RESEARCH PROGRESS ON PREPARATION METHODS OF HIERARCHICAL POROUS ZEOLITES

Abstract

Abstract: Zeolites have been widely used in petrochemical industry and fine chemical industry because of their unique topological structure, which endows them with excellent framework acidity, ion-exchange performance, stability and shape selectivity. However, the existence of crystal structure limits the pore size of zeolites to microporous size, which affects the diffusion efficiency and limits their scope of application in catalytic reactions. The diffusion distance can effectively shorten by constructing hierarchical porous structures in zeolites. So far, the strategies for constructing hierarchical porous structures could be divided into two strategies: "top-down" and "bottom-up". In this paper, the above two strategies and their effects on mesopores were summarized.

Key words: hierarchical pore, zeolite, relative crystallinity, diffusion efficiency, open mesopores

References

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