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In‐situ FTIR studies of dimethyl ether adsorption on H‐ZSM‐5 zeolites

In‐situ FTIR studies of dimethyl ether adsorption on H‐ZSM‐5 zeolites In situ infrared spectra of dimethyl ether adsorbed on two H‐ZSM‐5 zeolites are reported which are different in both lattice and extraframework aluminium contents. A number of dissociatively adsorbed dimethyl ether species associated respectively with the Bronsted acid sites, the external silanol groups and extraframework aluminium species at different temperatures are identified. In particular, dimethyl ether reacts with non acidic hydroxyl species associated with extraframework aluminium to form the third methoxy species. The distributions of hydrocarbons desorbed from a single pulse of dimethyl ether (1.0 mL) onto these zeolite samples are presented. Propene is the major product, and the yield of hydrocarbons correlates with the concentration of Bronsted acid bound methoxy groups. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Chemistry Wiley

In‐situ FTIR studies of dimethyl ether adsorption on H‐ZSM‐5 zeolites

Chinese Journal of Chemistry , Volume 14 (6) – Nov 1, 1996

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References (11)

Publisher
Wiley
Copyright
Copyright © 1996 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1001-604X
eISSN
1614-7065
DOI
10.1002/cjoc.19960140604
Publisher site
See Article on Publisher Site

Abstract

In situ infrared spectra of dimethyl ether adsorbed on two H‐ZSM‐5 zeolites are reported which are different in both lattice and extraframework aluminium contents. A number of dissociatively adsorbed dimethyl ether species associated respectively with the Bronsted acid sites, the external silanol groups and extraframework aluminium species at different temperatures are identified. In particular, dimethyl ether reacts with non acidic hydroxyl species associated with extraframework aluminium to form the third methoxy species. The distributions of hydrocarbons desorbed from a single pulse of dimethyl ether (1.0 mL) onto these zeolite samples are presented. Propene is the major product, and the yield of hydrocarbons correlates with the concentration of Bronsted acid bound methoxy groups.

Journal

Chinese Journal of ChemistryWiley

Published: Nov 1, 1996

Keywords: ; ; ;

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