Abstract
An indirect effect of support on the kind of bimetallic interaction has been observed on Rh-Ag catalysts supported on TiO 2 compared to SiO 2. This effect occurs at significantly lower temperatures than the direct Strong Metal-Support Inter- action (SMSI) between Rh and TiO 2. The main feature of this indirect effect is a pronounced decay in the H 2 chemisorption capability and activity for ethane hydrogenolysis with time when the catalysts are left in flowing H 2 at 523 K. This behavior can be rationalized in terms of a modification of the energetics of the metal-metal interaction, which may cause the Ag to spread over Rh particles. Hydrogenolysis activity and H 2 chemisorption capacity can be regenerated by an oxidation-reduction treatment.
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