Abstract
The acidic properties of supported vanadium-aluminum catalysts have been studied by the IR and UV spectroscopy of adsorbed pyridine. Introduction of vanadium ions does not result in the appearance of acidity of the Bronsted type in the temperature range under study (25–500°C). The adsorption of pyridine on samples containing large amounts of V2O5 reversibly increases the transmission in the IR region, which is due to the decrease of current carrier concentration. On pure Al2O3, pyridine is oxidized beginning with 400°C; V2O5 decreases the temperature of the beginning of oxidation to 200–300°C.
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