Oxidation of Lower Alkenes by α-Oxygen (FeIII–O•−)α on the FeZSM-5 Surface: The Epoxidation or the Allylic Oxidation? Научная публикация
| Журнал |
Molecular Catalysis
ISSN: 2468-8231 |
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| Вых. Данные | Год: 2017, Том: 443, Страницы: 43-51 Страниц : 9 DOI: 10.1016/j.mcat.2017.09.017 | ||||||
| Ключевые слова | DFT, N2O oxidant, Oxygen anion radicals, Propylene epoxidation, α-oxygen | ||||||
| Авторы |
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| Организации |
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Информация о финансировании (2)
| 1 | Российский фонд фундаментальных исследований | 15-03-03218 |
| 2 | Федеральное агентство научных организаций России | 0303-2016-0006 (V.44.1.6) |
Реферат:
Elsevier B.V. Reactions of anion-radical α-oxygen (FeIII–O•−)α with propylene and 1-butene on sodium-modified FeZSM-5 zeolites were studied in the temperature range from −60 to 25 °C. Products were extracted from the zeolite surface and identified. It was found that main reaction pathway was the epoxides formation. Selectivity for epoxides at −60 °C was 59–64%. Other products were formed as a result of secondary transformations of epoxides on the zeolite surface. According to IR spectroscopy, the oxidation of propylene over the entire temperature range and 1-butene at −60 °C were not accompanied by the formation of (FeIII–OH)α groups, in distinction to methane oxidation. This testifies that hydrogen abstraction does not occur. In case of 1-butene reaction with α-oxygen at 25 °C, hydrogen abstraction occurred but was insignificant, ca 7%. According to DFT calculation ferraoxetane intermediate formation is preferable over hydrogen abstraction. Following decomposition of this intermediate leads to the propylene oxide (PO) formation. The results may be relevant to the low selectivity problem of the silver catalyst in propylene epoxidation and raise doubts about the presently accepted mechanism explaining an adverse effect of allylic hydrogen.
Библиографическая ссылка:
Starokon E.V.
, Malykhin S.E.
, Parfenov M.V.
, Zhidomirov G.M.
, Kharitonov A.S.
Oxidation of Lower Alkenes by α-Oxygen (FeIII–O•−)α on the FeZSM-5 Surface: The Epoxidation or the Allylic Oxidation?
Molecular Catalysis. 2017. V.443. P.43-51. DOI: 10.1016/j.mcat.2017.09.017 WOS Scopus РИНЦ CAPlusCA OpenAlex
Oxidation of Lower Alkenes by α-Oxygen (FeIII–O•−)α on the FeZSM-5 Surface: The Epoxidation or the Allylic Oxidation?
Molecular Catalysis. 2017. V.443. P.43-51. DOI: 10.1016/j.mcat.2017.09.017 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 14 апр. 2017 г. |
| Принята к публикации: | 16 сент. 2017 г. |
| Опубликована online: | 10 нояб. 2017 г. |
| Опубликована в печати: | 1 дек. 2017 г. |
Идентификаторы БД:
| Web of science: | WOS:000416616000005 |
| Scopus: | 2-s2.0-85033391527 |
| РИНЦ: | 31051863 |
| Chemical Abstracts: | 2018:312472 |
| Chemical Abstracts (print): | 168:346638 |
| OpenAlex: | W2767322264 |