STRUCTURE AND CATALYSIS OF A SIO2-SUPPORTED GOLD-PLATINUM CLUSTER [(PPH(3))PT(PPH(3)AU)(6)](NO3)(2)

A novel catalyst of [(PPh(3))Pt(AuPPh(3))(6)] (NO3)(2) 1 supported on SiO2 was very active in H-2-D-2 equilibration with a TOF of 29.8 s(-1) , while it showed low activity for ethene hydrogenation and CO oxidati on at 303 K. It was found that the catalysis of 1/SiO2 was not caused by platinum particle impurity but by the platinum atom which bound to the gold atoms in the cluster. The cluster framework of 1/SiO2 was sta ble during the reactions at 303 K. The change of Au-Pt bond in 1/SiO2 by heat treatment and the catalytic performance of produced cluster fr agments were characterized by EXAFS, FT-IR and kinetic investigation.