Preparation of Hierarchical ZSM-5 Sheets with Diverse Quaternary Ammonium Hydroxides as Etching Agents

作者：Hanxuan Wang, Xiao Fan, Yi Liu, Weijun Xu, Tianli Zhou, Jinming Lu, Yi Liu · 发表于：Inorganic Chemistry · 年份：2025 · DOI：10.1021/acs.inorgchem.5c05730 · 被引用次数：2 · 研究领域：Zeolite Catalysis and Synthesis、Mesoporous Materials and Catalysis、Catalysis for Biomass Conversion

To address the inherent diffusion limitations in zeolites, the preparation of hierarchical zeolite sheets with a lower internal diffusion resistance is highly desired. Herein, we present a facile strategy for producing hierarchical ZSM-5 zeolite sheets (Z5-HSs) via alkaline etching of the coffin-shaped bulk counterparts with diverse quaternary ammonium hydroxides (i.e., TMAOH, TEAOH, TPAOH, and TBAOH). Our results demonstrate that ZSM-5 sheets with a hierarchical structure could be obtained by rational control of the initial Si/Al ratio, irrespective of the etchant variety employed. The final Si/Al ratio of the obtained sheets can be tuned in the range of 11–55. Furthermore, our results reveal two distinct etching mechanisms governed by the etchant type: an “outside–in” process for TMA +, driven by its strong surface affinity, and a dissolution–recrystallization pathway for the larger TEA +, TPA +, and TBA + cations. To the best of our knowledge, this work demonstrates for the first time that the synergistic effect of framework aluminum enables weakly templating TBAOH to successfully form uniform sheets, a result not achievable with pure-silica zeolites. These findings highlight the critical interplay between etchant choice and zeolite composition and significantly expand the toolbox for the precise microstructural tailoring of zeolites.