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ENGINEERING (1267 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: 8)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 273)
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: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Journal of Graduate Research     Open Access  
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
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: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 44)
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: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 24)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
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: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 5)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
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: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
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: 1)
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: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
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: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal   (Followers: 1)
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Bitlis Eren University Journal of Science and Technology     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: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
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: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 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: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Full-text available via subscription   (Followers: 9)
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: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 14)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 278)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 209)
Composites Part B : Engineering     Hybrid Journal   (Followers: 250)
Composites Science and Technology     Hybrid Journal   (Followers: 193)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 16)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 7)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)

        1 2 3 4 5 6 7 | Last

Journal Cover
Applied Catalysis A: General
Journal Prestige (SJR): 1.237
Citation Impact (citeScore): 4
Number of Followers: 6  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0926-860X
Published by Elsevier Homepage  [3163 journals]
  • A comparative study on Ce–Pr and Ce–Mn mixed oxide catalysts toward
           soot catalytic combustion
    • Authors: Bing Zhou; Kang Xi; Li-Jia Fan; Ying Zhou; Yue Wang; Qiu-Lian Zhu; Han-Feng Lu
      Pages: 1 - 10
      Abstract: Publication date: 25 July 2018
      Source:Applied Catalysis A: General, Volume 562
      Author(s): Bing Zhou, Kang Xi, Li-Jia Fan, Ying Zhou, Yue Wang, Qiu-Lian Zhu, Han-Feng Lu
      CePr and CeMn mixed oxide catalysts were synthesized by inserting Pr and Mn atoms into CeO2. Catalytic performance on soot combustion was investigated, and several characterizations were carried out using X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area analysis, H2 temperature-programmed reduction, and X-ray diffraction. Results show that a cubic fluorite structure solid solution can be formed with Pr and Mn doped into CeO2 lattice. Three oxygen species, namely, lattice oxygen OI (O2−), defect oxygen species OII (O2 −, O2 2−, and O−), and hydroxyl-like groups and adsorbed molecular water OIII, exist in the solid solution structure. In general, the defect oxygen species OII is responsible for soot combustion. CePr exhibits fast oxidation rate because of the presence of open oxygen migration channel (OI↔OII↔OIII), and reactive oxygen species OII can continue to be replenished. CeMn possesses a large amount of surface active oxygen, which results in excellent low-temperature catalytic activity.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.034
      Issue No: Vol. 562 (2018)
  • Phosphonic acid promotion of supported Pd catalysts for low temperature
           vanillin hydrodeoxygenation in ethanol
    • Authors: Pengxiao Hao; Daniel K. Schwartz; J. Will Medlin
      Pages: 1 - 6
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Pengxiao Hao, Daniel K. Schwartz, J. Will Medlin
      Bifunctional catalysts with activity for both hydrogenation and dehydration have been frequently investigated for hydrodeoxygenation (HDO). Here, we report the application of organophosphonic acids (PAs) to Pd/Al2O3 catalysts for low-temperature vanillin HDO. Reaction studies indicated that PA-modification significantly improved the liquid-phase HDO activity; the yield to the desirable product, p-creosol (CR), increased from 2.5% to 87% at 50 °C. This improvement was attributed to the creation of metal/acid bifunctional sites upon PA modification. In addition, HDO activity positively correlated with the Brønsted acidity of the PA modifier, which could be tuned by adjusting the PA tail functionality.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.008
      Issue No: Vol. 561 (2018)
  • Modified Harrick reaction cell for in situ/operando fiber optics diffuse
           reflectance UV–visible spectroscopic characterization of catalysts
    • Authors: Priya D. Srinivasan; Steven R. Nitz; Kyle J. Stephens; Ed Atchison; Juan J. Bravo-Suarez
      Pages: 7 - 18
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Priya D. Srinivasan, Steven R. Nitz, Kyle J. Stephens, Ed Atchison, Juan J. Bravo-Suarez
      UV–visible (UV–vis) spectroscopy is a common, powerful, and affordable technique for the characterization of heterogeneous catalysts. Here, we present an improved design of the commercial ubiquitous Harrick Scientific high temperature reaction cell for use in diffuse reflectance (DR) UV–vis spectroscopy with fiber optics at very close proximity of a catalyst sample and with high time resolution. The cell possesses significant dead volume which was reduced by a homemade compact dome and by volume reduction of cell void space with simple addition of glass beads, thereby, enabling faster transfer of gases. The cell was also improved by adding a second thermocouple to directly monitor the temperature of the catalyst bed via the outlet port without requiring any additional machining. This modified design and the use of an optical fiber DR probe in conjunction with a miniature concave-CCD combination based spectrometer allowed fast acquisition of in situ UV–vis spectra in the order of seconds and at temperatures up to about 500 °C. It is also shown that, unlike probes used in tubular reactors, expensive high temperature DR probes are not required in this design. The flow dynamics of the reaction setup were followed by an analysis of residence time distributions (RTD) via pulse experiments of Ar, O2, H2, CO, and CO2 as analyzed online by mass spectrometry (MS). These tests enabled a rigorous analysis of the fluid dynamics of the modified cell showing average gas residence times (after correcting for transfer lines and MS contributions) of ∼13 s at gas flow rates of 45 cm3/min (or ∼4 s at gas flow rates of 120 cm3/min) and a fluid behavior that could be approximately described by a CSTR reactor model. The RTD method is of general application and can be easily implemented to other reaction cells to rigorously determine gas mean residence times and distribution, regardless of setup and transfer lines design, provided that a reaction cell bypass line is added to the system. A thermal analysis indicated that significant heat losses due to radiation, conduction, and convection contribute to the observed sample bed vs heater temperature differences. Additionally, an example is presented to show the utility of the modified cell to monitor quickly (every 2 s) and continuously UV–vis spectra over an extended period of time during the in situ dynamic response of gold surface plasmon resonance (Au-SPR) peak shifts on a Au(1 wt%)/ZrO2 catalyst as it is exposed to controlled and cycling oxidizing and reducing environments. The results showed that the Au-SPR peak responded rapidly and shifted reversibly at the studied cyclic oxidizing and reducing conditions. The reported modifications of the reaction cell setup were shown to enable in situ spectroscopic characterization of heterogeneous catalysts. It proved useful for monitoring adsorption and desorption of gas species near gold nanoparticles via Au-SPR and for potentially tracking rapid changes (within seconds) on catalysts with characteristic finger prints in the UV–vis region.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.009
      Issue No: Vol. 561 (2018)
  • Catalytic epoxidation of propylene glycol and its acetates
    • Authors: Arati Santhanakrishnan; Lars Peereboom; Dennis J. Miller
      Pages: 19 - 27
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Arati Santhanakrishnan, Lars Peereboom, Dennis J. Miller
      The base-catalyzed, gas-phase epoxidation of propylene glycol acetates to propylene oxide (PO) is carried out in a laboratory-scale fixed-bed reactor. Potassium salts (0.5–2.5 mmol K/g) on silica are identified as selective catalysts for the reaction. A temperature of 400 °C at high space velocity gives a maximum PO selectivity of 81%, while the maximum yield of 30% is achieved at the same temperature but lower space velocity. Pre- and post-reaction catalysts were characterized by N2 adsorption, TGA, XPS, and FTIR. High temperature and high potassium loading lead to collapse of the silica pore structure, and in severe cases to obstruction of flow in the reactor. Potassium carbonate, formed via ketonization of potassium acetate generated on the support during reaction with KOH as the catalyst material, is the stable potassium species on the catalyst at high loadings (>1.5 mmol K/g silica). At low loadings, surface potassium silicate analogs (Si-O-K) predominate. The use of potassium on a low surface area, annealed silica support gives similar activity and PO selectivity without degradation of pore structure.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.013
      Issue No: Vol. 561 (2018)
  • Investigating time-dependent Zn species over Zn-based catalysts in
