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Structure and Size of Bimetallic Palladium - Platinum Clusters in an Hydrotreatment Catalyst — Highly dispersed supported bimetallic PdPt catalysts were prepared by incipient wetness co-impregnation of alumina with platinum bis-acetylacetonate Pt(Acac) 2 and palladium bis-acetylacetonate Pd(Acac)2. The resulting Pt4Pd/Al2O3 and Pt6Pd/Al2O3 catalytic systems dedicated to hydro-dearomatization in presence of sulfur were characterized by X-ray absorption spectroscopy, transmission electron microscopy and volumetric H 2-O2 titration. Direct structural evidence is given of the presence of nanometer bimetallic particles. Moreover, the complete set of results indicates a "cherry-like" structure for the bimetallic clusters with a preferential distribution of palladium atoms at the cluster surface. Catalytic results shows that the optimum composition leading to the appropriate surface structure must be adjusted as a function of the size of the clusters.

Structure and Size of Bimetallic Palladium-Platinum Clusters in an Hydrotreatment