Selective Alkene Epoxidation by Molecular Oxygen in the Presence of Aldehyde and Different Type Catalysts Containing Cobalt Научная публикация
Конференция |
3rd World Congress on Oxidation Catalysis 21-26 сент. 1997 , San Diego |
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Сборник | Proceedings of the 3rd World Congress on Oxidation Catalysis, 21-26 September 1997, San Diego, CA, U.S.A. Сборник, Elsevier B.V.. 1997. 1248 c. ISBN 9780444827722. |
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Журнал |
Studies in Surface Science and Catalysis
ISSN: 0167-2991 |
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Вых. Данные | Год: 1997, Том: 110, Страницы: 947-955 Страниц : 9 DOI: 10.1016/S0167-2991(97)81058-0 | ||||
Ключевые слова | AEROBIC EPOXIDATION; METAL; OLEFINS; OXIDATION; COMPLEXES; METALLOPORPHYRINS; NICKEL(II); MECHANISM; HETEROPOLYANIONS; REACTIVITY | ||||
Авторы |
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Организации |
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Информация о финансировании (1)
1 | Российский фонд фундаментальных исследований | 96-03-34215 |
Реферат:
This chapter discusses a comparative study of the catalytic properties of different type cobalt-containing compounds in alkene epoxidation by dioxygen in the presence of iso-butyraldehyde (IBA) and provides some data that allows clarifying the reaction mechanism and the nature of the catalytic action of cobalt compounds. Here, the catalytic properties of cobalt-containing compounds having different nature have been discussed. These include the simple salt, Co(NO3)2.6H2O, tetra-n-butylammonium salts of PW11CoO593−(PW11CO) and CoW12O40−6(CoW12) heteropolyanions (HPA), CoNaY zeolite, and Co(II) phtalocyanine (CoPc), in alkene epoxidation by the O2/IBA system. It has been found that various alkenes can be converted to the corresponding epoxides with good-to-high selectivity (80%–99%) at complete alkene conversion at ambient conditions. Neither allylic oxidation nor epoxide ring cleavage products were detected for all alkenes tested except for cyclohexene. The nature of catalyst does not considerably affect the selectivity of the epoxidation that depends mainly on the olefin structure. Some decrease of the selectivity was generally observed at high cobalt concentrations. The results obtained in this investigation prove that alkene epoxidation by O2 in the presence of iso-butyraldehyde (IBA) and cobalt catalysts proceeds via radical chain mechanism. Acylperoxy radicals act most likely as the main epoxidizing species although some other species, for example, coordinated to the metal center acylperoxy radicals, may contribute into the epoxidation process when catalysts with low redox potentials are used. Superior catalytic activity of cobalt compounds in alkene epoxidation by O2/IBA system is because of the high ability of cobalt to catalyze the chain branching and promote the chain initiation rather than the ability of cobalt to activate dioxygen via its coordination.
Библиографическая ссылка:
Kholdeeva O.A.
, Khavrutskii I.V.
, Romannikov V.N.
, Tkachev A.V.
, Zamaraev K.I.
Selective Alkene Epoxidation by Molecular Oxygen in the Presence of Aldehyde and Different Type Catalysts Containing Cobalt
В сборнике Proceedings of the 3rd World Congress on Oxidation Catalysis, 21-26 September 1997, San Diego, CA, U.S.A.. – Elsevier B.V.., 1997. – C.947-955. – ISBN 9780444827722. DOI: 10.1016/S0167-2991(97)81058-0 WOS Scopus РИНЦ
Selective Alkene Epoxidation by Molecular Oxygen in the Presence of Aldehyde and Different Type Catalysts Containing Cobalt
В сборнике Proceedings of the 3rd World Congress on Oxidation Catalysis, 21-26 September 1997, San Diego, CA, U.S.A.. – Elsevier B.V.., 1997. – C.947-955. – ISBN 9780444827722. DOI: 10.1016/S0167-2991(97)81058-0 WOS Scopus РИНЦ
Даты:
Опубликована в печати: | 1 янв. 1997 г. |
Опубликована online: | 2 сент. 2007 г. |
Идентификаторы БД:
Web of science | WOS:000071441200093 |
Scopus | 2-s2.0-0346441737 |
РИНЦ | 15055754 |
Chemical Abstracts | 1998:93398 |
Chemical Abstracts (print) | 128:180089 |
OpenAlex | W1593433588 |