Abstract
Crystallite aggregates of NaY, BaY, CaY, FeY, and RuY zeolites have been studied via 129Xe NMR spectroscopy. The response of the 129Xe resonance of adsorbed xenon depends upon the aggregate size. This effect is observed in CaY, RuY, and FeY zeolites. Both the chemical shift and the linewidth of the 129Xe resonance display a large aggregate size dependence. Differences in linewidths are observed in BaY and NaY zeolites. Samples made by mixing RuY zeolite with Na-Y exhibit a motional narrowing, which also depends upon aggregate size. A packing dependence is observed in samples of FeY and in mixed samples containing both RuY and NaY. These results are consistent with a model in which xenon atoms migrate over many zeolite crystallites on the NMR timescale. The aggregate size effects are attributed to intercrystalline diffusion and residence of xenon atoms in the mesopore structure occurring at aggregate grain boundaries.
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