Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (11): 1941-1948.DOI: 10.1016/S1872-2067(16)62524-X

• Article • Previous Articles     Next Articles

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

Baohui Chena,b, Jiazheng Lua, Lianping Wub, Zisheng Chaob   

  1. a State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, Hunan Electric Power Corporation Disaster Prevention and Reduction Center, State Grid Key Laboratory of Power Transmission and Distribution Equipment Anti-Icing & Reducing-Disaster Technology, Changsha 410007, Hunan, China;
    b State Key Laboratory of Chemo/ Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China
  • Received:2016-05-27 Revised:2016-08-03 Online:2016-11-25 Published:2016-11-25
  • Contact: Zisheng Chao, Tel/Fax:+86-731-86332074; E-mail:bymountains@gmail.com
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21376068) and the China Postdoctoral Science Foundation (2016M592424).

Abstract:

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 eth-anol at 260℃ 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, espe-cially 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 dehydra-tion to ethylene was improved.

Key words: Iron, ZSM-5, Dehydration, Ethanol, Ethylene