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

• Published in: Oil & gas science and technology Vol. 60; no. 5; pp. 801 - 813
• Main Authors: Bazin, D, Guillaume, D, Pichon, Ch, Uzio, D, Lopez, S
• Format: Journal Article
• Language: English
• Published: 01.09.2005
• ISSN: 1294-4475
• DOI: 10.2516/ogst:2005057

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 H2*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.