NMR spectroscopy of xenon sorbed in pentasil zeolites: silicalites

{sup 129}Xe NMR spectroscopy of xenon sorbed in silicalite samples shows a complex line shape. The authors conclude that there are at least two regions in these samples, one of which is a macroscopic region free of occlusions and the other is a region (or regions) containing occlusions. The authors suggest that these occlusions are residual template molecules from the preparation of the material. Analysis of commercial preparations of silicalite and one prepared in this laboratory indicates that xenon NMR spectroscopy is a simple, straightforward means of examining residual template or other macroscopic occlusions in similar microporous materials.