In situ 1H and 13C MAS NMR Study of the Mechanism of H/D Exchange for Deuterated Propane Adsorbed on H-ZSM-5 Научная публикация
| Журнал |
Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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| Вых. Данные | Год: 2005, Том: 235, Номер: 1, Страницы: 221-228 Страниц : 8 DOI: 10.1016/j.jcat.2005.08.002 | ||||
| Ключевые слова | 13C MAS NMR, 1H MAS NMR, H-ZSM-5 zeolite, H/D exchange, In situ spectroscopy, Kinetics, Mechanism, Propane | ||||
| Авторы |
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| Организации |
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Информация о финансировании (4)
| 1 | Российский фонд фундаментальных исследований | 04-03-32372 |
| 2 | German Research Foundation | FR 902/15 |
| 3 | Региональный общественный Фонд содействия отечественной науке | |
| 4 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | 03-51-5286 |
Реферат:
The kinetics of hydrogen exchange between the molecules of propane-d8, propane-1,1,1,3,3,3-d6, propane-2,2-d2, and Brönsted acid sites of the zeolite H-ZSM-5 have been monitored in situ by 1H MAS NMR spectroscopy in the temperature range of 230–280 °C. The intramolecular hydrogen transfer was estimated by in situ 13C MAS NMR spectroscopy of the kinetics of 13C-label scrambling in adsorbed propane-2-13C. The hydrogen exchange was found to occur directly between methyl or methylene groups of the alkane and the zeolite acid sites via a pentacoordinated carbonium ion. The exchange with the methyl groups is faster than that with the methylene group. This accounts for the earlier observed regioselectivity of the hydrogen exchange for propane on acidic zeolites (J. Am. Chem. Soc. 117 (1995) 1135). The intramolecular hydrogen transfer between methyl and methylene groups is one order of magnitude slower than the hydrogen exchange of the both groups with the zeolite acid sites.
Библиографическая ссылка:
Stepanov A.G.
, Arzumanov S.S.
, Luzgin M.V.
, Ernst H.
, Freude D.
, Parmon V.N.
In situ 1H and 13C MAS NMR Study of the Mechanism of H/D Exchange for Deuterated Propane Adsorbed on H-ZSM-5
Journal of Catalysis. 2005. V.235. N1. P.221-228. DOI: 10.1016/j.jcat.2005.08.002 WOS Scopus РИНЦ CAPlusCA OpenAlex
In situ 1H and 13C MAS NMR Study of the Mechanism of H/D Exchange for Deuterated Propane Adsorbed on H-ZSM-5
Journal of Catalysis. 2005. V.235. N1. P.221-228. DOI: 10.1016/j.jcat.2005.08.002 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 19 апр. 2005 г. |
| Принята к публикации: | 7 авг. 2005 г. |
| Опубликована online: | 7 сент. 2005 г. |
| Опубликована в печати: | 1 окт. 2005 г. |
Идентификаторы БД:
| Web of science: | WOS:000232147500022 |
| Scopus: | 2-s2.0-24944497188 |
| РИНЦ: | 13478403 |
| Chemical Abstracts: | 2005:1009268 |
| Chemical Abstracts (print): | 143:439878 |
| OpenAlex: | W2111076984 |