HIGH-RESOLUTION NMR ON ADSORBATE-ADSORBENT SYSTEMS

High resolution multinuclear NMR on adsorbed molecules and on the structure of zeolites is reviewed both from a methodical point of view and from interest in heterogeneous catalytic systems. The conditions for measurements of highly resolved **1**3C and **1**5N NMR spectra of adsorbed molecules, the state of the adsorbed molecules, their mobility, the identification of the surface active sites and the study of catalytic transformations are discussed. General features of solid-state **2**9Si magic-angle spinning NMR spectra of zeolites and different applications of this method are discussed, including silicon-aluminum ordering, detection of silicon atoms bearing hydroxyl groups and properties of aluminum-deficient zeolites.