129Xe nuclear magnetic resonance studies of the porous structure of silica gels

Abstract

The porous structure of a number of silica gels is characterized by ¹²⁹Xe NMR of adsorbed xenon. On the basis of experimental data for the samples with well defined structure, an empirical correlation between the ¹²⁹Xe NMR chemical shift and the parameters of the porous structure is proposed. The energetic parameters of xenon adsorption have been obtained from the temperature dependence of the chemical shifts. The possibilities and limitations of ¹²⁹Xe NMR spectroscopy of adsorbed xenon for studying the porous structure of silica gel are discussed.