large active surface area. The charge carriers separation can be improved because of the energy band structure match between WO3 and ZnWO4, which will more efficiently enhance the photoelectrochemical performance. The photocurrent densities of the WO3/ZnWO4 heterojunction photoanode reached to 2.53 mA/cm2 at 1.23 V versus RHE, nearly 1.6 times of the pristine WO3 photoanode under visible light illumination. Graphic
      PubDate: 2022-06-01
       
  • Reduction of NOx by H2 on WOx-Promoted Pt/Al2O3/SiO2 Catalysts Under
           O2-Rich Conditions

    • Free pre-print version: Loading...

      Abstract: This work addresses the reduction of NOx by H2 under O2-rich conditions using Al2O3/SiO2-supported Pt catalysts with different loads of WOx promotor. The samples were thoroughly characterised by N2 physisorption, temperature-programmed desorption of CO, scanning electron microscopy, X-ray diffraction, laser raman spectroscopy, X-ray photoelectron spectroscopy and diffuse reflectance infrared fourier transform spectroscopy with probe molecule CO. The catalytic studies of the samples without WOx showed pronounced NOx conversion below 200 °C, whereas highest efficiency was related to small Pt particles. The introduction of WOx provided increasing deNOx activity as well as N2 selectivity. This promoting effect was referred to an additional reaction path at the Pt-WOx/Al2O3/SiO2 interface, whereas an electronic activation of Pt by strong metal support interaction was excluded. Graphic
      PubDate: 2022-06-01
       
  • The Highly Effective Cobalt Based Metal–Organic Frameworks Catalyst for
           One Pot Oxidative Esterification Under Mild Conditions

    • Free pre-print version: Loading...

      Abstract: The cobalt-based metal organic frameworks (Co-MOFs) catalyst has been prepared with using terephthalic acid and 4,4′-bipyridine as organic linkers by facile solvothermal method for one pot oxidative esterification. The prepared catalyst was pyrolysed at different temperature and then applied for oxidation of aldehyde using molecular oxygen as benign oxidant under mild conditions. The Co-MOFs pyrolysed at 800 °C (denoted as Co-MOFs-800) catalyst exhibited excellent catalytic activity, selectivity and recyclability toward the oxidative esterification of benzaldehydes. Furthermore, it can be reused up to 5 runs without significant loss of activity. Graphic
      PubDate: 2022-06-01
       
  • Study of Cu/Mn Catalysts for Coreactions of NH3-SCR and CO Oxidation

    • Free pre-print version: Loading...

      Abstract: To explore the possibility of coreaction of selective catalytic reduction with NH3 (NH3-SCR) and CO oxidation (CO-O), bimetallic doping catalysts of Mn and Cu were synthesized by a coprecipitation method, and XRD results showed coexisting Mn3O4 and CuO phases in this material. The evaluation results showed that Cu1Mn2 exhibits the highest activity among the investigated catalysts, with NO and CO conversions of up to 100% and 96.4% at 125 °C, respectively. The NO and CO conversions are 66.1% and 40.6% higher for the coordinate reaction than for the separate reaction for Cu1Mn2 at 125 °C. Cu1Mn2 has the highest number of acid sites and the strongest acidity, as well as the highest oxidation and reduction activities, among the investigated catalysts. Electronic transfer (Cu2+ + Mn3+ ↔ Mn4+ + Cu+) between copper and manganese cations in the Cu–Mn catalysts was validated. The feasibility of the coreaction of NH3-SCR and CO-O was verified in this study, and Cu doping was shown to be critical for the simultaneous reaction of NH3-SCR and CO-O. Graphic
      PubDate: 2022-06-01
       
  • Poly(vinyl Alcohol)-Alginate Immobilized Trametes versicolor IBL-04
           Laccase as Eco-friendly Biocatalyst for Dyes Degradation

    • Free pre-print version: Loading...

      Abstract: Laccase-based biocatalysts are promising agents for the remediation of environmental pollutants. However, stability, reusability, and cost-effectiveness remain a challenge for biochemical engineering. Herein, Trametes versicolor IBL-04 laccase was immobilized on poly(vinyl alcohol) (PVA)-alginate beads. The maximum immobilization efficiency was observed using a 2.5 mm bead size with 12% (w/v) PVA and 2% (w/v) alginate concentration. The native enzyme displayed optimal activity at pH 5.0, and 45 °C, which was improved to pH 6 and 70 °C in PVA-alginate immobilized biocatalyst. PVA-alginate immobilized laccase presented comparatively high Vmax (from 720 to 962 U/mL) and low Km (from 70 to 12 µM) values from the native enzyme. Immobilized laccase was applied to catalyze the decolorization of various textile dye pollutants, including Rhodamine B, Reactive Black 5 (RB5), Drimaren Red and Drimaren Turquoise. Results revealed almost complete decolorization and decomposition of all dye’s solution by the laccase-assisted biocatalytic reaction. Prominent peaks of untreated dyes observed in the visible region disappeared following enzymatic treatment, and the appearance of any new peaks was not detected during the enzyme-mediated degradation process. In conclusion, immobilizing laccase on PVA-alginate matrix offers a facile and cost-efficient approach to remediate dyes and exhibit considerable potential for numerous biochemical engineering applications. Graphic
      PubDate: 2022-06-01
       
