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KMID : 1059519920360030351
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Journal of the Korean Chemical Society
1992 Volume.36 No. 3 p.351 ~ p.359
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Study of Xenon Adsorption on Alkaline-Earth Cation in Y Zeolite Based on Chemical Shift in 129Xe NMR Spectrum
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Park Chan-Ho
Ryoo Ryong
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Abstract
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Interaction of xenon with alkaline-earth cations in Y zeolite supercage was studied by xenon adsorption and 129Xe NMR experiments. The CaY and the BaY samples were prepared by exchanging Ca2+ and Ba2+ into a high-purity NaY zeolite. Xenon adsorption isotherms of these samples were obtained by using a conventional volummetric gas adsorption apparatus in the range of 260 to 320 K and the chemical shift in the 129Xe NMR spectrum of the adsorbed xenon was measured at 296 K. The chemical shift against pressure was quantitatively explained assuming that the xenon gas exchanged very rapidly between various adsorption sites consisting of zeolite-framework surface and alkaline-earth ion. From this analysis, it was found that the alkaline-earth ion adsorbed xenon more strongly than Na+ ion and zeolite-framework surface. Baring on the difference of the adsorption strength, the number of the alkaline-earth cations present in the zeolite supercage could be estimated by analyzing the adsorption isotherm.
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