           glycerol carbonylation with urea and their roles in the reaction mechanism
    • Authors: Huy Nguyen-Phu; Eun Woo Shin
      Pages: 28 - 40
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Huy Nguyen-Phu, Eun Woo Shin
      In this work, two different Zn-based catalysts – ZnO, and ZnAl mixed oxide (ZnAlO) – were employed to investigate Zn-phase-dependent catalysis in glycerol carbonylation with urea as a function of reaction times. ZnAlO catalyst exhibited higher selectivity and yield of glycerol carbonate (GC) over a wide range of glycerol conversion than the ZnO catalyst. The time-dependent Zn species and reaction intermediates were observed in the solid and liquid phases at various reaction times through FTIR and XRD measurements in order to understand Zn-containing intermediates and corresponding reaction routes over each catalyst. The low GC selectivity in the reaction over the ZnO catalyst was closely connected to the formation of zinc glycerolate (ZnGly) in the solid phase. For the ZnO catalyst, ZnGly was formed in the solid phase even at an initial reaction time by the reaction between Zn NCO complex and glycerol, resulting in the loss of GC selectivity. Alternatively, over a ZnAlO catalyst, the formation of the Zn isocyanate (NCO) complex was dominant up to 2 h of reaction time in both the liquid and solid phases. After 2 h of reaction time, ZnGly was observed in the spent ZnAlO catalyst along with decreasing GC selectivity. The relative formation rates of Zn-containing reaction intermediates (ZnGly and Zn NCO complex) over the ZnAlO catalyst were affected by the Zn phases over the solid catalysts and the ratio of urea to glycerol in the liquid phase during the reaction time.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.016
      Issue No: Vol. 561 (2018)
  • Acid catalysis dominated suppression of xylose hydrogenation with
           increasing yield of 1,2-pentanediol in the acid-metal dual catalyst system
    • Authors: Nailiang Wang; Zhipeng Chen; Licheng Liu
      Pages: 41 - 48
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Nailiang Wang, Zhipeng Chen, Licheng Liu
      One-pot conversion of xylose to 1,2-pentanediol was investigated in a dual catalyst system composed of Ru/C and niobium phosphate as hydrogenation and acid catalysts, respectively. A series of niobium phosphate catalysts well-characterized by XRD, N2 physisorption, FT-IR, NH3-TPD, Py-IR and XPS were tested regarding the effect of their acid properties on product selectivity for the studied process. A systematic study was reported on the effect of reaction conditions. The combined yield of 21–27% to 1,2-pentanediol and its precursor 1-hydroxyl-2-pentanone was accomplished at 423 K under 3.0 Mpa hydrogen pressure in water-γ-valerolactone/cyclohexane biphasic system. At optimized conditions, the correlation between the product yield and the surface Lewis/Brønsted ratio were analyzed. The results revealed that the lower apparent activation energy of xylose dehydration reaction catalyzed by Lewis acid site accounted for the high product selectivity for sugar intermediate and furfural hydrogenation processes, especially for the combined selectivity to 1,2-pentanediol and 1-hydroxyl-2-pentanone. This study lays the grounds for further design of improved solid acid catalysts with high selectivity of 1, 2-pentanediol.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.019
      Issue No: Vol. 561 (2018)
  • Anion-controlled sulfidation for decoration of graphene oxide with iron
           cobalt sulfide for rapid sonochemical dyes removal in the absence of light
    • Authors: Aniruddha Molla; Yuanyuan Li; Mahima Khandelwal; Seung Hyun Hur; Jin Suk Chung
      Pages: 49 - 58
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Aniruddha Molla, Yuanyuan Li, Mahima Khandelwal, Seung Hyun Hur, Jin Suk Chung
      Anion-controlled sulfidation was used to decorate graphene oxide with iron cobalt sulfide via a simple hydrothermal reaction. Anion exchange was carried out using sodium sulfide as an exchanger without any templates or backbone architecture, and in an easy and economical way. Interchange of oxalate, chloride, and hydroxide anions with sulfide anions was performed to tune the morphology of the materials, which subsequently affected their surface area (48.64–83.52 m2/g) and band gap (2.45–2.91 eV). Ultrasonically-cavity-induced degradation activity without light was rapid (1–3 min) for both positive dyes (rhodamine B and methylene blue), a negative dye (methyl orange), and their mixture. Degradation of the dyes and their mixture in the presence of the prepared samples was a pseudo first-order reaction with rate constant value from 0.780 to 1.702 min−1 that followed the sequence FCS@GO-2 > FCS@GO-1 ∼ FCS@GO-3 and MB > RhB > MO for catalyst and dyes, respectively. By using terephthalic acid, it was found that the sono-Fenton process quickly generated reactive oxygen species (ROS) even in absence of light. The ROS production was greater for FCS@GO-2 than FCS@GO-1 or FCS@GO-3, consistent with the catalytic activities of the different catalysts. The prompt production of ROS resulted in a very active process, and the presence of mixed valance states of iron and cobalt resulted in an effective and stable process. It is the synergistic effect of the catalyst that allowed effective breakdown of dyes even in absence of light. The auto-cleaning effect of sonication allowed reuse of the decorated graphene oxide for at least five cycles.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.014
      Issue No: Vol. 561 (2018)
  • Aerobic oxidation of alkylaromatic hydrocarbons to hydroperoxides
           catalysed by N-hydroxyimides in ionic liquids as solvents
    • Authors: Gabriela Dobras; Beata Orlińska
      Pages: 59 - 67
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Gabriela Dobras, Beata Orlińska
      This paper reports studies on the oxidation of alkylaromatic hydrocarbons to hydroperoxides with oxygen in the presence of N-hydroxyimides (N-hydroxyphthalimide, N-hydroxysuccinimide, 4-dodecyloxycarbonyl-N-hydroxyphthalimide, N,N-dihydroxypyromellitimide, N-acetoxyphthalimide) in ionic liquids as solvents. Cumene, ethylbenzene, mono- and di-isopropyl derivatives of naphthalene and biphenyl were used as starting materials. As solvents, ionic liquids composed of 1-alkyl-3-methylimidazolium cations with ethyl, butyl, hexyl or octyl substituents and anions such as [BF4], [PF6], [NTf2], [CF3SO3], [OcOSO3], and [CH3OSO3] were applied. It has been established that organic solvents could be replaced by ionic liquids, which does not accelerate hydroperoxide decomposition and is characterized by relatively high oxygen and catalyst solubility and low viscosity. Among studied ILs, these with [NTf2] and [PF6] anions meet the above requirements.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.012
      Issue No: Vol. 561 (2018)
  • Enhanced dual resistance to alkali metal and phosphate poisoning: Mo
           modifying vanadium-titanate nanotubes SCR catalyst
    • Authors: Penglu Wang; Shan Gao; Haiqiang Wang; Si Chen; Xiongbo Chen; Zhongbiao Wu
      Pages: 68 - 77
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Penglu Wang, Shan Gao, Haiqiang Wang, Si Chen, Xiongbo Chen, Zhongbiao Wu
      The presence of alkali metal and phosphate species significantly deactivate deNO x catalysts. In this work, molybdenum was applied as a key additive for Vanadium-Titanate nanotubes (V-TNTs) catalysts to alleviate the dual poisoning by potassium and phosphate. The addition of Mo improved the resistance of V-TNTs from 70% to >95% in the temperature region of 300–450 °C. The introduction of Mo helped to preserve the redox properties and Brønsted acidic sites of the poisoned catalysts by potassium and phosphate. This behavior mainly resulted from the interaction of Mo with phosphate, followed by the regeneration of active and acidic sites. Moreover, in-situ DRIFTs spectra showed that Mo not only enhanced the NH3 and NO adsorption but also contributed to the activation of adsorbed NO species, making them react with NH3 more easily over Mo-contained catalysts then directly influencing the selective catalytic reduction (SCR) activity as well as dual poisoning resistance. Therefore, supporting materials with abundant acidic sites and appropriate additives can significantly alleviate the dual poisoning by alkali metals and phosphate.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.023
      Issue No: Vol. 561 (2018)
  • Construction of novel Cu/ZnO-Al2O3 composites for furfural hydrogenation:
           The role of Al components
    • Authors: Xiaohai Yang; Qingwei Meng; Guoqiang Ding; Yueqing Wang; Huimin Chen; Yu lei Zhu; Yong Wang Li
      Pages: 78 - 86
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Xiaohai Yang, Qingwei Meng, Guoqiang Ding, Yueqing Wang, Huimin Chen, Yu lei Zhu, Yong Wang Li
      Novel Cu/ZnO-Al2O3 composites had been constructed and applied in furfural hydrogenation to produce furfuryl alcohol in a fixed-bed reactor. As the result, conversion of FFA over Cu/ZnO catalyst (within 16–24 h TOS) could be improved from 84.9% to 98.0% at 120 °C and 51.4% to 72.1% at 100 °C with a high selectivity of FOL (≈98%) over the novelly constructed Cu/ZnO-Al2O3 catalyst. The role of Al components derived from different precursors like Al(NO3)3, as-prepared Al(OH)3 and pseudo-boehmite had been systemically investigated by various techniques such as XRD, Raman spectroscopy, H2-TPR, N2O titration, XPS, AES experiments and confirmed to be both improving dispersion of copper/zinc species and hindering Cu-ZnO interaction of the aurichalcite derived catalysts. Preparation of the industrial Cu/ZnO-Al2O3 catalysts had been revealed and explained more clearly.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.005
      Issue No: Vol. 561 (2018)
  • Cost effective and energy efficient catalytic support of Co and Ni in Pd
           matrix toward ethanol oxidation reaction: Product analysis and mechanistic
    • Authors: Achintya Mondal; Abhishek De; Jayati Datta
      Pages: 87 - 95
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Achintya Mondal, Abhishek De, Jayati Datta
