PD/SIO2 HYDROGENATION CATALYST, THE PROCESS OF PREPARING THE CATALYST AND ITS USE FOR PRODUCING HYDROGEN PEROXIDE

摘要

An amorphous silica supported palladium catalyst is provided which also contains a small amount of an additive metal compound selected from an oxide, hydroxide and carbonate of zirconium, thorium, hafnium, cerium, titanium and aluminum. By use of particular preparation conditions and the amount of additive metal salt raw material used, the additive metal compound deposits from solution before or simultaneously with a palladium compound. The additive metal compound deposits on the silica support and serves as a base for the subsequently deposited palladium compound which is later reduced to palladium metal. The described catalyst is particularly suitable as a hydrogenation catalyst in a cyclic process for the manufacture of hydrogen peroxide.