Abstract
The kinetics of the exchange of zeolite hydroxyl groups with deuterium gas was studied on H–CaY and Pt/H–CaY zeolites using quantitative infrared spectroscopy to follow the 3 640 cm–1 hydroxyl band. The rate of exchange on H–CaY is first order between 500 and 700 K while that on the Pt containing material, studied from 250 to 400 K, decreased exponentially with time. The exchange rate on Pt/H–CaY was 105 faster than that on H–CaY alone. In both cases, however, the exchange mechanism is similar; the hydroxyl hydrogen migrates to the exchange site where exchange occurs. Pressure dependence of the rate, kinetic isotope effects and the rate increase due to water were also measured.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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