Acidity/basicity, electron donor properties and catalytic activity of sulphate modified stannic oxide

The surface electron donor properties of sulphate modified stannic oxide ha ve been determined from the adsorption of electron accepters of various ele ctron affinities on the oxide surface. The acid base properties of stannic oxide have been determined by titration method using Hammett indicators. Ca talytic activities of the oxide for esterification of acetic acid using n-b utanol, reduction of cyclohexanone in 2-propanol and oxidation of cyclohexa nol with benzophenone have been studied. The data have been correlated with the surface electron donor properties of these oxides. The activity for re duction and oxidation decreases and that for esterification reaction increa ses on modification with sulphate ion. It has been found that electron dona ting capacity decreased when stannic oxide was modified with sulphate ion.