  • Characters of Inulin Conversion Induced by Inulinase in Ultrafiltration
           Membrane Bioreactor

    • Free pre-print version: Loading...

      Abstract: The objective of this study was to convert inulin to high output fructose with the commercial inulinase in the continuous ultrafiltration membrane bioreactor (UFMB). The effects of operational conditions were explored for the volumetric productivity. The model equations of kinetics and membrane fouling were also founded. The stable fructose production with the volumetric productivity was attained at the optimum condition of inulin concentration (100 g/L), E/S ratio (40 U/g) and residence time (20 min). The kinetics results showed that the experimental data obtained were fit to the model equations. Preliminary experimental results were attained the fundamental membrane fouling mechanism. These results demonstrated its feasibility and availability for efficient fructose production, which were beneficial to provide theoretical basis for further researches. Graphic The operational conditions were explored for the volumetric productivity. Model equations and parameters of kinetics were founded and obtained. The membrane fouling mechanism of UFMB system was founded.
      PubDate: 2022-06-01
       
  • Mn-Doped NiFe Layered Double Hydroxide Nanosheets Decorated by Co(OH)2
           Nanosheets: A 3-Dimensional Core–Shell Catalyst for Efficient Oxygen
           Evolution Reaction

    • Free pre-print version: Loading...

      Abstract: Exploiting highly active and robust non-noble-metal electrocatalysts for oxygen evolution reaction (OER) occupies an important position in alleviating energy crisis and maintaining social sustainability. Herein, we have grown Co(OH)2 nanoarrays in situ on Mn-doped NiFe LDH nanosheets to construct Mn-doped NiFe LDH@Co(OH)2/NF (MNF@Co(OH)2/NF) with core–shell structure. Due to the optimized electronic structure by manganese ion doping and the high density exposure of active sites induced by cobalt hydroxide coating, the MNF@Co(OH)2/NF exhibits excellent OER performances, which possesses ultralow overpotentials of 193 and 244 mV at the current densities of 10 and 100 mA cm−2 separately, and possesses a small Tafel slope of 48.4 mV dec−1. This work offers a new perspective for the rational construction of efficient OER electrocatalysts with multi-dimensional nanostructures to improve the catalytic activity. Graphic
      PubDate: 2022-06-01
       
  • A Novel B-Doped NiP/Hβ Catalyst for n-hexane Isomerization with
           Synergistic Catalytic Mechanism of Metal Sites–Acid Sites

    • Free pre-print version: Loading...

      Abstract: Novel B-doped NiP/Hβ (Hβ is the hydrogen proton exchanged β molecular sieve) catalysts were prepared and the catalytic performance for n-C6 (n-hexane) isomerization was studied firstly. It was found that the mole ratio of Ni, P and B in preparing B-doped NiP had important influence on the crystalline structure and catalytic activity of NiPB. When the mole ratio of Ni, P and B was 1:1:1, the prepared NiPB was amorphous and NiPB/Hβ had the best catalytic activity with the conversion rate of n-C6, the yield and selectivity of isoparaffins being 79.93%, 78.34% and 98.01% respectively. It was also showed that the preparation conditions of catalyst including NiPB loading on carrier and calcination temperatures were the key factors for the catalytic performance of NiPB/Hβ. In controlled experiments, ammonia poisoned acid sites on the catalyst led to the markedly reducing of catalytic performance and metal sites were essentially for the dehydrogenation-hydrogenation reaction. The isomerization of n-C6 catalyzed by NiPB/Hβ is a continuous alternating process of acid catalysis and metal catalysis, and the matching of acid sites and metal sites is of importance. Graphic
      PubDate: 2022-06-01
       
  • One-Pot Three-Component Synthesis of 2,4,5-Triaryl-1H-imidazoles Using
           Mn2+ Complex of [7-Hydroxy-4-methyl-8-coumarinyl] Glycine as a
           Heterogeneous Catalyst

    • Free pre-print version: Loading...

