Showing papers by "Zi Gao published in 2020"

Efficient Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate over V2O5/g-C3N4 Catalysts.

Abstract: Graphitic carbon nitride (g-C3N4)-supported V2O5 catalysts were prepared by the impregnation pyrolysis method, and their physicochemical properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), Raman, X-ray photoelectron spectroscopy (XPS), UV-vis, TGA, N2 adsorption, and H2-TPR These catalysts exhibit extremely high activity and selectivity in the aerobic oxidation of ethyl lactate to ethyl pyruvate The excellent catalytic performance derives from the high surface-chemisorbed oxygen species Low calcination temperature and interaction with g-C3N4 are conducive to increasing the surface-chemisorbed oxygen species of V2O5 The optimal catalyst 13V2O5/g-C3N4 gives 962% conversion of ethyl lactate with 856% selectivity toward ethyl pyruvate in 4 h at 130 °C and 1 atm oxygen, which is significantly superior to those of previously reported V-containing catalysts This catalyst is also stable and reusable, and the ethyl pyruvate yield is reduced by less than 10% after four runs without any regeneration treatment

A Highly Efficient Bifunctional Catalyst CoOx/tri-g-C3N4 for One-Pot Aerobic Oxidation–Knoevenagel Condensation Reaction

Abstract: A highly efficient bifunctional catalyst of an s-triazine-based carbon-nitride-supported cobalt oxide is developed for the aerobic oxidation–Knoevenagel condensation tandem reaction of benzyl alcohol and malononitrile, whereby 964% benzyl alcohol conversion with nearly 100% selectivity towards benzylmalononitrile can be obtained in 6 h at 80 °C The excellent catalytic performance derives from the high basicity of carbon nitride and strong redox ability of Co species induced by carbon nitride The catalyst is also quite stable and can be reused without any regeneration treatment, whose product yield is only an 115% reduction after four runs

Au/TiO2 for Ethane Dehydrogenation: Effect of Silica Doping

Abstract: Dehydrogenation of ethane to ethylene over silica-doped TiO2 supported Au catalysts was investigated. The silica doping of TiO2 support greatly improved the dehydrogenation activity of Au supported catalysts, which can be ascribed to the reduced Au particle size. An ethane conversion of 15.8% and ethylene selectivity of 94.8% can be obtained over the catalyst with SiO2 doping of 20 wt%. However, the activity would begin to decrease with further increasing of SiO2 content, since the proportion of Auδ+ species decreased monotonically with SiO2 amount, which may also play an important role in ethane dehydrogenation.