Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI, 53706, USA.
Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI, 53706, USA.
ChemSusChem. 2020 Jan 9;13(1):152-158. doi: 10.1002/cssc.201901663. Epub 2019 Oct 11.
In recent years, hexagonal boron nitride (hBN) has emerged as an unexpected catalyst for the oxidative dehydrogenation of alkanes. Here, the versatility of hBN was extended to alkane oxidative cracking chemistry by investigating the production of ethylene and propylene from n-butane. Cracking selectivity was primarily controlled by the ratio of n-butane to O within the reactant feed. Under O -lean conditions, increasing temperature led to increased selectivity to ethylene and propylene and decreased selectivity to CO . In addition to surface-mediated chemistry, homogeneous gas-phase reactions likely contributed to the observed product distribution, and a reaction mechanism was proposed based on these observations. The catalyst showed good stability under oxidative cracking conditions for 100 h time-on-stream while maintaining high selectivity to ethylene and propylene.
近年来，六方氮化硼（hBN）作为烷烃氧化脱氢反应的一种意外催化剂而崭露头角。在此，通过研究正丁烷的氧化裂解反应，拓展了 hBN 在烷烃氧化裂解化学中的应用。裂解选择性主要由反应物进料中 n- 丁烷与 O 的比例控制。在 O 贫条件下，升高温度会导致乙烯和丙烯的选择性增加，而 CO 的选择性降低。除了表面介导的化学反应外，均相气相反应可能对观察到的产物分布有贡献，并基于这些观察提出了一种反应机制。该催化剂在 100 h 的运行时间内保持了高乙烯和丙烯选择性，同时在氧化裂解条件下表现出良好的稳定性。
