Dehydration of bio-ethanol to ethylene over iron exchanged HZSM-5

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• 作者：Baohui Chen^a ; ^b ; ^{bymountains@gmail.com} ; Jiazheng Lu^a ; Lianping Wu^b ; Zisheng Chao^b
• 关键词：Iron ; ZSM-5 ; Dehydration ; Ethanol ; Ethylene
• 刊名：Chinese Journal of Catalysis
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：37
• 期：11
• 页码：1941-1948
• 全文大小：848 K
• 卷排序：37

文摘

Iron exchanged ZSM-5 with Si/Al ratio from 25 to 300 prepared by three consecutive ion exchanges was used for the dehydration of ethanol to ethylene. The iron exchanged ZSM-5 (Si/Al = 25) catalyst with an iron content of 0.46 wt% gave 97%−99% yield of ethylene at 98%−99% conversion of ethanol at 260 °C and 0.81 h−1 liquid hourly space velocity. The high performance was maintained for 60 d on-stream. X-ray diffraction, Fourier transform infrared spectroscopy of pyridine adsorption, NH3 temperature-programmed desorption and diffuse reflectance UV-vis spectroscopy were used for catalyst characterization. Ion exchange with iron decreased the total acidity of the zeolite, especially the strong acid sites and Brönsted acid sites. The doped iron species were distributed over Fe-ZSM-5 as predominantly isolated Fe3+. Therefore, the catalytic performance for ethanol dehydration to ethylene was improved.