Enhanced Catalytic Performance of Fe‐containing HZSM‐5 for Ethane Non‐Oxidative Dehydrogenation via Hydrothermal Post‐Treatment

• Published in: ChemCatChem Vol. 13; no. 18; pp. 4019 - 4028
• Main Authors: Wu, Lizhi, Fu, Zhiyuan, Ren, Zhuangzhuang, Wei, Jinhe, Gao, Xinhua, Tan, Li, Tang, Yu
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 17.09.2021
• Subjects: Carburizing; Catalytic activity; Coke; Dehydrogenation; Desorption; Ethane; Ethane dehydrogenation; Ethylene; Fe/ZSM-5; highly dispersed Fe; hydrothermal post-treatment; Iron; Reaction time
• ISSN: 1867-3880; 1867-3899
• DOI: 10.1002/cctc.202100752

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 C2H4 s−1 gFe−1 over different Fe loading, which is twice as much as that of 1.0Fe/HZ5‐IWI. According to various characterizations, isolated Fe3+ 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. Hydrothermal post‐treatment: A high‐performance ethane non‐oxidative dehydrogenation is prepared via hydrothermal post‐treatment. Isolated Fe3+ species and carburized Fe species are active sites, and the excellent catalytic performance is ascribed to more disperse Fe species and exposing more Fe species in the surface.