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论文类型： 期刊论文

发表时间： 2017-05-23

发表刊物： CHEMCATCHEM

收录刊物： SCIE、EI

卷号： 9

期号： 10

页面范围： 1788-1793

ISSN号： 1867-3880

关键字： boron; dehydrogenation; hydrocarbons; hydroxylation; nitrides

摘要： Oxidative dehydrogenation of propane to olefins is a promising alternative route to industrialized direct dehydrogenation, but encounters the difficulty in selectivity control for olefins because of the overoxidation reactions that produce a substantial amount of undesired CO2. Here we report edge-hydroxylated boron nitride, a metal-free catalyst, that efficiently catalyzed dehydrogenation of propane to propylene with superior selectivity (80.2 %) but with only negligible CO2 formation (0.5%) at a given propane conversion of 20.6 %. Remarkable stability was evidenced by the operation of a 300 h test with steady conversion and product selectivity. The active BNO center dot site, generated dynamically through hydrogen abstraction of B-OH groups by molecular oxygen, triggered propane dehydrogenation by selectively breaking the C-H bond but simultaneously shut off the pathway of propylene overoxidation towards CO2.