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 |
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| 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 |
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| Организации |
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Информация о финансировании (1)
| 1 | Российский научный фонд | 22-13-00029 |
Реферат:
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.
Библиографическая ссылка:
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 РИНЦ CAPlus OpenAlex
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 РИНЦ CAPlus OpenAlex
Даты:
| 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. |
Идентификаторы БД:
| Web of science: | WOS:001317069400001 |
| Scopus: | 2-s2.0-85204640647 |
| РИНЦ: | 74577078 |
| Chemical Abstracts: | 2024:2001409 |
| OpenAlex: | W4402625792 |
Цитирование в БД:
Пока нет цитирований