a catalyst , useful for the direct epoxidation of olefins , is disclosed . the catalyst comprises palladium nanoparticles , support nanoparticles , and a titanium zeolite having a particle size of 2 microns or greater . the palladium nanoparticles are deposited on the support nanoparticles to form supported palladium nanoparticles , and the supported palladium nanoparticles are deposited on the titanium zeolite ; or the supported palladium nanoparticles are deposited on a carrier having a particle size of 2 microns or greater . the invention also includes a process for producing an epoxide comprising reacting an olefin , hydrogen and oxygen in the presence of the catalyst . the catalysts are more active in epoxidation reactions , while demonstrating the same or better selectivity .