Jiang Xiao, Zhang Xuanyu, Purdy Stephen C, He Yang, Huang Zhennan, You Rui, Wei Zeyue, Meyer Harry M, Yang Jiuzhong, Pan Yang, Wu Peiwen, Zhu Wenshuai, Chi Miaofang, Page Katharine, Huang Weixin, Wu Zili
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China.
JACS Au. 2022 Apr 1;2(5):1096-1104. doi: 10.1021/jacsau.1c00542. eCollection 2022 May 23.
Featuring high olefin selectivity, hexagonal boron nitride (h-BN) has emerged recently as an attractive catalyst for oxidative dehydrogenation of propane (ODHP). Herein, we report that dispersion of vanadium oxide onto BN facilitates the oxyfunctionalization of BN to generate more BO active sites to catalyze ODHP via the Eley-Rideal mechanism and concurrently produce nitric oxide to initiate additional gas-phase radical chemistry and to introduce redox VO sites to catalyze ODHP via the Mars-van Krevelen mechanism, all of which promote the catalytic performance of BN for ODHP. As a result, loading 0.5 wt % V onto BN has doubled the yield of light alkene (C-C) at 540-580 °C, and adding an appropriate concentration of NO in the reactants further enhances the catalytic performance. These results provide a potential strategy for developing efficient h-BN-based catalysts through coupling gas-phase and surface reactions for the ODHP process.
六方氮化硼（h-BN）具有高烯烃选择性，最近已成为丙烷氧化脱氢（ODHP）的一种有吸引力的催化剂。在此，我们报道将氧化钒分散到BN上有助于BN的氧官能化，从而产生更多的BO活性位点，通过Eley-Rideal机理催化ODHP，并同时产生一氧化氮以引发额外的气相自由基化学，并引入氧化还原VO位点通过Mars-van Krevelen机理催化ODHP，所有这些都促进了BN对ODHP的催化性能。结果，在540-580°C下，在BN上负载0.5 wt%的V使轻质烯烃（C-C）的产率提高了一倍，并且在反应物中添加适当浓度的NO进一步提高了催化性能。这些结果为通过耦合气相和表面反应开发用于ODHP过程的高效h-BN基催化剂提供了一种潜在策略。