      The present investigation deals with the comparative analysis of electro-catalytic behaviour of Pt, Pd and ternary combinations of Co and Ni with Pd NPs, supported on vulcan XC72 as the anode component in direct ethanol fuel cell (DEFC) operating in alkaline environment. Catalyst NPs were synthesized by ethylene glycol reduction method and their structure, composition and surface morphology were determined through XRD, EDAX and TEM techniques. The superb catalytic efficiency of PdCoNi/C toward ethanol oxidation reaction (EOR) is ascribed to the catalytic intervention of transition metal ad atoms and their surface oxides, culminating to enhanced electrochemical surface area, preferred OH− adsorption on the surface and remarkable yield of oxidation products (CH3CO2 − and CO3 2 −) estimated by ion chromatography. The performance output parameters collectively substantiate not only to the catalytic superiority of the PdCoNi/C catalyst but also affordability to a considerable extent over both the Pt/C and Pd/C catalysts.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.015
      Issue No: Vol. 561 (2018)
  • Catalytic properties of PdZn/ZnO in formic acid decomposition for hydrogen
    • Authors: Dmitri A. Bulushev; Monika Zacharska; Sergey Beloshapkin; Yina Guo; Igor Yuranov
      Pages: 96 - 103
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Dmitri A. Bulushev, Monika Zacharska, Sergey Beloshapkin, Yina Guo, Igor Yuranov
      This is one of the first reports, which is related to hydrogen production through formic acid decomposition over Pd/ZnO catalysts widely used for methanol steam-reforming. These catalysts have been investigated in comparison with Pt/ZnO and Pd/Al2O3 catalysts as well as ZnO support. HAADF/STEM, XRD, XPS and DRIFTS in situ studies of the systems were performed. The measured catalyst activity corresponds to the following order: Pd/Al2O3≥Pd/ZnO > Pt/ZnO > ZnO. Among the studied catalysts, Pd/ZnO showed the highest selectivity to hydrogen (up to 99.3%). This was assigned to the formation of a PdZn alloy during the reductive pre-treatment of the catalyst. An increase of the pre-treatment temperature from 573 to 773 K led to a significant increase of the mean PdZn (PtZn) nanoparticle size. However, the catalyst activity did not change, but the selectivity to hydrogen increased. These features closely remind the behavior of Pd/ZnO catalysts in methanol steam reforming implying that the mechanism of formic acid decomposition involves the same key steps and active sites.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.025
      Issue No: Vol. 561 (2018)
  • The primary stages of polyoxomolybdate catalyzed cyclohexanone oxidation
           by hydrogen peroxide as investigated by in situ NMR. Substrate activation
           and evolution of the working catalyst
    • Authors: Dahbia Amitouche; Mohamed Haouas; Tassadit Mazari; Sihem Mouanni; Romain Canioni; Chérifa Rabia; Emmanuel Cadot; Catherine Marchal-Roch
      Pages: 104 - 116
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Dahbia Amitouche, Mohamed Haouas, Tassadit Mazari, Sihem Mouanni, Romain Canioni, Chérifa Rabia, Emmanuel Cadot, Catherine Marchal-Roch
      The catalytic process of cyclohexanone oxidation by hydrogen peroxide was investigated using in situ NMR spectroscopy in real working conditions. The behavior of the Keggin heteropolyacid H3PMo12O40, used as a model catalyst, was explored before and after adding the oxidant agent. This study revealed the evolution pathways to different reduced states of H3PMo12O40 and its reversible transformation into peroxomolybdate complexes. These latter were identified as the active species for the adipic acid formation, while the acid function of the catalyst was found important for the substrate activation via ketonic-enolic tautomerism. The oxidative mechanism of the cyclohexanone was described through three successive steps to produce adipic acid.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.017
      Issue No: Vol. 561 (2018)
  • Efficient conversion of furfural into cyclopentanone over high performing
           and stable Cu/ZrO2 catalysts
    • Authors: Yifeng Zhang; Guoli Fan; Lan Yang; Feng Li
      Pages: 117 - 126
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Yifeng Zhang, Guoli Fan, Lan Yang, Feng Li
      Currently, biomass transformation to produce high value-added chemicals and liquid biofuels is attracting more and more interest by the virtue of its importance in the sustainable development of human society. Herein, we reported the conversion of furfural (FFA) into cyclopentanone (CPO) in water over high performing and stable Cu/ZrO2 catalysts prepared by our developed one-pot reduction-oxidation method. It was demonstrated that surface structures and catalytic performances of catalysts could be delicately adjusted by varying the calcination temperatures for catalyst precursors. Especially, an appropriate calcination temperature of 500 °C could significantly enhance the interactions between surface Cu species and the ZrO2 support, thus greatly facilitating the formation of Cu+-O-Zr-like structure at the metal-support interface, and the resulting Cu/ZrO2 catalyst showed a superior catalytic performance with a high CPO yield of 91.3% under mild reaction conditions (i.e. a low hydrogen pressure of 1.5 MPa and 150 °C) to other metal oxides supported copper catalysts prepared by the conventional impregnation. It was revealed that in addition to surface acidic sites, surface Cu+/(Cu°+Cu+) ratio also played a key role in promoting the formation of CPO in the present Cu/ZrO2 catalytic system.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.030
      Issue No: Vol. 561 (2018)
  • One-pot synthesized CePO4/Ni2P nanocomposites as general hydrogenation
           catalysts: The attractive contribution of CePO4
    • Authors: Jing-Jing Shi; Hui-Juan Feng; Chang-Lin Qv; Dan Zhao; San-Guo Hong; Ning Zhang
      Pages: 127 - 136
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Jing-Jing Shi, Hui-Juan Feng, Chang-Lin Qv, Dan Zhao, San-Guo Hong, Ning Zhang
      Cheap and robust compounds that can replace precious metal (PM) catalysts are eagerly anticipated for hydrogen-involved chemical transformations. Herein, Ce3+ and Ni2+ were co-bonded by HPO4 2− in a one-pot solvothermal synthesis system; then, the obtained precipitates were thermal-treated to obtain a series of Ce-Ni-P samples. With characterizations of XRD, XPS, SEM and HRTEM, the samples were featured as nanocomposites and as closely contacted CePO4 and Ni2P particles in both ca. 10.0–40.0 nm. Hydrogen adsorption-activation properties comparable to those of precious metals were discovered on the CePO4 component (H2-TPD), making a main contribution in achieving the superior TOF of 0.06-0.51 s−1 for hydrogenation of cinnamaldehyde (CAL) to hydrocinnamaldehyde (HCAL), with 92–99% selectivity on (CePO4) m /Ni2P nanocomposites (with molar ratio m of 0.12–4.6). The function of Ni2P was shown to activate CAL (CAL-TPD); then, a Langmuir–Hinshelwood mechanism was proposed and uncovered from the kinetic measurements. Superior catalytic hydrogenation performances were represented for two phenyl-alkynes and ten other α, β-unsaturated carbonyl compounds, further indicating that CePO4/Ni2P nanocomposites serve as general hydrogenation catalysts; the features of low cost, robust structure and comparable properties to PM in both hydrogen activation and hydrogenation activity provide these nanocomposites with the potential to be PM substitutes for boosting correlating hydrogen-involved applications.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.028
      Issue No: Vol. 561 (2018)
  • Hydrodeoxygenation of vanillin over carbon supported metal catalysts
    • Authors: J.L. Santos; M. Alda-Onggar; V. Fedorov; M. Peurla; K. Eränen; P. Mäki-Arvela; M.Á. Centeno; D. Yu. Murzin
      Pages: 137 - 149
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): J.L. Santos, M. Alda-Onggar, V. Fedorov, M. Peurla, K. Eränen, P. Mäki-Arvela, M.Á. Centeno, D. Yu. Murzin
      Different carbon supported metal catalysts were synthesized, and characterized with various physico-chemical methods and tested in vanillin hydrodeoxygenation under 30 bar total pressure in water as a solvent at 100 °C. The catalysts exhibited high specific surface area and the metal dispersion decreased in following order: Pt/C > Pd/C > Au/C > Rh/C > Ru/C. The most active catalyst was Pd/C followed by Ru/C. Vanillin hydrodeoxygenation proceeded via hydrogenation forming vanillyl alcohol further to its hydrogenolysis forming p-creosol. Both hydrogenation and hydrogenolysis were promoted by Pd/C, which exhibited rather high dispersion. The highest selectivity to p-creosol, 95% at complete vanillin conversion, was obtained with Pd/C. Kinetic modelling of vanillyl alcohol selectivity as a function of vanillin conversion was performed.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.010
      Issue No: Vol. 561 (2018)
  • Stability of gold nanocatalysts supported on mesoporous silica for the
           oxidation of 5-hydroxymethyl furfural to furan-2,5-dicarboxylic acid
    • Authors: Nazila Masoud; Baira Donoeva; Petra E. de Jongh
      Pages: 150 - 157
      Abstract: Publication date: 5 July 2018
      Source:Applied Catalysis A: General, Volume 561
      Author(s): Nazila Masoud, Baira Donoeva, Petra E. de Jongh
      The synthesis of furan-2,5-dicarboxylic acid via catalytic oxidation of 5-hydroxymethyl furfural is an important step for the production of bio-sourced polymers. We report on the activity of SiO2-supported Au catalysts for this reaction. These catalysts reached 74% furan-2,5-dicarboxylic acid yield at 90 °C in 5 h when 5-hydroxymethyl furfural to Au molar ratio was 72. We also investigated the influence of the morphologies of the silica supports on the growth of Au nanoparticles under reaction conditions. Pronounced growth of Au nanoparticles occurred on Aerosil, SiO2 with a disordered porosity and 50 nm average pore diameter: Au nanoparticles grew from 2.4 to 10.1 nm. However, by using ordered mesoporous supports, the growth of the gold nanoparticles was successfully minimized. Also the reaction conditions influenced the particle growth; for instance using HCO3 − as a base led to more pronounced particle growth than using NaOH. Particle diffusion in solution, and subsequent coalescence and agglomeration was proposed to be the dominant particle growth mechanism. Our results show the importance of support morphology in mitigation of Au particle growth in liquid phase oxidation reactions.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.027