      Abstract: A highly efficient and simple synthesis of 2,4,5-trisubstituted imidazoles has been developed using highly reusable support‐free Mn2+complex of [7-hydroxy-4-methyl-8-coumarinyl] glycine as a heterogeneous catalyst via a one-pot three-component reaction of benzil, aldehydes and ammonium acetate as a nitrogen source. Moreover, this catalyst was characterized by various techniques such as field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX), FT-IR spectroscopy, powder X-ray diffraction (XRD), inductively coupled plasma (ICP) and thermal gravimetric analysis (TGA). Also, the catalyst is stable and could be reused for at least six times without significant loss of activity. Graphic
      PubDate: 2022-06-01
       
  • Sorption and Reaction of Biomass Derived HC Blends and Their Constituents
           on a Commercial Pt–Pd/Al2O3 Oxidation Catalyst

    • Free pre-print version: Loading...

      Abstract: Within the Research Cluster of Excellence “The Fuel Science Center” at RWTH Aachen University, the production and application of new fuels from bio-based carbon feedstocks and CO2 with hydrogen from renewable electricity generation is being investigated. In this study, the storage and oxidation of ethanol, 1-butanol, 2-butanone, cyclopentanone, and cyclopentane as well as two blends thereof on a series production Pt–Pd/Al2O3 oxidation catalyst were investigated. Hydrocarbon (HC) storage and temperature-programmed surface reaction (TPSR) experiments were carried out to analyze their adsorption and desorption behavior. In addition, the individual HCs and both blends were investigated using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (TP-DRIFTS). In general, all oxygenated HCs are adsorbed more strongly than cyclopentane due to their higher polarity. Interestingly, it could be observed that the two different blends [blend 1: ethanol (50 mol %), 2-butanone (21 mol %), cyclopentanone (14 mol %) and cyclopentane (15 mol %); blend 2: 1-butanol (45 mol %), ethanol (29 mol %) and cyclopentane (27 mol %)] exhibit a different storage behavior compared to the single hydrocarbons. It was shown that the presence of 1-butanol and cyclopentane in blend 2 strongly inhibits the oxidation of ethanol. As a result, the ethanol light-off temperature was increased by at least 100 K. A difference was also found in the storage behavior of cyclopentane. While no significant storage could be detected in the pure compound experiment, the experiments with both mixtures showed a larger amount stored. The presence of adsorbed species of the hydrocarbons and their corresponding reaction products has been demonstrated and gives an insight into the storage mechanism of blends. Graphic
      PubDate: 2022-06-01
       
  • Efficient Methanol-to-Olefins Conversion Via Photothermal Effect Over
           TiN/SAPO-34 Catalyst

    • Free pre-print version: Loading...

      Abstract: As one of the most promising routes for production of low-carbon olefins (e.g., ethene and propene etc.), methanol-to-olefins (MTO) reaction is influenced largely by the temperature. Noble metal (e.g., Au, Ag, etc.) nanoparticles are known to exhibit the localized surface plasmon resonance (LSPR) effect, which has been applied in photothermal reactions. Owing to the increased light absorption ability in near-infrared region, titanium nitride (TiN) nanoparticles exhibit a superior LSPR effect over noble metals. Herein, we report on the MTO reaction via photothermal effect over a series of TiN(x)/SAPO-34 (x = 0.5, 0.75, 1, 2, 5, 10, 13 wt%) catalysts prepared by a simple mechanical grinding method. The MTO reaction over TiN(x)/SAPO-34 was carried out under a 300 W xenon lamp irradiation. The MTO reactivity of TiN(x)/SAPO-34 was influenced by both the photothermal temperature from the LSPR effect of TiN nanoparticles and the Brønsted acid sites on SAPO-34, both of which were dependent on the loading amount of TiN nanopartiles. The synergistic effect of high photothermal temperature, sufficient Brønsted acid sites and moderate BET surface area gave rise to the optimal catalytic performance of MTO reaction over TiN(10)/SAPO-34, which exhibited a methanol conversion of 73.1% and an ethene selectivity of 62.5%. Graphic
      PubDate: 2022-06-01
       
  • Hydrogenomics: Efficient and Selective Hydrogenation of Stable Molecules
           Utilizing Three Aspects of Hydrogen

    • Free pre-print version: Loading...

