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129Xe NMR Linewidths as Indicators of Spatial Inhomogeneities in Zeolites

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Abstract:

The widths of the 129Xe nuclear magnetic resonance (NMR) lines of xenon in zinc- and cadmium-exchanged zeolites NaY and HY were measured at ambient temperature as a function of the xenon gas equilibrium pressure. It is demonstrated that the observed values of the linewidths as well as their quite different dependence on pressure can be explained on the basis of a theoretical approach which traces back the origin of line broadening to inhomogeneous spatial distributions of transition metal cation sites interacting strongly with the encaged xenon atoms.

Keywords: 129Xe NMR spectroscopy; Linewidth analysis; Zeolites

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702963904818

Affiliations: Lehrstuhl für Physikalische Chemie II, Universität Dortmund, Otto-Hahn-Str. 6, D-44227 Dortmund, Germany

Publication date: November 1, 1996

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