AN in situ13C MAS NMR study of the zeolite-catalyzed alkylation of polar aromatics Научная публикация
| Конференция |
14th International Zeolite Conference 25-30 апр. 2004 , Cape Town |
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| Журнал |
Studies in Surface Science and Catalysis
ISSN: 0167-2991 |
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| Вых. Данные | Год: 2004, Том: 154. Part C, Страницы: 2221-2227 Страниц : 7 DOI: 10.1016/s0167-2991(04)80479-8 | ||||||
| Авторы |
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Реферат:
In situ13C MAS NMR was applied to study the mechanisms of the N-alkylation of aniline and of the O-alkylation of phenol with methanol on acidic (H-Y) and basic (CsOH/CsNa-Y) zeolite Y catalysts. Methanol-13C was the labeled reactant. The results point to similar mechanisms of the N- and O-alkylation on Brønsted acid sites including a dehydration of methanol towards dimethyl ether (DME) or surface methoxy groups, which further react with aniline to N-methyalnilinium, N,N-dimethylanilinium, and N,N, N-trimethylanilinium cations or a direct reaction of phenol and methanol towards anisole. At variance, different mechanistic pathways were observed on basic zeolite Y: N-alkylation is shown to proceed via methanol dehydrogenation leading to the formation of formaldehyde species responsible for further methylation, while O-alkylation includes the formation of phenolate ions initiating the alkylation reaction.
Библиографическая ссылка:
Ivanova I.I.
, Pomakhina E.B.
, Borodina I.B.
, Rebrov A.I.
, Wang W.
, Weitkamp J.
, Hunger M.
AN in situ13C MAS NMR study of the zeolite-catalyzed alkylation of polar aromatics
Studies in Surface Science and Catalysis. 2004. V.154. Part C. P.2221-2227. DOI: 10.1016/s0167-2991(04)80479-8 Scopus OpenAlex
AN in situ13C MAS NMR study of the zeolite-catalyzed alkylation of polar aromatics
Studies in Surface Science and Catalysis. 2004. V.154. Part C. P.2221-2227. DOI: 10.1016/s0167-2991(04)80479-8 Scopus OpenAlex
Идентификаторы БД:
| Scopus: | 2-s2.0-11844249332 |
| OpenAlex: | W1536693421 |