RESEARCH PROGRESS ON SOLID-STATE ION EXCHANGEOF TECHNOLOGY FOR ZEOLITE MODIFICATION

Abstract

Abstract: Ion exchange is a crucial technique for precisely tuning the acidity, pore size, and active site distribution of zeolites. Although the traditional liquid ion exchange (LIE) method is widely used, it suffers from issues such as long processing times, large wastewater generation, and low exchange capacity. Enhancing the efficiency of zeolite ion exchange while reducing energy consumption and pollution remains a significant challenge in the field. Solid-state ion exchange (SSIE) offers advantages such as low wastewater production and faster exchange rates, overcoming many limitations of LIE. However, fundamental research on the principles and process optimization of SSIE is still limited. This paper provides a comprehensive discussion of the ion exchange mechanism in SSIE, focusing on the influence of zeolite types, metal types, and thermal treatment conditions on exchange efficiencyas well as the existing challenges. It also offers a detailed comparison of the characteristics of LIE and SSIE, providing valuable insights for future research on green modification methods for zeolites.

Key words: zeolite, solid-state ion exchange, porous material, catalyst modification

References

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