      Issue No: Vol. 561 (2018)
  • Coprecipitated-like hydrotalcite-derived coatings on open-cell metallic
           foams by electrodeposition: Rh nanoparticles on oxide layers stable under
           harsh reaction conditions
    • Authors: Phuoc Hoang Ho; Wout de Nolf; Francesca Ospitali; Angela Gondolini; Giuseppe Fornasari; Erika Scavetta; Domenica Tonelli; Angelo Vaccari; Patricia Benito
      Pages: 12 - 20
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Phuoc Hoang Ho, Wout de Nolf, Francesca Ospitali, Angela Gondolini, Giuseppe Fornasari, Erika Scavetta, Domenica Tonelli, Angelo Vaccari, Patricia Benito
      Structured catalysts based on open-cell metallic foams coated by a catalytic film offer a great potential for intensification and optimization of catalytic processes. Here, we demonstrated the feasibility of the electrodeposition to synthesize in situ and quick Rh/Mg/Al hydrotalcite-type (HT) syngas catalyst precursors with controlled composition, morphology and thickness around 5 to 20 μm on the surface of FeCrAlloy foams using a two-compartment flow electrochemical cell. After calcination at 900 °C, catalytic coatings with properties similar to those of conventional co-precipitated HT-derived catalysts were identified by synchrotron nano-XRF/XRD tomography and HRTEM. The resulting structured catalysts, therefore, merged the properties of both HT-derived catalysts and open-cell foams, namely, thermally stable nano MgO- and spinel-type phases where Rh was dispersed and stabilized against sintering, and high mass and heat transfer. Moreover, the development of a MgAl2O4 thin film in the support-coating interface, by chemical reaction between Mg2+ from the coating and Al3+ from the support during calcination, increased the catalyst adhesion. Consequently, active and stable performance was obtained under harsh reaction conditions in the catalytic partial oxidation of CH4 to syngas as a model reaction. Even in the catalysts operating under severe reaction conditions for about 50 h, the coating was stable and Rh metallic nanoparticles around 2 nm were still well dispersed.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.014
      Issue No: Vol. 560 (2018)
  • Polyhedral oligomeric silsesquioxane-conjugated
           bis(diphenylphosphino)amine ligand for chromium(III) catalyzed ethylene
           trimerization and tetramerization
    • Authors: Hoseong Lee; Soon Hyeok Hong
      Pages: 21 - 27
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Hoseong Lee, Soon Hyeok Hong
      Polyhedral oligomeric silsesquioxanes (POSSs) were attached to conventional bis(diphenylphosphino)amine (PNP) ligand as solubility-enhancing materials for catalytic ethylene trimerization and tetramerization. Differently functionalized arylphosphine ligands of the type (Ph)2PN(POSS)P(Ph)(ArR) (R = functional groups) were systematically developed, and their corresponding chromium(III) complexes were formed. The developed precatalysts exhibited excellent tolerance in solvents, including even low-carbon-number hydrocarbons such as n-pentane, n-hexane, or cyclohexane. In particular, the ortho-fluorophenyl-substituted complex showed higher stability even at higher temperatures above 120 °C. The ortho-OCF3–phenyl-substituted complex showed outstanding catalytic activity, which reached 2287 kg/g Cr/h at 30 bar.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.030
      Issue No: Vol. 560 (2018)
  • Crucial role of support in glucose selective conversion into
           1,2-propanediol and ethylene glycol over Ni-based catalysts: A combined
           experimental and computational study
    • Authors: Zhichao Tan; Lei Shi; Yifan Zan; Gai Miao; Shenglin Li; Lingzhao Kong; Shengang Li; Yuhan Sun
      Pages: 28 - 36
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Zhichao Tan, Lei Shi, Yifan Zan, Gai Miao, Shenglin Li, Lingzhao Kong, Shengang Li, Yuhan Sun
      Selective hydrogenation of glucose into 1,2-propanediol (1,2-PDO) and ethylene glycol (EG) over supported Ni catalysts were investigated by 13C NMR, XRD, TEM, and EDS, as well as first principles calculations to reveal the significant role of the support on the catalytic mechanism and the product selectivity. Our experiment shows that the MgO support facilitates the conversion of glucose into fructose and the retro-aldol reaction of fructose at the C3-C4 position to form C3 products. Density functional theory studies of the MgO support effect on the retro-aldol reactions of fructose and glucose indicate that the formation of C3 products is preferred with lower energy barrier, consistent with our experimental observation. Possible reactions occurred during the hydrogenation of glucose over MgO and ZnO supported Ni catalysts were discussed based on this combined experimental and computational study.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.026
      Issue No: Vol. 560 (2018)
  • Highly active and recyclable Pt nanocatalyst for hydrogenation of
           quinolines and isoquinolines
    • Authors: Xiuru Xue; Min Zeng; Yanhua Wang
      Pages: 37 - 41
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Xiuru Xue, Min Zeng, Yanhua Wang
      Thermoregulated phase-transfer Pt nanocatalyst was shown to be highly active, selective and recyclable in the hydrogenation of quinolines and isoquinolines. The catalyst could be easily separated from the product by simple phase separation and directly reused in the next cycle without evident loss in catalytic activity and selectivity, even after ten recycles. Importantly, for quinoline, the TON of 10,474 is the highest value ever reported among Pt catalysts. More remarkably, for isoquinoline, the TON of 5340 is far ahead of the highest record among transition metal catalysts.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.039
      Issue No: Vol. 560 (2018)
  • Development of highly selective PdZn/CeO2 and Ca-doped PdZn/CeO2 catalysts
           for methanol synthesis from CO2 hydrogenation
    • Authors: Ali Shan Malik; Sharif F. Zaman; Abdulrahim A. Al-Zahrani; Muhammad A. Daous; Hafedh Driss; Lachezar A. Petrov
      Pages: 42 - 53
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Ali Shan Malik, Sharif F. Zaman, Abdulrahim A. Al-Zahrani, Muhammad A. Daous, Hafedh Driss, Lachezar A. Petrov
      Effect of Pd, Zn, PdZn alloy and Ca-doped PdZn on CeO2 for CO2 hydrogenation to methanol was investigated. CeO2-supported PdZn and Ca-doped PdZn nanoparticles (NPs) proved to be highly selective, fairly active and quite stable for CH3OH synthesis at reasonably low temperature conditions. In the case of Ca-doped PdZn/ CeO2, methanol selectivity of ∼100% was achieved at low temperature (T  = 220 °C, P  = 30 bar and GHSV = 2400 mL g−1h−1) with reasonable CO2 conversion (7.7%). CeO2-supported PdZn nanoparticles (NPs) (3–6 nm, measured from HR-TEM) were successfully prepared by the chelating method using citric acid as a chelating agent. The developed catalysts were investigated using a range of characterization techniques (BET, CO-Chemisorption, CO2-TPD, H2-TPR, XRD, XPS, STEM-EDS and HR-TEM). XPS results revealed the presence of Ce+3 ions implying the generation of oxygen-vacant sites over the surface of CeO2-supported catalysts which aided in increased CO2 dissociation resulting in higher methanol rates. An in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) study was also carried out for the best performing catalyst at actual reaction conditions to determine the intermediate species and a probable reaction mechanism. Characterization results revealed the significance of CeO2 interaction with PdZn nanoparticles for selective CH3OH formation over ceria-supported PdZn nanoparticles. Addition of Ca, to the CeO2-supported PdZn catalysts, as a promoter, slightly improved the selective conversion of CO2 to methanol by raising the amount of oxygen-vacant sites as revealed by XPS results. DRIFT studies revealed the emergence of monodentate, bidentate formates, CH2O and methoxy species and their subsequent conversion to methanol and CO, steering the reaction mechanism towards formate route for selective formation of methanol.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.036
      Issue No: Vol. 560 (2018)
  • Synthesis of cinnamyl benzoate over novel heteropoly acid encapsulated
    • Authors: Radhika S. Malkar; Ganapati D. Yadav
      Pages: 54 - 65
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Radhika S. Malkar, Ganapati D. Yadav
      ZIF-8 is a zeolitic imidazolate framework which is a subclass of metal organic framework (MOF). ZIF-8 is the emerging class of MOF with various applications. Dodecatungstophosphoric acid (DTP) encapsulated ZIF-8 was prepared first time using bottle around the ship strategy. This approach covers ZIF-8 synthesis along with DTP encapsulation in one pot synthesis. The synthesized catalyst shows highest catalytic activity for esterification reaction of benzoic anhydride with cinnamyl alcohol to form cinnamyl benzoate. Heterogeneous catalytic synthesis of cinnamyl benzoate with complete reaction kinetics is presented here for the first time. Cinnamyl benzoate is a famous perfumery and flavoring agent and GRAS listed food additive molecule. Catalyst preparation method is simple, rapid and can be done at room temperature using water as a solvent. DTP@ZIF-8 shows sodalite like structure and it was confirmed by applying several characterization techniques like SEM, TEM, XRD, BET, FTIR, TGA and ammonia-TPD. Duration of DTP@ZIF-8 crystal formation was studied and optimized up to 12 h. Catalyst is thermally stable up to 400 °C and showed reusability for 3 cycles. Reaction kinetics was studied with best fit of Eley-Rideal mechanism.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.038
      Issue No: Vol. 560 (2018)
  • On the role of oxocarbenium ions formed in Brønsted acidic condition on
           γ-Al2O3 surface in the ring-opening of γ-valerolactone
