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Catalytic conversion of glucose to small polyols over a binary catalyst of vanadium modified beta zeolite and Ru/C

Journal of Energy Chemistry 2019年第7期28卷 88-95页

作者： joby sebastian Mingyuan Zheng Xinsheng Li Jifeng Pang Chan Wang Tao Zhang Dalian Institute of Chemical Physics Chinese Academy of Sciences

Catalytic conversion of glucose, the most abundant carbohydrate, to chemicals of petroleum origin has great desirability in terms of sustainability and industrial implementation. In this work, we attempted to exploit the vanadium-based catalysts with high retro-aldol condensation(RAC) activity for the synthesis of small polyols from glucose. Vanadium species incorporated or anchored beta zeolites were found to work effectively in synergy with 1 Ru/AC to produce hydroxyacetone(HA) as the major product(34%)in a semi-continuously stirred tank reactor under 5% glucose concentration. Catalyst characterization by UV-vis and Raman spectral analysis revealed vanadium species mainly stayed in the incorporated form(tetrahedral) at 0.5% of loading and in the supported form(octahedral) at higher loadings up to 8%. Pyridine infrared spectra and temperature programmed desorption of NH3 revealed weak Lewis acid sites in dominance. Vanadium species in the catalysts displayed multiple catalytic roles(isomerization and RAC reaction, and synergism with the hydrogenation catalyst) in the synthesis of HA from glucose. Structureactivity correlation pointed out that the catalytic activity of vanadium species is not dependent on it coordination status, nevertheless, the adjacent vanadium atoms could possibly improve the isomerization rate over the RAC rate in favor of high yield of HA. The catalyst system is recyclable to at least five times without any considerable loss in its activity and structural integrity. The results presented here provide a promising route for the sustainable production of HA and polyols from carbohydrates by using a highly selective vanadium catalyst.

关键词： Vanadium Glucose Retro-aldol condensation Polyols Hydroxyacetone

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Preparation and Characterization of ZnSe/EVA Nanocomposites for Photovoltaic Modules

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Journal of Minerals and Materials Characterization and Engineering 2015年第4期3卷 215-224页

作者： Jose sebastian Eby Thomas Thachil Jobin Job Mathen Augustine J. Edakkara Nelson Kuriakose Ginson P. Joseph joby sebastian Department of Polymer Science & Rubber Technology Cochin University of Science and Technology Kerala India Department of Physics Loyola College Chennai Tamilnadu India Department of Physics St. Thomas College Pala Kerala India Department of Physics St. Thomas College Thrissur Kerala India

ZnSe Nanoparticles were synthesized by solvothermal method and the particle was characterized by Transmission Electron Microscopy. The polymer nanocomposite of 2% and 4% ZnSe/EVA was fabricated by direct sonicator method. The nanocomposites were characterized by UV-Vis-NIR and FT-IR spectroscopy. The thermal behaviour of the samples was also investigated and we found that the thermal stability of the composites increased with increasing the filler concentrations. The mechanical properties such as tensile strength, peel strength and refractive index of the samples were also studied and reported for the first.

关键词： EVA ZnSe TG-DTA Refractive Index Peel Strength Tensile Strength

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