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Catalytic Performances of Binder‐free ZSM‐5 Catalysts for Dehydration of Crude Methanol to Dimethyl Ether
Author(s) -
Wang Jing,
Cheng Xiaowei,
Guo Juan,
Chen Xiaocheng,
He Heyong,
Long Yingcai
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090051
Subject(s) - dimethyl ether , catalysis , chemistry , methanol , magic angle spinning , zeolite , selectivity , dehydration , microporous material , mesoporous material , sorption , inorganic chemistry , chemical engineering , organic chemistry , adsorption , nuclear magnetic resonance spectroscopy , biochemistry , engineering
A series of binder‐free ZSM‐5 catalysts and a binder‐containing catalyst were prepared and characterized with X‐ray diffraction (XRD), X‐ray fluorescence (XRF), 27 Al magic‐angle spinning (MAS) nuclear magnetic resonance (NMR), N 2 sorption and ammonia temperature‐programmed deposition (TPD) methods. The catalytic activity and selectivity in the dehydration of crude methanol to dimethyl ether (DME) were evaluated in a fixed‐bed reactor for the catalysts. The outstanding structural characters such as high zeolite contents, sufficiently open channels and richness in mesopores have been proved on these binder‐free catalysts. The influence of the solid‐acidity, which is closely related to the framework silica alumina ratio (SAR) of the catalysts, on the catalytic properties has been discussed. A binder‐free catalyst with a better potential in application has been selected for its high activity and selectivity, long life‐time and non‐sensitivity to water contents in the feed. The reason for its excellent performance of the catalyst was discussed.