H/D Exchange of Isobutane on In-Modified BEA Zeolite Investigated by 1H MAS NMR | Sciact - CRIS-система Института катализа

H/D Exchange of Isobutane on In-Modified BEA Zeolite Investigated by 1H MAS NMR Научная публикация

Журнал

The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455

Вых. Данные

Год: 2024, Том: 128, Номер: 39, Страницы: 16491-16500 Страниц : 10 DOI: 10.1021/acs.jpcc.4c04998

Ключевые слова

Nuclear magnetic resonance spectroscopy; Reaction intermediates; Reaction kinetics

Авторы

Arzumanov Sergei S. ¹ , Gabrienko Anton A. ¹ , Toktarev Alexander V. ¹ , Freude Dieter ² , Stepanov Alexander G. ¹

Организации

1	Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
2	Faculty of Physics and Earth System Sciences, Leipzig University, 04103 Leipzig, Germany

Информация о финансировании (1)

Российский научный фонд

22-13-00029

With the aim of discovering the effect of indium species on the protolytic activation of isobutane by Brønsted acid sites (BAS), the kinetics of H/D hydrogen exchange between isobutane-d10 and BAS of the InO+/H-BEA zeolite was monitored by 1H MAS NMR spectroscopy. The exchange has been established to occur exclusively between methyl groups of isobutane-d10 and BAS and demonstrates a significant induction period. Dehydrogenation of isobutane to isobutene is observed alongside the H/D exchange in the alkane. Kinetics of protium transfer from BAS to both deuterated isobutane and isobutene are interpreted in terms of the indirect cyclic mechanism of H/D exchange with isobutene as a key intermediate. It is inferred that indium sites perform isobutane dehydrogenation and strongly retain isobutene formed. This accounts for the prolonged induction period in the H/D exchange reaction kinetics. Indium sites located in the zeolite pores decelerate protium transfer from zeolite BAS to isobutane via an indirect H/D exchange mechanism and, contrary to the case with linear alkanes, are not able to facilitate the direct hydrogen exchange between BAS and methyl groups in isobutane.

Arzumanov S.S. , Gabrienko A.A. , Toktarev A.V. , Freude D. , Stepanov A.G.
H/D Exchange of Isobutane on In-Modified BEA Zeolite Investigated by 1H MAS NMR
The Journal of Physical Chemistry C. 2024. V.128. N39. P.16491-16500. DOI: 10.1021/acs.jpcc.4c04998 WOS Scopus CAPlus OpenAlex

Поступила в редакцию:	25 июл. 2024 г.
Принята к публикации:	11 сент. 2024 г.
Опубликована online:	19 сент. 2024 г.
Опубликована в печати:	3 окт. 2024 г.

Web of science:	WOS:001317069400001
Scopus:	2-s2.0-85204640647
Chemical Abstracts:	2024:2001409
OpenAlex:	W4402625792

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