A polymer-bound palladium (II) chloride complex has been prepared by the reaction of palladium chloride with a chelate resin of 8-aminoquinoline. Refluxing the complex in methanol-water solution

it gives a polymer-bound mixed valence palladium catalyst. The activity and selectivity for hydrogenation of the olefins with the above catalyst have been studied. It was found that the polymer-bound mixed valence palladium catalyst is more active and selective for hydro-genations of olefins. The catalvst is also stable. There is no obvious loss of palladium of the catalyst.