Deep oxidation of propane over WO3 - promoted Pt/BN catalysts: The critical role of Pt - WO3 interface
Deep oxidation of propane over WO3 - promoted Pt/BN catalysts: The critical role of Pt - WO3 interface
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WO3 促进的 Pt/BN 催化剂上丙烷的深度氧化：Pt - WO3 界面的关键作用
DOI：
10.1016/j.apcatb.2020.118858
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发表时间：
2020-09-05
影响因子：
22.1
通讯作者：
Lu, Ji-Qing
中科院分区：
文献类型：
--
作者：
Liao, Wen-Min;Fang, Xiu-Xiu;Lu, Ji-Qing
在Pt/BN催化剂中添加WO 3，可显著提高丙烷深度氧化性能。W含量为7重量%的催化剂（1 Pt-7 W/BN）具有最高的活性（在220 ℃下的反应速率为367.1 μ mol g（Pt）（-1）s（-1）），其是1 Pt/BN上的活性（反应速率为52.4 μ mol g（Pt）（-1）s（-1））的7倍。W促进的催化剂在干、湿反应条件下均稳定，具有良好的应用前景。详细的动力学和原位漫反射红外光谱的结果的基础上，Pt-WO 3界面的网站作为新的活性位点，这是负责提高活性。吸附在Pt原子上的丙烷与相邻的WOx表面羟基之间的反应促进了C-H键的断裂，这是该反应体系的动力学关键步骤。
The addition of WO3 in the Pt/BN catalyst significantly promotes the performance for deep oxidation of propane. A catalyst with a W content of 7 wt.% (1 Pt-7 W/BN) has the highest activity (a reaction rate of 367.1 mu mol g(Pt)(-1) s(-1) at 220 degrees C), which is 7-fold as high as that on the 1 Pt/BN (a reaction rate of 52.4 mu mol g(Pt)(-1) s(-1)). The W-promoted catalysts are stable under dry and wet reaction conditions, showing promising potential in practical applications. Based on detailed kinetics and in-situ diffuse reflectance infrared spectroscopy results, the Pt-WO3 interfacial sites serve as new active sites which are responsible for the improved activity. The facile reaction between propane adsorbed on Pt atom and surface hydroxyl groups on adjacent WOx accelerates the cleavage of the C-H bond, which is the kinetically essential step in this reaction system.