Temperature dependence of nuclear magnetic resonance chemical shifts of 129Xe in the alpha-cages of NaY zeolite

One- and two-dimensional NMR spectra of 129Xe sorbed in NaY zeolite at a loading of about 1 Xe atom/4 alpha-cages were investigated as a function of temperature. The data were fitted to the simple statistical mechanical cylindrical pore model of Cheung producing a van der Waals adsorption energy of 3.3 kJ/mol. Two-dimensional data indicated that the intercrystalline diffusion is slow compared to intracrystalline diffusion. Findings showed that the Xe atoms spend most of their time in the alpha-cages and at the lower temperatures, near the cage walls.