Abstract
Xenon adsorption studies on sodic and protonic forms of Y and ZSM-20 zeolites were carried out. 129Xe-NMR (nuclear magnetic resonance) spectra obtained at low temperature (144K) can depend on the state of aggregation of zeolites. This is noted by the broadening of the NMR line, and the appearance of distinct peaks, with the increase of adsorbed Xe. An attempt to assign the different NMR signals of xenon adsorbed in the supercages and in the intercrystaline voids is made. The Xe adsorption isotherms, near room temperature, were determined and the analysis of the heats and entropies of adsorption there from obtained was made. The results obtained revealed to be highly sensitive to the presence of monovalent cations and are interpreted in terms of the different interactions between xenon and the various zeolites.
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