Generating Disk-Shaped MTW Zeolite with Reduced Channel Length Using Polycation Structure-Directing Agent for Hydroisomerization of N-Dodecane
The development of hierarchically structured zeolites to mitigate diffusion limitations and improve catalytic performance constitutes a focus of current research. In this study, we present the synthesis of hierarchical disk-shapedMTWzeolite (ZSM-12-P) with shortened channel length using polycation [-C5H9N+C10H10N+C5H9-C3H6-]n[Br−]2n(PDIP) as an organic structure-directing agent (OSDA). The ZSM-12-P zeolite forms disk-shaped structures with thicknesses ranging from 140 to 160 nm and exhibits rotational intergrowth. These structures are composed of interconnected nanocrystalline domains that form mesopores accessible from the outer surface, while the microporous channels extend along the thickness direction. In addition, the polycationic OSDA possesses strong interaction with framework andMTWstructure-directing ability, enabling the successful synthesis of the Al-rich ZSM-12-P. Owing to its strong acidity and improved diffusion property, the Pt/HZSM-12-P catalyst demonstrates enhanced catalyticn-dodecane hydroisomerization activity and isomer yield.
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