Rationally designing hierarchical zeolites for better diffusion and catalyst efficiency

Thanks to various crystalline topologies, tunable chemical composition, high (hydro)thermal stability, and controllable surface acidity/basicity, zeolites are widely used in petroleum refining, petrochemical manufacture, fine chemical synthesis, biomedicine, environmental chemistry, etc. However, for many zeolite-catalyzed reactions, the molecular diameters of the reaction species involved are often larger than the pore apertures of the zeolites. This leads to undesired diffusion resistance between the bulk phase and the active centers of the catalyst, thereby significantly reducing the catalyst efficiency.

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