    • Authors: Tuhin Suvra Khan; Shelaka Gupta; Prasad Bandodkar; Md. Imteyaz Alam; M. Ali Haider
      Pages: 66 - 72
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Tuhin Suvra Khan, Shelaka Gupta, Prasad Bandodkar, Md. Imteyaz Alam, M. Ali Haider
      The ring-opening and decarboxylation reaction of γ-valerolactone (GVL), yielding a mixture of butene isomers, constitutes an important transformative step for the upgradation of biomass-derived precursors into high value fuels and chemicals. In this study, density functional theory (DFT) simulations were utilized to gain insights into the ring-opening of GVL in presence of Brønsted acid promoted γ-Al2O3 catalyst. DFT simulations suggested towards the formation of stable oxocarbenium ion of GVL on the γ- Al2O3 surface via a proton transfer to the carbonyl oxygen in presence of the Brønsted acid. The surface oxygen atoms of γ-Al2O3 were observed to show high affinity for H-abstraction from the oxocarbenium ion to yield the carbenium ion intermediate, which subsequently gave the product butene via a combination of hydride transfer and decarboxylation steps. Higher reactivity of the Brønsted acid promoted γ-Al2O3 surface, was attributed to the direct ring-opening (Ea = 13 kJ/mol) of the surface adsorbed oxocarbenium ion of GVL, leading to the formation of the γ-carbenium ion, which was unlikely to form with the adsorbed GVL structure. In addition, H-abstraction by the surface oxygen from the C5 of adsorbed oxocarbenium ion (Ea = 13 kJ/mol) was calculated to be of lower activation barrier as compared to the H-abstraction from C5 of the adsorbed GVL (Ea = 40 kJ/mol), which may also lead to facile ring-opening in presence of a Brønsted acid on γ-Al2O3.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.035
      Issue No: Vol. 560 (2018)
  • The aminocarbonylation of 1,2-diiodoarenes with primary and secondary
           amines catalyzed by palladium complexes with imidazole ligands
    • Authors: Przemysław Wójcik; Anna M. Trzeciak
      Pages: 73 - 83
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Przemysław Wójcik, Anna M. Trzeciak
      The efficient carbonylative cyclization of 1,2-diiodobenzene with different primary and secondary amines was performed using a palladium complex with an imidazole ligand, PdCl2(BIM)2, as a catalyst. In reactions performed at 1 atm of CO with primary amines, phthalimides were obtained as the only products with yields of up to 100% in 4 h. An even shorter time, 1 h, was sufficient to obtain the same products employing methyl-2-iodobenzoate as a substrate instead of 1,2-diiodobenzene. In an analogous reaction with secondary amines, 1,2-diiodobenzene was converted to three products, formed in amounts dependent on the reaction conditions. The presence of Pd NPs and soluble palladium intermediates indicated their participation in the catalytic reaction.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.043
      Issue No: Vol. 560 (2018)
  • Magnetic separation and high reusability of chloroperoxidase entrapped in
           multi polysaccharide micro-supports
    • Authors: Sonia García-Embid; Francesca Di Renzo; Laura De Matteis; Nicoletta Spreti; Jesús M. de la Fuente
      Pages: 94 - 102
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Sonia García-Embid, Francesca Di Renzo, Laura De Matteis, Nicoletta Spreti, Jesús M. de la Fuente
      Enzyme immobilization on magnetic supports represents a great advantage for the industrial application of enzymatic catalysis since it allows an easy recovery of the catalyst, avoiding any contamination of the product by residual enzyme. Iron oxide nanoparticles are very useful for this purpose. Using a polymer to diminish the interaction between the magnetic cores themselves, can improve the colloidal stability of the support and prevent any interaction with the environment that would affect both support properties and enzyme stability. For this reason, in this work different magnetic micro-supports, based on polydopamine-coated iron oxide nanoparticles with a multi polysaccharide shell, have been developed. These supports have been used to immobilize chloroperoxidase, a very interesting enzyme, able to catalyze many reactions of large-scale interest, but whose application is limited by its sensitivity to reaction conditions. The multi polysaccharide shells of the supports were obtained through a combination of chitosan and alginate. An in-depth analysis of physicochemical and catalytic properties of all the developed magnetic supports is reported. CPO was successfully immobilized with an efficiency of entrapment between 92% and 100% in the case of supports with chitosan in the interior or outer shell respectively. A very good chemical stability of the support under reaction conditions was observed in the case of an interior shell of alginate and an outer coating of chitosan, together with an excellent reusability of the immobilized enzyme, that was recycled to catalyze up to 25 consecutive reaction cycles.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.029
      Issue No: Vol. 560 (2018)
  • Synthesis of Co-Fe-Pd nanoparticles via ultrasonic irradiation and their
           electro-catalytic activity for oxygen reduction reaction
    • Authors: huihua Wang; Channa Wang; ling Liu; Tianpeng Qu; Deyong Wang; Zhenhui Kang
      Pages: 103 - 110
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): huihua Wang, Channa Wang, ling Liu, Tianpeng Qu, Deyong Wang, Zhenhui Kang
      Metal nanoparticles, namely Co, Co5Fe2, Co5Pd1 and Co5Fe2Pd1, were successfully synthesized by applying an ultrasonic irradiation method, and their electro-catalytic activities toward ORR were also evaluated in 0.1 M KOH solution. Co5Fe2Pd1 nanoparticles with an average diameter of 3 to 5 nm were found mostly in the metallic state. Due to the trimetallic microalloying effect, Co5Fe2Pd1 nanoparticles exhibited higher ORR activity than those of Co, Co5Fe2 and Co5Pd1 nanoparticles, even higher than that of commercial Pt/C catalyst. Also, Co5Fe2Pd1 nanoparticles were more tolerant than commercial Pt/C catalyst to the poisoning effect of methanol, whereas on them the ORR proceeded predominately via the four-electron pathway. The concentration of citric acid was also found to affect the size distribution of the Co5Fe2Pd1 nanoparticles, and thus influenced their electro-catalytic activities for ORR.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.034
      Issue No: Vol. 560 (2018)
  • Meervein-Ponndorf-Vereley reduction of carbonyl compounds in monolithic
           siliceous microreactors doped with Lewis acid centres
    • Authors: Agnieszka Ciemięga; Katarzyna Maresz; Julita Mrowiec-Białoń
      Pages: 111 - 118
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Agnieszka Ciemięga, Katarzyna Maresz, Julita Mrowiec-Białoń
      Meerwein-Ponndorf-Vereley chemoselective reduction of cyclohexanone and benzaldehyde was studied in monolithic continuous-flow microreactors, with various Lewis acid centres derived from different metal precursors, i.e. metal alkoxides, chelated metal alkoxides and salts. The productivities achieved in the microreactors, doped with metal centres terminated by propoxy ligands, were significantly higher, ca. 30%, than those obtained for oxides modified monoliths. The highest efficiency of Zr-doped microreactors was proved and their superiority over aluminium and titanium functionalized ones was demonstrated. Higher efficiency of microreactors compared to batch reactors with powdered catalysts has been shown. Stability of proposed materials has been demonstrated. The catalytic outcomes were correlated with structural and physicochemical properties of materials, obtained using low-temperature nitrogen adsorption, mercury porosimetry, SEM microscopy, ICP-MS, FTIR study and pyridine adsorption.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.037
      Issue No: Vol. 560 (2018)
  • Efficient solid acid catalysts based on sulfated tin oxides for liquid
           phase esterification of levulinic acid with ethanol
    • Authors: Margarita Popova; Pavletta Shestakova; Hristina Lazarova; Momtchil Dimitrov; Daniela Kovacheva; Agnes Szegedi; Gregor Mali; Venkata Dasireddy; Blaž Likozar; Nicole Wilde; Roger Gläser
      Pages: 119 - 131
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Margarita Popova, Pavletta Shestakova, Hristina Lazarova, Momtchil Dimitrov, Daniela Kovacheva, Agnes Szegedi, Gregor Mali, Venkata Dasireddy, Blaž Likozar, Nicole Wilde, Roger Gläser
      Tin oxide nanomaterials prepared by hydrothermal synthesis at 100 °C or 140 °C with or without template and further calcination step were modified with sulfate groups by post synthesis treatment. The catalysts were characterized by X-ray powder diffraction (XRD), N2 physisorption, UV Vis spectroscopy, TG analysis, XPS and solid state NMR spectroscopy. The acidity of the materials was characterized by temperature programmed desorption (TPD) of ammonia. The catalytic performance of nanosized SnO2 catalysts and their sulfated analogues was studied in levulinic acid (LA) esterification with ethanol. Sulfated materials show significantly higher activity compared to non-sulfated ones. It was found that the synthesis parameters (temperature, template) for preparation of the parent SnO2 nanoparticles influence significantly their textural properties and have a pronounced effect on the structural characteristics of the obtained sulfated tin oxide based materials and their catalytic performance in levulinic acid esterification. Skipping the calcination step during the preparation of parent SnO2 samples synthesized without template resulted in the formation of new, highly crystalline phase based on hydrated tin(IV) sulfate [Sn(SO4)2.xH2O], tin(IV) bisulfate [Sn(HSO4)4.xH2O] and/or tin(IV) pyrosulfate [Sn(S2O7).xH2O] species in the sulfated nanomaterials with superior catalytic performance. The formation of this new and catalytically very active phase not reported so far in the literature for sulfated tin oxide-based materials is discussed. The catalytically active sites for esterification of levulinic acid with ethanol is suggested to result from the formation of strong Brønsted and Lewis acid sites with high density in the newly registered phase. The results indicate that the chemical structure and catalytic performance of the obtained sulfated tin oxide based materials strongly depend on the treatment of the SnO2 nanoparticles before the sulfation procedure.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.041
