REVIEW: DEHYDRATION CATALYSTS FOR THE METHANOL/DIMETHYL ETHER REACTION
- 1 December 1991
- journal article
- research article
- Published by Taylor & Francis Ltd in Chemical Engineering Communications
- Vol. 110 (1), 123-142
- https://doi.org/10.1080/00986449108939946
Abstract
Catalysts for the methanol/dimethyl ether reaction are reviewed with particular emphasis on the acid/base properties of the catalysts. The focus is on temperatues less than around 300°C and atmospheric pressure conditions, which correspond to potential automotive applications. Mechanisms including both dual site (acid/base) Langmiur-Hinshelwood and single site Rideal-Eley mechanisms have been postulated, with both Bronsted and Lewis acid sites involved in the dehydration reaction. Temperatures higher than about 300°C, as well as a strong surface acidity, tend to promote the further dehydration of DME to form C2-Q5 olefins and eventually hydrocarbon products in a series type reaction sequence. Methods exist, particularly in zeolites, to control the strength and type of surface acidity, and therefore the selectivity to DME.Keywords
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