Abstract
The effect of support on the surface composition and structure of supported PtRu bimetallic clusters has been studied. Surface enrichment in Pt occurred for all of the catalysts studied. However, it occurred to a greater extent when the clusters were supported on alumina. Both metal dispersion and percentage total metal exposure were observed to increase significantly as a result of the clustering process. The internal structure of the Pt Ru SiO 2 clusters consisted of a Ru-rich core surrounded by a Pt-rich outer shell consistent with the cherry model. Pt Ru Al 2O 3 clusters did not have this structure. The inner and outer metal shells were equilibrated in the case of the Pt Ru Al 2O 3 clusters, but not for the Pt Ru SiO 2 clusters. The effect of O 2 treatment resulted in a further Pt enrichment in the case of the Pt Ru SiO 2 clusters but did not cause any structural changes in the Pt Ru Al 2O 3 clusters. Separate Pt and Ru particles did not form under any of the experimental conditions used in this study.
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