A Novel Approach for the Synthesis of Hierarchical Zeolites with Enhanced Catalytic Performance
Authors: J. Wang, L. Zhang, Y. Liu, H. Chen, X. Li
Hierarchical zeolites combine the intrinsic microporosity of zeolites with additional mesoporosity, offering enhanced mass transport and catalytic activity. In this study, we present a novel synthesis route for hierarchical ZSM-5 zeolites using a dual-template approach with a cationic polymer and a conventional organic structure-directing agent. The resulting materials exhibit well-defined intracrystalline mesopores, high crystallinity, and improved acidity. Catalytic testing in the methanol-to-propylene (MTP) reaction demonstrates significantly enhanced propylene selectivity and prolonged catalyst lifetime compared to conventional ZSM-5. The improved performance is attributed to the reduced diffusion path length and optimized acid site distribution. This work provides a scalable and cost-effective strategy for the design of hierarchical zeolites with superior catalytic properties.
