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Deactivation and regeneration of hydrogenolysis activity over Rh-Ag bimetallic catalysts supported on TiO/sub 2/

Conference ·
OSTI ID:6771266
An indirect effect of support on the kind of bimetallic interaction was observed on Rh-Ag catalysts supported on TiO/sub 2/ compared to SiO/sub 2/. This effect occurs at significantly lower temperatures than the direct Strong Metal-Support Interaction (SMSI) between Rh and TiO/sub 2/. The main feature of this indirect effect is a pronounced decay in the H/sub 2/ chemisorption capability and activity for ethane hydrogenolysis with time when the catalysts are left in flowing H/sub 2/ at 523K. 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/sub 2/ chemisorption capacity can be regenerated by an oxidation-reduction treatment.
Research Organization:
Yale Univ., New Haven, CT (USA). Dept. of Chemical Engineering
DOE Contract Number:
AC02-81ER10829
OSTI ID:
6771266
Report Number(s):
CONF-821106-6; ON: DE82021240
Country of Publication:
United States
Language:
English