Abstract
Deuteron NMR relaxation methods including double quantum filtered (DQF) spectral analyses were examined to study the dynamics of benzene molecules adsorbed in faujasite-type zeolite. To describe the dynamics of benzene molecules, a modified cone model involving in-plane rotation, wobbling motion and the characteristic order parameter was applied. The characteristic order parameter describes the intracage restricted reorientation for a single-site adsorption. For multiple-site adsorption such as in NaY, the site-to-site hopping processes result in cage disorder and yield a small characteristic order parameter. The wobbling motion is induced by the diffusive motion and therefore the correlation time of wobbling motion may be invoked to estimate the self-diffusion coefficient of benzene adsorbed in NaY, DAY, USY and NaX. Comparisons with kinetic Monte Carlo calculation, pulsed field gradient measurement, and other NMR relaxation studies are discussed. Copyright © 1999 John Wiley & Sons, Ltd.
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