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Sulfiding of bulk and alumina-supported vanadium oxides has been studied using temperature-programmed sulfiding and reduction techniques. Bulk compounds (V 2 O 5 , V 2 O 3 ) and V/Al 2 O 3 catalysts are sulfided via a similar mechanism. For bulk V 2 O 5 , two major sulfiding steps have been identified. At temperatures up to 673 K, V ...
Sulfided alumina-supported transition metal catalysts have been studied using temperature-programmed reduction (TPR). The H 2 and H 2 S concentrations were determined simultaneously and the major processes occurring were discriminated, namely reduction of oxidic and sulfidic species and desorption of H 2 S. Because of the high maximum reduction temperature and the high hydrogen...