      Issue No: Vol. 560 (2018)
  • Stilbene synthesis through decarboxylative cross-coupling of substituted
           cinnamic acids with aryl halides
    • Authors: Nelly Rameau; Baptiste Russo; Stéphane Mangematin; Catherine Pinel; Laurent Djakovitch
      Pages: 132 - 143
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Nelly Rameau, Baptiste Russo, Stéphane Mangematin, Catherine Pinel, Laurent Djakovitch
      The Pd-catalyzed decarboxylative cross-coupling reaction between cinnamic acid and aryl iodide derivatives was studied using both homogeneous and heterogeneous Pd-catalysts. It was demonstrated that simple Pd(OAc)2 can catalyze this reaction with useful to high yields when engaging ferulic acid whatever the nature of the aryl iodide. However, limitations were found when varying the nature of the cinnamic acid derivatives mainly due to low decarboxylation process. This could be overcome in some cases by adding Cu(OH)2/1,10-phenantroline as co-catalyst. In the presence of heterogeneous catalysts, the studies showed that both Pd/C and home-made Pd/SiO2 catalysts afforded high product yields; however, while less active it was demonstrated that the Pd/SiO2 catalyst could be reused over at least 4 cycles due to higher stability.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.031
      Issue No: Vol. 560 (2018)
  • Fischer-Tropsch synthesis: Effect of CO conversion on CH4 and oxygenate
           selectivities over precipitated Fe-K catalysts
    • Authors: Wenping Ma; Wilson D. Shafer; Gary Jacobs; Jia Yang; Dennis E. Sparks; Hussein H. Hamdeh; Burtron H. Davis
      Pages: 144 - 152
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Wenping Ma, Wilson D. Shafer, Gary Jacobs, Jia Yang, Dennis E. Sparks, Hussein H. Hamdeh, Burtron H. Davis
      The explanation for CH4 selectivity for iron based Fischer-Tropsch catalysts in the low conversion region (i.e., <50%) remains elusive. In this contribution, the CO conversion effect was carefully examined over four K promoted Fe catalysts (100 Fe/5.1Si/2Cu/ x K, where x = 1–5) over a wide range of CO conversion (i.e., 4–85%). Moreover, the effect of CO conversion on oxygenate selectivity of the Fe-K catalysts was carefully studied as well. The change in CH4 selectivity with CO conversion was found to resemble asymmetric “V” shaped curves, with the minimum values occurring at approximately 50% CO conversion. Adding greater than x  = 2 K significantly alleviated the CO conversion effect which was attributed to the high K loading greatly decreasing the surface H coverage while improving CO adsorption. The unique CH4 selectivity trend suggests a complicated CH4 formation process that results from different aspects of the catalyst (i.e., chain growth and hydrogenation rates), and process conditions. Oxygenate selectivity was in the range of 0.7–2.8% and varied with the CO conversion and K loading. The addition of K up to x  = 3 was found to promote oxygenate formation and chain growth. The overall oxygenate distribution up to C17 follows an Anderson-Schulz Flory (ASF) distribution, with ethanol being the dominant oxygenate. Mechanisms of oxygenate formation different from that of hydrocarbon formation (e.g., CO insertion versus CO dissociation) were proposed to explain the experimental results.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.042
      Issue No: Vol. 560 (2018)
  • New insights into the promotional mechanism of ceria for activity and
           ammonium bisulfate resistance over V/WTi catalyst for selective catalytic
           reduction of NO with NH3
    • Authors: Chenxu Li; Meiqing Shen; Jianqiang Wang; Jun Wang; Yanping Zhai
      Pages: 153 - 164
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Chenxu Li, Meiqing Shen, Jianqiang Wang, Jun Wang, Yanping Zhai
      The promotion of Ce-doped V/WTi for NH3-SCR performance and ammonium bisulfate (ABS) resistance is fully illustrated. The V2O5/CeO2/WTi-2 presents an excellent NOx conversion at 280 °C in the presence of 1000 ppm SO2.The introduction of ceria contributes to the vanadia species agglomeration into the oligomeric V-O-V structures and tight connects with the adjacent vanadium species to form the redox structure of Ce4+-O-Ce3+-O-V5+-O-V5+-O-Ce3+-O-Ce4+, which facilitates the electronic conduction between ceria and vanadia species. The electronic interaction via the redox structure promotes the activation of ammonia adsorbed on vanadia and nitrate species on ceria, which lowers the apparent activation energies (Ea) and significantly improves the NOx conversion rate. The addition of ceria protects active V sites poisoning and improves the stability of the adsorbed NOx species, which prevents VOSO4 formation and competitively inhibits the adsorption of SO2 with less metal sulfate formation on ceria. In addition, the electrons donating from vanadia to ceria species via the redox structure could make ceria species existing in electron enrichment state and boost the electrons around ceria deviating towards sulfates and strengthen the bonding between ceria and as-formed ABS species, which weakens the stability of ABS and promotes to initiate NH3-SCR reaction between the NH4 + species of ABS and NO+O2. The faster NH3-SCR conversion rate promoted by the redox structure further suppresses the competitive reaction between sulfate and ammonia species, which results in no ABS formation over V/Ce/WTi-2.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.005
      Issue No: Vol. 560 (2018)
  • Selective synthesis of dimethyl ether on eco-friendly K10 montmorillonite
    • Authors: Ali M. Bahmanpour; Florent Héroguel; Christophe J. Baranowski; Jeremy S. Luterbacher; Oliver Kröcher
      Pages: 165 - 170
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Ali M. Bahmanpour, Florent Héroguel, Christophe J. Baranowski, Jeremy S. Luterbacher, Oliver Kröcher
      The methanol dehydration reaction was studied over environmentally benign, easily accessible and inexpensive K10 montmorillonite clay used as the catalyst at a temperature range between 200–700 °C. Nearly 100% selectivity towards dimethyl ether (DME) at 80% methanol conversion was observed at 300 °C. However, upon heating, the selectivity shifted and the catalyst produced formaldehyde as well as an almost 1:1 M ratio of methane and carbon monoxide at 700 °C. Calcination at 300 °C increased the catalyst acidity due to desorption of chemisorbed water, thereby enhancing the methanol conversion to form DME. Higher calcination temperatures negatively affected the catalyst structure and, therefore, its activity. Catalyst characterization by means of X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), and solid-state Nuclear Magnetic Resonance (MAS NMR) spectroscopy, revealed that the calcination temperature affected the near surface Si/Al ratio as well as the surface hydroxyl groups. It was concluded that the density of the surface Brønsted acid sites is directly proportional to methanol conversion to DME.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.006
      Issue No: Vol. 560 (2018)
  • Stereospecific sp3 C–H oxidation with m-CPBA: A CoIII Schiff base
           complex as pre-catalyst vs. its CoIIICdII heterometallic derivative
    • Authors: Oksana V. Nesterova; Katerina V. Kasyanova; Valeriya G. Makhankova; Vladimir N. Kokozay; Olga Yu. Vassilyeva; Brian W. Skelton; Dmytro S. Nesterov; Armando J.L. Pombeiro
      Pages: 171 - 184
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Oksana V. Nesterova, Katerina V. Kasyanova, Valeriya G. Makhankova, Vladimir N. Kokozay, Olga Yu. Vassilyeva, Brian W. Skelton, Dmytro S. Nesterov, Armando J.L. Pombeiro
      The mono- and binuclear Schiff base complexes [CoL3]·DMF (1) and [CoCdL3Cl2]·0.5H2O (2) were facilely synthesized using zerovalent cobalt and cadmium chloride (for 2) as starting materials and the pre-formed pro-ligand HL (2-methoxy-6-[(methylimino)methyl]phenol, the product of condensation of o-vanillin and methylamine) in air. The compounds were characterized by single crystal X-ray diffraction analysis and spectroscopic methods in solution and in the solid state. Both complexes demonstrate a profound catalytic activity in the stereoselective oxidation of cis-1,2-dimethylcyclohexane (model substrate) with m-CPBA (m-chloroperbenzoic acid) under mild conditions in the presence of promoters of various acidity (HNO3, TFA and HOAc). The heterometallic binuclear CoIIICdII pre-catalyst (2) was more active than the mononuclear CoIII one (1), exhibiting higher products yields up to 51% and excellent stereospecificity (up to 99.2% retention of stereoconfiguration). This result could be associated with a synergistic effect of two different metals in 2. Based on the large obtained kinetic isotope effect and H2 18O labeling studies, the overall reaction mechanism was proposed to proceed without the participation of free alkyl radicals. The acidity of the promoter was shown to influence catalytic parameters for both 1 and 2 so that the better parameters are achieved with the acid possessing lower pK a values (a stronger acid). The comparison of the catalytic behaviours of 1 and 2 is discussed in detail considering relevant examples from the literature.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.004
      Issue No: Vol. 560 (2018)
  • On the hydrothermal stability of Cu/SSZ-13 SCR catalysts
    • Authors: Feng Gao; János Szanyi
      Pages: 185 - 194
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Feng Gao, János Szanyi
