The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO | Sciact - CRIS-система Института катализа

The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO Научная публикация

Журнал

Inorganics
, E-ISSN: 2304-6740

Вых. Данные

Год: 2025, Том: 13, Номер: 1, Номер статьи : 8, Страниц : 17 DOI: 10.3390/inorganics13010008

Ключевые слова

MnxCo3-xO4 oxides; solid solutions; synergetic effect; CO oxidation

Авторы

Bulavchenko Olga A. ^1,2 , Rogov Vladimir A. ² , Gerasimov Evgeny Yu. ² , Aydakov Egor E. ¹ , Kremneva Anna M. ¹

Организации

1	Synchrotron Radiation Facility SKIF, Nikolsky Prosp., 1, 630559 Kol'tsovo, Russia
2	Physical Department, Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia

Информация о финансировании (1)

Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)

075-15-2022-263

In this work, the origin of the synergetic effect in mixed MnxCo3-xO4 oxides with the spinel structure in the CO oxidation reaction was tested. A series of MnxCo3-x oxide catalysts were synthesized by the coprecipitation method with further calcination at 600 ◦C and varying manganese content from x = 0 to x = 3. The catalysts were characterized using XRD, TEM, N2 adsorption, TPR, EXAFS, and XPS. The catalytic activity of MnxCo3-x oxide catalysts was tested in CO oxidation reactions. The addition of manganese to cobalt oxide results in the formation of mixed Mn-Co oxides based on a cubic or tetragonal spinel structure, a change in microstructural properties, such as surface area and crystal size, as well as local distortions and a decrease in the surface concentration of Co ions and Co in the octahedral sites in spinel structure; it also decreases catalyst reducibility. For all catalysts, the activity of CO oxidation decreases as follows: Mn0.1Co2.9 > Co3O4~Mn0.3Co2.7 > Mn0.5Co2.5 > MnOx > Mn0.7Co2.3 > Mn0.9Co2.1~Mn1.1Co1.9~Mn2.5Co0.5 > Mn2.9Co0.1 >Mn1.7Co1.3 > Mn2.1Co0.9 > Mn1.3Co1.7~Mn1.5Co1.5~Mn2.3Co0.7. The Mn0.1Co2.9 catalyst displays the best catalytic activity, which is attributed to its small crystal size and the maximum surface ratio between Co3+ and Co2+. A further increase in the manganese content (x > 0.3) provokes drastic changes in the catalytic properties due to a decrease in the cobalt content on the surface and in the volume of mixed oxide, changes in the oxidation states of cations, and structure transformation.

Bulavchenko O.A. , Rogov V.A. , Gerasimov E.Y. , Aydakov E.E. , Kremneva A.M.
The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO
Inorganics. 2025. V.13. N1. 8 :1-17. DOI: 10.3390/inorganics13010008 WOS Scopus OpenAlex СКИФ ID

Поступила в редакцию:	27 нояб. 2024 г.
Принята к публикации:	29 дек. 2024 г.
Опубликована online:	31 дек. 2024 г.
Опубликована в печати:	1 янв. 2025 г.

Web of science:	WOS:001405878400001
Scopus:	2-s2.0-85216210283
OpenAlex:	W4405968925
СКИФ ID:	3699

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