期刊
FUEL PROCESSING TECHNOLOGY
卷 126, 期 -, 页码 343-349出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2014.05.013
关键词
ZSM-5; n-Hexane steam cracking; Dealumination; Coke deposition; Propylene
资金
- New Energy and Industrial Technology Development Organization (NEDO), Japan
H-ZSM-5 catalyst was initially active for the steam cracking of n-hexane to produce propylene and ethylene; however, the H-ZSM-5 catalyst deactivated. Understanding the deactivation reason of the ZSM-5 catalyst during the catalytic steam cracking is essential to develop the durable catalyst. It was revealed that the dealumination of ZSM-5 occurred under the steam flow at the reaction temperature, from the characterization results of H-ZSM-5 and pre-steamed H-ZSM-5 by SEM, XRD, ICP, N-2 adsorption, Al-27 MAS NMR, and NH3-WD. The coke deposition also occurred during the steam cracking of n-hexane as suggested by TG-DTA result of the used H-ZSM-5 catalyst. The used H-ZSM-5 catalysts were regenerated by calcination for a removal of coke deposition and the regenerated catalysts were used for the n-hexane steam cracking again. The initial conversion over the regenerated H-ZSM-5 was partially recovered, indicating that the H-ZSM-5 catalyst was deactivated reversibly by the coke deposition and irreversibly by the dealumination during the n-hexane steam cracking. (C) 2014 Elsevier B.V. All rights reserved.
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