      Cu/SSZ-13 SCR catalysts have been extensively studied in the past decade or so. Hydrothermal stability of these catalysts has been identified as the most important criterion for application. In this perspective, we describe recent atomic-level understanding of their hydrothermal stability. In particular, electron paramagnetic resonance (EPR) is shown to rather accurately quantify isolated Cu(II) ions and CuO clusters in fresh and aged catalysts to demonstrate the remarkable hydrothermal stability for Cu2+ ions located in 6-membered ring windows, and the conversion of [Cu(OH)]+ ions in Chabazite cages to CuO clusters. The hydrothermal stability difference of the two isolated Cu(II) ions is confirmed with DFT simulations and the conversion of [Cu(OH)]+ to CuO is proposed to involve formation, migration and condensation of Cu(OH)2 intermediates. The structural destructive role of CuO clusters is attributed to mesopore formation from their migration, which more severely damages the catalysts than dealumination. Finally, perspectives are given on new strategies for low-temperature NOx removal, rational design and refinement of Cu/SSZ-13, and development of new Cu/zeolite SCR catalysts with even better performance than the state-of-the-art Cu/SSZ-13.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.040
      Issue No: Vol. 560 (2018)
  • Superior performance of α@β-MnO2 for the toluene oxidation: Active
           interface and oxygen vacancy
    • Authors: Na Huang; Zhenping Qu; Cui Dong; Yuan Qin; Xiaoxiao Duan
      Pages: 195 - 205
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Na Huang, Zhenping Qu, Cui Dong, Yuan Qin, Xiaoxiao Duan
      The crystalline phase of manganese dioxide catalysts shows strong influence on its catalytic performance, and the construction of hierarchically nanostructured materials with active interface and oxygen vacancy is an effective approach to develop the enhanced functionality. Herein, nanosized MnO2 catalysts with α-, β- and hierarchically α@β-crystal phases were synthesized. α@β-MnO2 catalysts showed the excellent activity than pure MnO2 in toluene combustion, either α-MnO2 or β-MnO2. The catalytic activity was strongly related with the ratio of α-MnO2 and β-MnO2 in α@β-MnO2 catalyst, and α@β-MnO2 (1:1) exhibited the highest activity for toluene oxidation and toluene can be completely oxidized to CO2 and H2O at about 205 °C with a space velocity (GSHV) of 30,000 h−1. HRTEM, Raman and XPS demonstrated that α@β-MnO2 owned the abundant defects due to the mixed phase interfacial structure. The strong synergistic effect in α@β-MnO2 catalyst with larger specific area enhanced and facilitated the adsorption and activation of toluene molecules and oxygen species. The mobility of oxygen species and low-temperature reducibility compared with pure MnO2 were significantly enhanced. When the ratio of α-MnO2 and β-MnO2 was 1:1, α@β-MnO2 reached the maximum biphase interface content, formed large amount of oxygen vacancy, and showed the strongest synergistic effect and activation ability for reactants. Thus it was thought that the formation of the special biphase structure of α@β-MnO2 was beneficial to the improvement of toluene catalytic oxidation activity.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.001
      Issue No: Vol. 560 (2018)
  • Vanadium poisoning of FCC catalysts: A quantitative analysis of
           impregnated and real equilibrium catalysts
    • Authors: N.L.A. Souza; I. Tkach; E. Morgado; K. Krambrock
      Pages: 206 - 214
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): N.L.A. Souza, I. Tkach, E. Morgado, K. Krambrock
      Amongst the contaminant transition metals Fe, Ni, V that deposits onto the fluid catalytic cracking (FCC) catalyst and promote unwanted secondary reactions, vanadium is the most deleterious one because not only acts as undesired dehydrogenation site but also migrates deeper inside the catalyst particles under the FCC regeneration conditions, stabilizing in different phases that attack the crystalline structure of the catalyst, thus resulting in its irreversible loss of activity. The mechanisms through which vanadium affect the catalyst during its use in the FCC process remain under debate and the accurate determination of the chemical species involved and of their concentration is of paramount importance for the investigations in this field. In this work, a quantification methodology for contaminant vanadium in FCC catalysts was developed based on X-ray fluorescence (XRF) and electron paramagnetic resonance (EPR). A commercial FCC catalyst was artificially contaminated with vanadium at different loads by pore volume impregnation with aqueous vanadyl sulfate solution, in the presence or not of a complexing agent, followed by steam deactivation at 788 °C/5 h, and the samples were compared to spent FCC catalysts from different Brazilian refineries. It has been shown that EPR is a very sensitive and reliable technique to quantify vanadyl ions (V4+) in FCC catalysts while lower valence states such as V3+ have not been detected in any of the samples studied. Vanadyl ions (VO2+) deposited onto the catalyst are mostly oxidized to higher valence state species and the extent of this oxidation in equilibrium catalysts from FCC units was calculated and related to the combustion mode at which the FCC regenerators operate. The artificial vanadium contamination and deactivation protocol adopted in this work resulted in a proportion of V4+/Vtotal of nearly 10%, similar to that of equilibrium catalysts sampled from FCC units with full combustion regeneration. The present study brings a new interpretation for the EPR signal detected as a broad unstructured line, with evidences of some vanadium existing as a ferri-/ferromagnetic surface phase in the catalyst particles, likely formed by induced oxygen vacancies during reaction (reducing atmosphere) and quite resistant to the regeneration step.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.003
      Issue No: Vol. 560 (2018)
  • Fibrous platelet carbon nanofibers-silica fiber composite supports for a
           Co-based catalyst in the steam reforming of acetic acid
    • Authors: Paweesuda Natewong; Natthawan Prasongthum; Sareena Mhadmhan; Prasert Reubroycharoen
      Pages: 215 - 224
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Paweesuda Natewong, Natthawan Prasongthum, Sareena Mhadmhan, Prasert Reubroycharoen
      A novel fibrous composite of platelet carbon nanofibers-silica fiber (PCNFs-SF) was synthesized via acetic acid steam reforming (ASR) and then employed as a support for a Co catalyst in the ASR. For comparison, the catalytic behavior of cobalt (Co) catalysts supported on carbon nanotubes-silica fiber (CNTs-SF), silica fiber (SF) and porous silica (Q10) was also studied. The characterization by field emission scanning electron microscopy and transmission electron microscopy analyses demonstrated that the PCNFs-SF was like graphite stacked platelets. Both PCNFs-SF and CNTs-SF composite supports enhanced the dispersion of metallic cobalt to achieve smaller Co2O3 particle sizes and strengthen the metal-support interaction. Consequently, the Co/PCNFs-SF and Co/CNTs-SF composite catalysts afforded a higher ASR catalytic activity and selectivity towards hydrogen production than that of the Co/SF and Co/Q10 catalysts. The presence of the carbon nanostructure in the catalyst composites was also found to improve the long-term stability in ASR. The activity of the Co/PCNFs-SF and Co/CNTs-SF composite catalysts remained stable all times during a 12 h stability test. The strong interaction between metal and support together with the unique structure of PCNFs-SF and CNTs-SF composites could effectively suppress deactivation of the catalysts in ASR.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.04.021
      Issue No: Vol. 560 (2018)
  • Hybrid silica based catalysts prepared by the encapsulation of zirconocene
           compound via non-hydrolytic sol-gel method for ethylene polymerization
    • Authors: Larissa Brentano Capeletti; Maria do Carmo Martins Alves; Mateus Borba Cardoso; João Henrique Zimnoch dos Santos
      Pages: 225 - 235
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Larissa Brentano Capeletti, Maria do Carmo Martins Alves, Mateus Borba Cardoso, João Henrique Zimnoch dos Santos
      Different hybrid silica-encapsulated metallocene catalysts were prepared by a non-hydrolytic sol-gel method and evaluated in ethylene polymerization. The employed organic groups to modify the silica network were methyl, octyl, octadecyl, vinyl, phenyl, chloropropyl, iodopropyl and glycidoxypropil and the encapsulated catalyst was bis(cyclopentadienyl)zirconiun IV chloride. The catalysts were characterized in terms of zirconium content, structure and texture via Fourier transform infrared spectroscopy, x-ray absorption spectroscopy, nitrogen porosimetry and small angle x-ray scattering and morphology by transmission electronic microscopy. The polymerzation activity results varied in the range of 1650–2850 kg PE/mol Zr.p.h, showing an increase for all the hybrid materials if compared to the non-hybrid one. Polymers characteristics such as crystallinity, melting temperature and molecular weight were shown to be affected by the nature of the organic moieties present on the catalyst support. These findings highlight the material potentiality for tuning the product characteristics depending on the organosilane present on the catalyst system.
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.03.013
      Issue No: Vol. 560 (2018)
  • Isomerization of α-pinene oxide over ZSM-5 based micro-mesoporous
    • Authors: Nataliya D. Shcherban; Roman Yu. Barakov; Päivi Mäki-Arvela; Sergii A. Sergiienko; Igor Bezverkhyy; Kari Eränen; Dmitry Yu. Murzin
      Pages: 236 - 247
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Nataliya D. Shcherban, Roman Yu. Barakov, Päivi Mäki-Arvela, Sergii A. Sergiienko, Igor Bezverkhyy, Kari Eränen, Dmitry Yu. Murzin
      Few types of ZSM-5 based micro-mesoporous materials obtained via a dual template method, steam-assisted conversion and dual-functional templating were evaluated in α-pinene oxide isomerization. Complete conversion and the highest selectivity towards trans-carveol (ca. 40–43%) were achieved over X-ray amorphous micro-mesoporous aluminosilicates as well as mesoporous molecular sieves AlSi-SBA-15. In addition, X-ray amorphous samples containing the secondary building units of ZSM-5 zeolite demonstrated the highest rate of α-pinene oxide isomerization. The yield of the most desired product trans-carveol to a large extent depends on the accessibility of acid sites to the reagents molecules and acidity of the catalysts (strength and concentration of Brønsted and Lewis acid sites).
