The present invention relates to a catalyst system for the production of ketones from epoxides. A catalyst composition is provided comprising at least one precious metal and at least one mixed oxide comprising zirconium dioxide and silicon dioxide; wherein the precious metal is supported and the support is not entirely made of the mixed oxide; and wherein a mass ratio of zirconium dioxide to silicon dioxide in the mixed oxide is 86:14 to 99.9:0.1. Moreover, a method for preparing a catalyst composition containing the above constituents is provided, wherein the specific surface area of the mixed oxide is 5-155 m<2>/g and the precious metal is supported on the mixed oxide and the mixed oxide has a monomodal pore radius distribution. To produce the mixed oxide, firstly a mouldable mass is prepared which at least comprises a zirconium compound, silicon dioxide as solid having a particle size of at least 100 nm and water. The mouldable mass is then calcined at a temperature of from 300 to 500 degrees centigrade. The catalyst system can be used for the production of ketones from a compound containing at least one epoxy group.