Direct Identification of Zeolite Beta Polymorphs by Solid-State 29Si Nuclear Magnetic Resonance Spectroscopy

Авторы: Kolyagin Yury G., Yakimov Alexander V., Zasukhin Dmitry S., Ivanova Irina I.
Журнал: Journal of Physical Chemistry Letters
Год издания: 2022
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 10793
Последняя страница: 10798
DOI: 10.1021/acs.jpclett.2c02837
Аннотация: Stacking disorder and polymorphism in zeolite and zeolite-like materials hinder their structural characterization. In this work, we propose an advanced approach based on applying “pure shift” solid-state 29Si nuclear magnetic resonance (NMR) spectroscopy for the structural investigation of zeolitic materials containing intergrown polymorphs. The approach developed in the case study of zeolite beta allows for the resolution of 21 29Si signals, attributing them to nonequivalent T sites in polymorphs A, B, and C, reconstruction of individual 29Si magic angle spinning NMR spectra for each polymorph, and determination of the polymorph composition with higher accuracy than X-ray diffraction. The results reveal that two widely used synthetic routes for zeolite beta, alkaline and fluoride synthesis, lead to different polymorph compositions. These findings indicate that “pure shift” solid-state 29Si NMR can serve as a superior tool for the elucidation of polymorphism in zeolites.
Добавил в систему: Колягин Юрий Геннадьевич

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