CHEMICAL-VAPOR-DEPOSITION OF PLATINUM HEXAFLUOROACETYLACETONATE INSIDE KL ZEOLITE - A NEW ROUTE TO NONACIDIC PLATINUM-IN-ZEOLITE CATALYSTS

Platinum hexafluoroacetylacetonate can be selectivity introduced inside KL zeolite channels via CVD in a flow of Ar at 70°C. Metal particles are then formed via thermal removal of the volatile organic ligands under H2 at 350°C. In situ DRIFTS and EXAFS measurements suggest the formation of very small Pt clusters with a nucleophilic character. These nonacidic Pt/KL catalysts show remarkably high activity and selectivity in the conversion of methylcyclopentane to benzene at 500°C. A long catalyst life is achieved due to reduced coke formation and a very slow sintering rate. © 1994 Academic Press, Inc.