Phase Transformations in the Thermoactivated MnOx–Al2O3 Catalytic System Научная публикация
| Журнал |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169 |
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| Вых. Данные | Год: 2002, Том: 179, Номер: 1-2, Страницы: 213-220 Страниц : 8 DOI: 10.1016/S1381-1169(01)00327-2 | ||||
| Ключевые слова | Calcination, MnOx/Al2O3 catalyst, Phase transformation, TEM, XPS, XRD | ||||
| Авторы |
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| Организации |
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Информация о финансировании (1)
| 1 | Российский фонд фундаментальных исследований | 99-03-32135 |
Реферат:
The phenomenon of the sharp increase of activity in reactions of deep oxidation found for the manganese oxide–alumina system calcined at 900–1000 ◦C was named as thermoactivation effect. This effect was shown to be associated with phase transformations in this system. Peculiarities of phase transformations in the MnOx /Al2O3 system after its calcination at 950 ◦C for 1–10 h were studied with XRD, TEM, XPS methods; the catalysts activity in deep oxidation of n-pentane was measured in a flow-circuit setup. It was found that a set of phase transformations occurred in the system, starting from the formation of the metastable nonstoichiometric manganese–alumina cubic spinel (after 1–2 h calcination) and nonequilibrium solid solution of Mn3+ ions in the structure of -Al2O3 which decomposes producing high-temperature aluminas modified by manganese ions and particles of imperfect -Mn3O4 phase doped with aluminium ions. Increase of the calcination time to 10 h and more results in the formation of biphasic system composed of -Al2O3 and nanocrystalline -Mn3O4 modified by Al3+ ions.
These transformations are associated with the maximum activity showed by catalysts calcined for 5–6 h in the reaction of n-pentane combustion.
Библиографическая ссылка:
Tsyrulnikov P.G.
, Tsybulya S.V.
, Kryukova G.N.
, Boronin A.I.
, Koscheev S.V.
, Starostina T.G.
, Bubnov A.V.
, Kudrya E.N.
Phase Transformations in the Thermoactivated MnOx–Al2O3 Catalytic System
Journal of Molecular Catalysis A: Chemical. 2002. V.179. N1-2. P.213-220. DOI: 10.1016/S1381-1169(01)00327-2 WOS Scopus РИНЦ CAPlusCA OpenAlex
Phase Transformations in the Thermoactivated MnOx–Al2O3 Catalytic System
Journal of Molecular Catalysis A: Chemical. 2002. V.179. N1-2. P.213-220. DOI: 10.1016/S1381-1169(01)00327-2 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 19 апр. 2001 г. |
| Принята к публикации: | 17 авг. 2001 г. |
| Опубликована online: | 24 янв. 2002 г. |
| Опубликована в печати: | 18 февр. 2002 г. |
Идентификаторы БД:
| Web of science: | WOS:000173811100025 |
| Scopus: | 2-s2.0-0037127512 |
| РИНЦ: | 13396198 |
| Chemical Abstracts: | 2002:93494 |
| Chemical Abstracts (print): | 136:343139 |
| OpenAlex: | W1790522872 |