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Date of Publication:2021-01-01

Journal:Huagong Xuebao/CIESC Journal

Volume:72

Issue:11

Page Number:5590-5597

ISSN No.:0438-1157

Abstract:A boron phosphate/silica oxide (BPO4/SiO2) catalyst with fibrous structure after calcination was prepared by electrospinning. The effects of BPO4 loadings and calcination temperatures of the catalysts on the structure and catalytic performance for oxidative dehydrogenation of propane (ODHP) were investigated. Studies have found that the calcination process reduces the fiber diameter. With the increase of BPO4 loading, the activity of propane oxidative dehydrogenation increased. The BPO4/SiO2 catalyst calcined at 600℃ with BPO4 loading of 7%(mass) showed the best catalytic performance for ODHP. The conversion rate of propane and the yield of propylene for the catalyst at the reaction temperature of 480℃ reached 17.0% and 13.0%, respectively. Meanwhile, the stability test indicated that the catalyst was stable during the reaction. The results showed that when the calcination temperature was low (550℃), the organic molecules in the catalysts were not completely removed, resulting in low olefin selectivity. However, the SiO2 structure shrank tightly and inhibited the exposure of the active phase with the high calcination temperature (700℃). The catalytic activity of the nanofibrous catalyst was much higher than the conventional bulk BPO4 catalyst at the same conditions, demonstrating that the structure could expose more active sites. © 2021, Editorial Board of CIESC Journal. All right reserved.

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