Abstract
Temperature programmed desorption (TPD) is applied to the study of the surface of Aerosil. The resultant chromatograms differentiate between molecular water adsorbed on the surface and various silanol groups that exist on it. It is found that molecular water is restored even though the solid is subjected to temperatures at which its total removal would be expected. The TPD method also allows the heterogeneity of the surface silanol groups to be shown, as well as the influence of physisorbed water on the dehydration of the Aerosil surface.
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