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- W2778976711 abstract "VOX-doped porous SiO2 solids (VOX-SiO2) were synthesized at different gelation and calcination temperatures through an in-situ one-step synthesis and evaluated by non-oxidative propane dehydrogenation (PDH), exhibiting excellent catalytic performance. VOX-SiO2 catalysts were characterized by XRD, low-temperature N2 adsorption/desorption, SEM, TEM, UV–Vis, Raman, XPS, NH3-TPD, H2-TPR, and TGA. The structural and performance results for the catalysts reveal that gelation temperature has only a slight effect on the surface acidity, textural properties and VOX species dispersion of VOX-SiO2 catalysts within a reasonable temperature range (30–60 °C). The 60-VOX-SiO2-580 catalyst, with a gelation temperature of 60 °C, a calcination temperature of 580 °C, and prepared by the one-step synthesis method, obviously shortens gelation process time by half compared to catalyst gelled at 30 °C and exhibits superior catalytic performance for PDH. Over high gelation temperature (≥75 °C) leads to the loss of integrity and decreases catalytic activity of the VOX-SiO2 catalysts. Compared with the VOX-MCM-41 catalyst prepared by a one-step hydrothermal method, VOX-SiO2 catalysts exhibit better catalytic activity and stability. Importantly, at a reaction temperature of 580 °C, the 60-VOX-SiO2-580 catalyst exhibits remarkable long-term catalytic stability in the eight reaction-regeneration cycles for PDH. Its propane conversion shows a slow decrease from 55% to 45% for a 4 h reaction duration, but the propene selectivity remains at approximately 91%. The results of this work will be beneficial for further industrial development and application of porous VOX-SiO2 solids in catalysis." @default.
- W2778976711 created "2018-01-05" @default.
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- W2778976711 date "2018-02-01" @default.
- W2778976711 modified "2023-10-17" @default.
- W2778976711 title "Influence of gelation and calcination temperature on the structure-performance of porous VOX-SiO2 solids in non-oxidative propane dehydrogenation" @default.
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- W2778976711 doi "https://doi.org/10.1016/j.jcat.2017.12.004" @default.
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