Abstract
After dehydration at 350°C, most of the La 3+ ions in La, Na-Y tend to irreversibly migrate into sodalite or D6R cages while the Na + ions prefer to stay in supercages. In Cs, Na—Y, the large Cs + ions can not diffuse through the hexagonal prism into the D6R or sodalite cages and occupy the sites in supercages, irrespective of their hydration state. The 129 Xe chemical shift and the adsorption isotherm of xenon on Cs, Na—Y, Na—Y and La, Na—Y zeolites were used to probe the variation of cations location and occupation at different sites as a function of their hydration state. The results agree with 23 Na 1D and 2D nutation NMR and the known structure data.
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