Abstract
Oxidation characteristics of Ru/CeO 2 were investigated by N 2O decomposition in the presence of C 3H 6, by temperature programmed desorption (TPD), IR, and XAFS measurements using C 3H 6 as a probe molecule. Ru/CeO 2 (Ru: 5 wt%) had highly dispersed Ru species which formed Ru O Ce and Ru O bonds. This Ru species was in the five-coordination environment and reacted rapidly with allylic hydrogen of C 3H 6, providing its double bond oxygen. The Ru O site was easily regenerated under oxygen atmosphere. This type of metal-oxo species was not formed for Pt, Pd, and Rh on CeO 2. The peculiar oxidation property of Ru/CeO 2 catalyst was due to the Ru O species. The optimal preparation procedure for producing Ru O species was to support Ru on hydrated Ce(OH) 3 without drying or calcinations. The saturated amount of Ru O species was 2 wt% loading of Ru.
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