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Phase Transformations in the Thermoactivated MnOx–Al2O3 Catalytic System Научная публикация

Журнал Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169
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 Tsyrulnikov P.G. 1 , Tsybulya S.V. 2 , Kryukova G.N. 2 , Boronin A.I. 2 , Koscheev S.V. 2 , Starostina T.G. 2 , Bubnov A.V. 1 , Kudrya E.N. 1
Организации
1 Omsk Branch of Boreskov Institute of Catalysis, Neftezavodskaya Str. 54, Omsk 644040, Russia
2 Boreskov Institute of Catalysis, pr. Lavrentieva 5, Novosibirsk 630090, Russia

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
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
Цитирование в БД:
БД Цитирований
Web of science 28
Scopus 29
РИНЦ 32
OpenAlex 27
Альметрики: