Review on Hierarchically Porous BEA and ZSM-5 Zeolites and Its Industrial Catalytic Applications

Zeolites can be modified to hierarchical zeolites, where a secondary porosity (meso or macro pores) is generated to provide an ideal space for the deposition of active phases.This multiparous ZSM-5 and BEA zeolites showed an enhanced accessibility of active sites present in the materials, leading to an improved catalytic activity in reactions involving bulky molecules.A wide variety of innovative synthesis strategies were developed to make a secondary porosity in zeolites.In this mini review, the progress made in the last ten years concerning the synthesis of hierarchically porous BEA and ZSM-5 zeolites and their applications in industrially important reactions are focused.We also discussed the challenges for researchers and scientists for making the hierarchical structured zeolites.