Direct Observation of Tin in Different T-Sites of Sn-BEA by One- and Two-Dimensional 119Sn MAS NMR Spectroscopyстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.

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[1] Direct observation of tin in different t-sites of sn-bea by one- and two-dimensional 119sn mas nmr spectroscopy / Y. G. Kolyagin, A. V. Yakimov, T. Søren et al. // Journal of Physical Chemistry Letters. — 2018. — Vol. 9, no. 13. — P. 3738–3743. The direct and quantitative identification of active sites is crucial for the development of zeolite catalysts and their implementation in industry. Herein we report on the application of one-dimensional 119Sn direct polarization (DP) and rotational echo double-resonance (REDOR) and two-dimensional 119Sn magic-angle tuning (MAT) NMR spectroscopy for the identification of different Sn sites in fully dehydrated Sn-BEA zeolite. It is demonstrated that 119Sn magic-angle spinning (MAS) NMR techniques, modified by Carr–Purcell–Meiboom–Gill (CPMG) echo-train acquisition allow to resolve three groups of NMR signals, which can be attributed to three groups of nonequivalent T-sites based on the existing theoretical predictions: (I) T9, T4, and T3; (II) T2, T1, and T8; and (III) T7, T5, and T6. Results suggest that the sites attributed to group III are the most populated in Sn-BEA samples obtained via the fluoride route. The attribution of NMR lines to different T-sites in the structure of BEA allows for the establishment of structure–reactivity relationship and therefore for further improvement of Sn-BEA catalysts. [ DOI ]

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