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Proceedings Paper

In-situ Fourier transform infrared studies of reaction mechanisms in heterogeneous catalysis
Author(s): Jean-Claude Lavalley; Mohamed Maache; Jacques Saussey
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Paper Abstract

An I.R. cell which can be used, in heterogeneous catalysis, as a continuous flow reactor up to 3 MPa and 575K is described. It is coupled to an on-line gas chromatograph for product analysis. It simultaneously allows recording the I.R. spectra of adsorbed species during the reaction, a pressed wafer being the catalyst. Using a FT-JR spectrometer, spectra can be recorded every 5 seconds. The system has been used to study different reactions such as i) n-hexane isomerization on H-mordenite and Pt-H-mordenite catalysts; ii) CO hydrogenation over Rh/CeO2 catalysts; iii) methanol synthesis on Cu-ZnAl2O4 catalysts with variable CO + CO2 + H2 feeds. Special attention has been paid to determine if the species which are observed are intermediates in the studied processes. In such a case, their detection provides very useful access to the reaction mechanisms. Moreover, the system allows us to follow the state of catalysts, under working conditions, for instance the degree of the zeolite deactivation or the reduction state of copper in the case of methanol catalysis.

Paper Details

Date Published: 1 November 1990
PDF: 12 pages
Proc. SPIE 1341, Infrared Technology XVI, (1 November 1990); doi: 10.1117/12.23098
Show Author Affiliations
Jean-Claude Lavalley, Univ. de Caen (France)
Mohamed Maache, Univ. de Caen (France)
Jacques Saussey, Univ. de Caen (France)

Published in SPIE Proceedings Vol. 1341:
Infrared Technology XVI
Irving J. Spiro, Editor(s)

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