Abstract
The adsorption isotherms and 129Xe n.m.r. chemical shifts of xenon in silver-exchanged yAgNaY zeolites ( y from 5 to 100%) after high-temperature (400°C) dehydration as well as subsequent oxidation were measured at 26°C. A three-site sorption model taking into account adsorbateadsorbate interaction was developed that reproduces simultaneously the adsorption isotherms and the chemical shift vs. concentration curves up to xenon loadings of about 6 sol atoms supercage . The upfield displacements of the chemical shifts in the silver-exchanged zeolites with respect to NaY are attributed to the interaction of xenon with a small portion of the supercage silver cations, probably those unlocalized or residing on crystallographic SIII sites.
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