Surface probing of synthetic faujasites by adsorption of carbon dioxide. Part 1.—Infra-red study of carbon dioxide adsorbed on Na-Ca-Y and Na-Mg-Y zeolites
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 69, 1056-1068
- https://doi.org/10.1039/f19736901056
Abstract
Infra-red spectroscopy of carbon dioxide adsorbed on Na-Ca(Mg)-Y faujasites is used to determine the distribution of Ca and Mg ions over the cation sites. Physisorption of CO2 provides a sensitive method for the detection of Ca2+ and Mg2+ in supercage positions. High temperature outgassing of the samples facilitates the migration of bivalent ions from positions in the supercage to the small cavities. Bivalent ions in the dehydrated Y samples are only present in the supercages when the degree of ion exchange is 46 to 48% or higher. For high temperature chemisorption of CO2, the chemisorbed species are closely related to co-ordinated carbonate ions. The concentration of this species does not exceed 2 molecules per unit cell.Keywords
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