Abstract
Two series of supported vanadia catalysts, namely V/Al 2O 3 and V/SiO 2, with V 2O 5 loadings up to 20%, have been studied in their oxidized state by ESCA, and their reducibility has been studied by gravimetry. The vanadium was found to be highly, possibly monomolecularly, dispersed in the oxidized catalysts. Upon reduction in hydrogen at 500°C, the V/Al 20 3 catalysts showed stable V 4+ state as inferred by gravimetric measurements. Hydrogen-reduced V/Si0 2 catalysts showed about 70% reduction of V 5+ to V 3+. The results are discussed in terms of possible surface species present on these catalysts.
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