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Plasma Tuning Local Environment of Hexagonal Boron Nitride for Oxidative Dehydrogenation of Propane
Author(s) -
Liu Zhankai,
Yan Bing,
Meng Shengyan,
Liu Rui,
Lu WenDuo,
Sheng Jian,
Yi Yanhui,
Lu AnHui
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202106713
Subject(s) - dehydrogenation , propane , catalysis , boron nitride , boron , selectivity , crystallinity , materials science , olefin fiber , inorganic chemistry , sintering , hexagonal boron nitride , chemistry , chemical engineering , photochemistry , graphene , nanotechnology , organic chemistry , crystallography , metallurgy , engineering
Hexagonal boron nitride ( h ‐BN) has lately received great attention in the oxidative dehydrogenation (ODH) reaction of propane to propylene for its extraordinary olefin selectivity in contrast to metal oxides. However, high crystallinity of commercial h ‐BN and elusive cognition of active sites hindered the enhancement of utilization efficiency. Herein, four kinds of plasmas (N 2 , O 2 , H 2 , Ar) were accordingly employed to regulate the local chemical environment of h ‐BN. N 2 ‐treated BN exhibited a remarkable activity, i.e., 26.0 % propane conversion with 89.4 % selectivity toward olefins at 520 °C. Spectroscopy demonstrated that “three‐boron center” N‐defects in the catalyst played a pivotal role in facilitating the conversion of propane. While the sintering effect of the “BO x ” species in O 2 ‐treated BN, led to the suppressed catalytic performance (12.4 % conversion at 520 °C).