THE INFLUENCE OF PROCESSING ON DEACTIVATION AND HYDROGEN SPILLOVER PHENOMENA ON SILICAS AND SILICA-SUPPORTED METAL-CATALYSTS

This paper provides evidence that the synthesis and subsequent process ing of silicas controls the fundamental network structure of the mater ial which, in turn, influences adsorption properties, dispersion of su pported metals, catalytic activity, the nature of coke deposits and th e deactivation profiles of the silicas and associated silica-supported catalysts. In this work two silica-supported platinum catalysts are s tudied. The catalyst supported on a silica prepared by a sol-gel synth esis is seen to promote hydrogen spillover and adsorption of hydrogen on the supported metal relative to the catalyst supported on a silica prepared by flame hydrolysis.