Authors
Haocheng Zhang, Tianyu He, Chuang Liu, Linhai He, Zhaoqi Ye, Kexin Yan, Yifan Zhang, Zhendong Wang, Shutao Xu, Hongbin Zhang, Xiao-Ming Cao, Yahong Zhang, Yi Tang
Published in
Angewandte Chemie (International ed. in English). Pages e5569126. Jul 03, 2026. Epub Jul 03, 2026.
Abstract
The direct synthesis of ultrathin MWW zeolites with precisely controllable aluminum location represents a significant challenge. Herein, we report a sustainable approach using cycloketones as secondary nitrogen-free organic structure-directing agents (NF-OSDAs) to fabricate two-dimensional (2D) MWW zeolites. Cyclobutanone (Cy4) directs the formation of ultrathin nanosheets featuring expanded interlayer spacing and tunable aluminum distribution. We demonstrate that Na+-cycloketone complexes selectively occupy specific pore environments, effectively reducing the population of T6-T7 framework aluminum (AlF) sites and migrating to T2 AlF sites, promoting external Brønsted acidity. The resulting Cy4-MWW catalyst exhibits outstanding performance in bulky-molecule transformations. Mechanistic studies reveal that cycloketones undergo in situ self-condensation to generate dimeric species that function as pivotal structural directors. Their steric presence affects layer thickness and nanosheet packing, whereas their Na+-coordinated forms strongly interact with T2 AlF sites, thereby driving aluminum migration from the confined T6-T7 AlF positions to accessible T2 AlF sites. This strategy exhibits broad versatility across a range of cycloketones (Cy4-Cy10), enabling the concurrent tuning of both the MWW architecture and its aluminum distribution.
PMID:
42397853
Bibliographic data and abstract were imported from PubMed on 04 Jul 2026.
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