One‐pot Synthesis of Hierarchical, Micro‐macroporous Zeolites with Encapsulated Metal Particles as Sinter‐resistant, Bifunctional Catalysts

We report a new one-pot synthesis procedure for hierarchical zeolites with intracrystalline macropores and metal particles encapsulated within the zeolitic walls. The allows to prepare macroporous of MFI topology different heteroatoms (silicalite-1, ZSM-5 TS-1) noble particles, such as gold, platinum palladium. hierarchically structured contain large diameters around 400 nm, which are well distributed interconnected should significantly enhance mass transport properties. encapsulation nanoparticles walls leads remarkable sinter resistance particles. Encapsulated gold (2.6 nm) do not change in size during an 18-hour treatment at 600 °C under air, while non-encapsulated heavily same treatment. Catalytic experiments direct epoxidation propene hydrogen oxygen show that both catalytic functions TS-1 sample encapsulates accessible active. This catalyst displays high activity, although PO selectivity could still be improved. These materials great potential use applications, due their bifunctional nature, sintering resistance, shape selective properties structure.