Enhanced Catalytic Performance of Fe‐containing HZSM‐5 for Ethane Non‐Oxidative Dehydrogenation via Hydrothermal Post‐Treatment
Lizhi Wu, Zhiyuan Fu, Zhuangzhuang Ren, Jinhe Wei, Xinhua Gao, Li Tan, Yu Tang
Abstract
Abstract A facile strategy is applied to construct Fe supported ZSM‐5 (Fe/HZ5‐HTS) via hydrothermal post‐treatment and applied to ethane non‐oxidative dehydrogenation. Compared with Fe/HZ5‐IWI prepared by incipient wetness impregnation, Fe/HZ5‐HTS exhibits superior catalytic activity and long catalyst stability with 6000 minutes time‐on‐stream. An obvious volcanic curve is observed between the ethylene generation rate and Fe content, and 1.0Fe/HZ5‐HTS exhibits the highest ethylene generation rate with 0.166 mmol C 2 H 4 s −1 g Fe −1 over different Fe loading, which is twice as much as that of 1.0Fe/HZ5‐IWI. According to various characterizations, isolated Fe 3+ species and carburized Fe species are active sites, and the better catalytic performance over 1.0Fe/HZ5‐HTS is ascribed to more disperse Fe species and exposing more Fe species in the surface. Besides, the lower ethylene desorption temperature and higher ethane desorption temperature over Fe/HZ5‐HTS could suppress the overreaction of the ethylene to generate coke and increase ethane residence reaction time, resulting in less coke deposition and facilitating the catalytic performance.