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Creating Hierarchical Pores in Zeolite Catalysts

2019; Elsevier BV; Volume: 1; Issue: 6 Linguagem: Inglês

10.1016/j.trechm.2019.05.010

2589-7209

Risheng Bai, Yue Song, Yi Li, Jihong Yu,

Catalytic Processes in Materials Science

HighlightsHierarchical zeolites with two (or more) levels of pore size are advantageous for many industrially important catalytic reactions.In addition to the conventional demetallization methods and mesoporogen methods, there has been increasing interest in the development of the cost-efficient mesoporogen-free methods for generating zeolite hierarchical structures.Hierarchical zeolites have been applied in various important catalytic reactions, which show remarkably improved catalytic activity and selectivity. However, the inherent relationship between the hierarchical structures and the catalytic properties remains not fully understood.AbstractHierarchical zeolites containing both microporosity and meso/macroporosity have emerged as a new and important branch of zeolites due to their potential for improving mass transfer and molecular accessibility, which are key to overcoming steric, diffusional, and coke-formation limitations in catalytic reactions. In this review, we present significant recent progress in the fabrication of hierarchical zeolites via mesoporogen, mesoporogen-free, and demetallization strategies and discuss the advantages and disadvantages of each method. The impact of the hierarchical structures of zeolites (e.g., CHA, FAU) on their enhanced catalytic activity and product selectivity is highlighted. Finally, we address the current challenges and future perspectives for the designed construction of hierarchical zeolite catalysts to meet the increasing demands for industrial catalytic applications.