脱氢
选择性
催化作用
丙烷
烯烃纤维
硼
化学
无机化学
吸附
钒
碳氢化合物
光化学
有机化学
作者
Jinshu Tian,Jiwei Li,Shuya Qian,Zhaoxia Zhang,Shaolong Wan,Shuai Wang,Jingdong Lin,Yong Wang
标识
DOI:10.1016/j.apcata.2021.118271
摘要
Boron-based catalysts have been reported to exhibit high selectivity to olefins in oxidative dehydrogenation of propane (ODHP). However, the origin of their superior ODHP selectivity to conventional vanadium-based catalysts is still under debate. In this work, we proposed that oxidized boron species is the active site for highly selective olefin formation in ODHP on boron-based catalysts. Combined isotopic and kinetic experiments suggested that O2 weakly bonds to the electron-deficient B center to form non-dissociative >B--O-O--B< on catalyst surface, which directly reacts with propane from the gas phase as a moderate oxidant in ODHP. The high selectivity of olefins in ODHP on such boron-based catalysts is due to the suppressed adsorption of olefins on>B--O-O--B< sites. These findings offer in-depth knowledge of ODHP on boron-based catalysts.
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