Tuning the Framework Al Distribution of ZSM-5 by Sn(IV) to Enhance the Catalytic Performance in 1-Hexene Cracking

Regulating the distribution of framework Al in zeolite is an effective strategy for enhancing the catalyst performance in propylene production through olefin cracking. In this study, the framework Al distribution was controlled by incorporating Sn into the ZSM-5 framework and investigating its impact on the 1-hexene cracking reaction. Comprehensive characterization techniques revealed that although the introduction of Sn led to a decrease in zeolite crystallinity and introduced additional metal L-acids, it resulted in a more uniform distribution of aluminum species and reduced intersectional aluminum species content. The incorporation of Sn into the ZSM-5 framework exhibited improved propylene selectivity and decreased aromatic selectivity in the 1-hexene cracking reactions.