      Abstract: Hydrogen is chemically flexible revealing three aspects; protium (H \(^0\) ), proton (H \(^+\) ), and hydride (H \(^-\) ), which are active toward hydrogenation reactions. While the reactivity of protium is characterized by the potential energy at a catalyst surface, electron transfer is of importance as an additional degree of freedom in the reactions with proton and hydride. A promising strategy is to make full use of these active hydrogen species for hydrogenation of stable molecules and achieve chemical transformation of these molecules, which we call “Hydrogenomics”. By reviewing recent studies on the hydrogenation of hydrocarbon, carbon dioxide, dinitrogen, and so on using these active hydrogen species on model metal surfaces, nanoscale electrocatalysts, and multimetallic polyhydride clusters, we discuss the fundamental concepts behind the reactions and possible control of the efficient and selective hydrogenation reactions. Graphic
      PubDate: 2022-06-01
       
  • Highly Efficient Zirconium Based Carbonaceous Solid Acid Catalyst for
           Selective Synthesis of 5-HMF from Fructose and Glucose in Isopropanol as a
           Solvent

    • Free pre-print version: Loading...

      Abstract: A new zirconium based carbonaceous solid acid catalyst Zr@CC-PA with both Lewis and Bronsted acidic sites was prepared by simultaneous carbonization and phosphonation of glucose followed by incorporation of zirconium metal on the surface of the catalyst. The catalyst was easy to prepare and the synthesized catalyst was well characterized using different techniques such as FT-IR, P-XRD, EDAX, SEM, TEM and XPS analysis. The catalytic activity was evaluated for synthesis of a very important platform chemical 5-HMF from fructose to glucose using isopropanol as a solvent. The catalyst was found to be highly efficient giving 86% yield of 5-HMF from fructose and 45% yield from glucose with high selectively. The catalyst can be reused at least four times without depreciation in its catalytic activity. The catalytic method developed is efficient, green and economical. Graphic abstract
      PubDate: 2022-06-01
       
  • Highly Active Fe3O4@SBA-15@NHC-Pd Catalyst for Suzuki–Miyaura
           Cross-Coupling Reaction

    • Free pre-print version: Loading...

      Abstract: A novel Pd-NHC functionalized magnetic Fe3O4@SBA-15@NHC-Pd was synthesized and used as an efficient heterogeneous catalyst in the Suzuki–Miyaura C–C bond formation reactions. The Fe3O4@SBA-15@NHC-Pd characterized by X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray analysis (EDX), Thermogravimetric Analysis (TGA), Differential Thermal Analysis (DTA). The Inductively Coupled Plasma-Optical emission spectroscopy (ICP-OES) analysis was used to determine the exact amount of Pd (0.33 wt%) in Fe3O4@SBA-15@NHC-Pd. The TEM images of the catalyst showed the existence of palladium nanoparticles immobilized in the catalyst's structure, while no reducing agent was used. The NHC moieties in the catalyst structure could be stabilize Pd(0) nanoparticles prevents agglomeration. The magnetic catalyst was effectively used in the Suzuki–Miyaura cross-coupling reaction of substituted phenylboronic acid derivatives with (hetero)aryl bromides in the presence of a K2CO3 at room temperature in aqueous media and magnetic catalyst could be simply extracted from the reaction mixture by an external magnet. Different aryl bromides were converted to coupled-products in excellent yields with spectacular TOFs values (up to 1,960,339 h−1); in the presence of 1 mg of Fe3O4@SBA-15@NHC-Pd catalyst (contains 3.1 × 10–6 mol% Pd) at room temperature in aqueous media. After reusability experiments, it is found that this catalyst was effectively used up to ten times in the reaction with almost consistent catalytic efficiency. A decrease in the activity of the 10th reused catalyst was found as 9%. Graphic
      PubDate: 2022-06-01
       
  • Zinc Oxide/Graphene Oxide as a Robust Active Catalyst for Direct Oxidative
           Synthesis of Nitriles from Alcohols in Water

    • Free pre-print version: Loading...

      Abstract: In this work, without using any linker or chemical modification of graphene oxide, a zinc oxide immobilized graphene oxide-based catalyst was used for the direct aerobic oxidative conversion of alcohols to the nitriles in water. In the first step, graphene oxide was prepared and then zinc ions were electrostatically adsorbed onto the surface of graphene oxide. In the following step, zinc oxide nanoparticles were generated via in-situ growth in presence of NaOH. It was illustrated that graphene oxide layers can control the size of in-situ generated zinc oxide nanoparticles. Various aromatic/aliphatic/heteroaromatic primary alcohols converted to the nitriles in high yields under O2 balloon with ZnO/GO catalyst. This catalyst can be used for 7 successful consecutive runs without significant loss of activity. Graphic
      PubDate: 2022-06-01
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 34.231.244.12
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-