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      PubDate: 2018-05-31T11:47:20Z
      DOI: 10.1016/j.apcata.2018.05.007
      Issue No: Vol. 560 (2018)
  • MFI zeolite coating with intrazeolitic aluminum (acidic) gradient
           supported on SiC foams to improve the methanol-to-propylene (MTP) reaction
    • Authors: Yilai Jiao; Shaojun Xu; Chunhai Jiang; Michal Perdjon; Xiaolei Fan; Jinsong Zhang
      Pages: 1 - 9
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Yilai Jiao, Shaojun Xu, Chunhai Jiang, Michal Perdjon, Xiaolei Fan, Jinsong Zhang
      To hinder the deactivation and improve the propylene selectivity in the methanol-to-propylene (MTP) reaction, MFI coating with the intrazeolitic aluminum (acidic) gradient supported on SiC foam support (G-MFI/SiC foam) was proposed. The solid polycrystalline silicon was used in the synthesis of G-MFI/SiC foam catalyst provided a prolonged release of silica nutrient in the liquid phase and suppressed the precipitation phenomena. The resulting MFI coating showed the aluminum gradient along the surface normal direction of SiC foams with ZSM-5 layer (about 20 μm) near the SiC surface followed by the silicalite-1 layer (about 10 μm). The alumina (acidic) gradient in the MFI coating renders a passive outer layer of silicalite-1 with fairly large amount of weak and medium acid sites prevented the coke formation as well as promoted the selectivity to propylene in the MTP reaction. Compared to the conventional ZSM-5/SiC foam catalyst, the G-MFI/SiC foam catalyst showed excellent performance in the MTP reaction with good catalytic longevity (8 h vs. 76 h for >95% methanol conversion) and low coke deposition (6.7 × 10−3 wt.% h−1 vs. 0.26 wt.% h−1), as well as high propylene selectivity (ca. 36% vs. 46%).
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.006
      Issue No: Vol. 559 (2018)
  • Screening of Ni-Cu bimetallic catalysts for hydrogen and carbon
           nanofilaments production via catalytic decomposition of methane
    • Authors: D. Torres; J.L. Pinilla; I. Suelves
      Pages: 10 - 19
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): D. Torres, J.L. Pinilla, I. Suelves
      The catalytic decomposition of methane (CDM) is a H2 production process in which the CO2 emission of conventional processes is avoided and from which carbon nanofilaments can be obtained as a high added value by-product. In this work, we present a thermogravimetry-based screening of catalysts according to their carbon production in the CDM reaction. Catalysts studied were based on Ni as active phase, using two textural promoters (Al2O3 or MgO) and Cu as dopant element in different proportions: 2.5, 5.0, 7.5 and 10 mol %. Cu doping resulted in an increase in both the maximum temperature of activity (>100 °C) and the carbon formation rate, which were maximum for a Cu content of 7.5 mol %, regardless of the textural promoter used. The formation of a solid solution of Ni(x)Cu(1-x), with lattice constants and particle size distribution highly dependent on the Cu content, led to the formation of fishbone carbon nanofibers with different morphological features, such as the α angle between the graphene stacks and the growth axis of the nanofilament, the diameter, the length and the formation or not of an inner hollow.
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      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.011
      Issue No: Vol. 559 (2018)
  • Liquid phase hydrodeoxygenation of anisole, 4-ethylphenol and benzofuran
           using Ni, Ru and Pd supported on USY zeolite
    • Authors: David P. Gamliel; Stavros Karakalos; Julia A. Valla
      Pages: 20 - 29
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): David P. Gamliel, Stavros Karakalos, Julia A. Valla
      The objective of this work is to understand the role of metals on the hydrodeoxygenation (HDO) reaction pathways of three bio-oil model compounds. Ni, Ru and Pd were impregnated on USY zeolite, and the catalysts were characterized to determine metal reduction profile, surface concentration and nanoparticle size. Ru-USY and Pd-USY were completely reduced at a temperature below 450 °C, but Ni-USY still contained surface metal oxides after reduction. There was no indication of strong interactions between the metals and USY support. Anisole, 4-ethylphenol and benzofuran were used as bio-oil model compounds, in order to determine the effects of each metal on deoxygenation of methoxy-, phenol and furan functional groups, respectively. Pd-USY was the most effective HDO catalyst, exhibiting the highest turnover frequency for HDO of all three model compounds, in addition to and high selectivity to deoxygenated products. A mechanism was proposed for each model compound, and the kinetics of hydrogenation, dehydration, CC coupling and ring-opening reactions were determined.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.004
      Issue No: Vol. 559 (2018)
  • Synthesis of hierarchically structured alumina support with adjustable
           nanocrystalline aggregation towards efficient hydrodesulfurization
    • Authors: Yunyun Dong; Yingrui Xu; Yuqi Zhang; Xinyi Lian; Xiaodong Yi; Yao Zhou; Weiping Fang
      Pages: 30 - 39
      Abstract: Publication date: 5 June 2018
      Source:Applied Catalysis A: General, Volume 559
      Author(s): Yunyun Dong, Yingrui Xu, Yuqi Zhang, Xinyi Lian, Xiaodong Yi, Yao Zhou, Weiping Fang
      The development of highly active hydrodesulfurization (HDS) catalysts is still of great importance in hydroprocessing of the heavy residue oils in industry. Herein, hierarchically structured alumina hollow microspheres with high specific surface area were successfully prepared via a citric-acid-modulated hydrothermal method. With different dosages of citric acid applied, alumina microspheres were assembled with different specific surface areas, pore volumes and acidity. After the loading of the MoNi active components, a series of HDS catalysts were characterized systematically by various relevant techniques; and their catalytic activity and selectivity towards hydrodesulfurization of dibenzothiophene (DBT) were evaluated and compared. It is revealed that, the catalytic efficiency of the catalyst highly depends on the factors including the specific surface area and the acidity, the sulfidity and the dispersion of the active metal components. On this basis, we have established a facile method for preparation of hierarchically structured alumina supports with desirable physicochemical properties and high HDS catalytic efficiency. This work could also provide theoretical guidance for rational design of highly active HDS catalysts.
      Graphical abstract image

      PubDate: 2018-04-25T00:35:58Z
      DOI: 10.1016/j.apcata.2018.04.007
      Issue No: Vol. 559 (2018)
  • NiyCo1-yMn2Ox microspheres for the selective catalytic reduction of NOx
           with NH3: The synergetic effects between Ni and Co for improving
           low-temperature catalytic performance
    • Authors: Jian-Wen Shi; Gao Zhaoyang Fan Chen Gao Baorui Wang Yao
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Jian-Wen Shi, Ge Gao, Zhaoyang Fan, Chen Gao, Baorui Wang, Yao Wang, Zhihui Li, Chi He, Chunming Niu
      A series of NiyCo1-yMn2Ox microspheres (MSs) (y = 0.1, 0.3, 0.5, 0.7, 0.9) were synthesized successfully by a hydrothermal method. Their physicochemical properties of the as-prepared NiyCo1-yMn2Ox MSs were explored by using a series of characterizations, and their catalytic performances were evaluated by the selective catalytic reduction (SCR) of NOx with NH3. It was found that there are the synergetic effects between Ni and Co, which have an important impact on the surface physicochemical properties of NiyCo1-yMn2Ox MSs, such as the roughness of the surface, the stacking molding, the crystal structure, the specific surface area, the concentrations of surface Mn4+, Co3+ and Ni2+, the reducibility, and the proportion of weak acid and strong acid sites, etc, which further affect the reaction mechanism of de-NOx of NiyCo1-yMn2Ox MSs, and finally dominate their catalytic performances for the SCR of NOx with NH3. Among all NiyCo1-yMn2Ox MSs, Ni0.7Co0.3Mn2Ox exhibits the optimal catalytic performance for the SCR of NOx, which is much better than CoMn2Ox and NiMn2Ox. This work may shed light on the deliberately designed Mn-based SCR catalysts with high activity by taking advantage of the synergetic effects between components.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
  • Insight into the mode of action of Pd-doped zero-valent iron nanoparticles
           @graphene (Pd/FePs@G) toward carbon tetrachloride dechlorination reaction
           in aqueous solution
    • Authors: Yiyang Yeyao; Wang Xiaofan Fansheng Meng Yang
      Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560
      Author(s): Yiyang Ma, Yeyao Wang, Xiaofan Lv, Fansheng Meng, Qi Yang
      Herein, Pd/Fe bimetallic nanoparticles (Pd/FePs) were uniformly distributed on the surface of graphene sheet structure, and had good combination with the multilayer substrate. The nanocomposites could maintain high reactivity even after five times degradation reactions of carbon tetrachloride (CT) in succession, indicating that the modified technology had a positive effect on achieving high surface activity and prolonging the longevity. The structure evolution and compositional changes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photo-electron spectroscopy (XPS). Also, humic acid (HA) as non-reactive adsorbate could preferentially occupy surface active sites of Pd/FePs to mediate the predominant radical species in the degradation process, which caused a 53% decrease in dechlorination rate of CT. These findings provided an important understanding of the stability and reactive mechanism involved in Pd/Fe bimetallic system toward CT degradation. Moreover, batch experiments were conducted to investigate the actual catalytic activity in view of the effects of common inorganic anions in aqueous solution. The results revealed that the presence of Cl − , HCO3 − , and HPO4 2− was beneficial to the CT degradation while SO4 2- and NO3 − exerted the negative effects. Based on the detection results by means of gas chromatography (GC) and ion chromatography (IC), a possible degradation pathway was propose.
      Graphical abstract image

      PubDate: 2018-05-31T11:47:20Z
  • Graphical abstract TOC
    • Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560

      PubDate: 2018-05-31T11:47:20Z
  • Graphical abstract TOC
    • Abstract: Publication date: 25 June 2018
      Source:Applied Catalysis A: General, Volume 560

      PubDate: 2018-05-31T11:47:20Z
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