The Formation of Mn-Ce-Zr Oxide Catalysts for CO and Propane Oxidation: The Role of Element Content Ratio
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Catalysts
, E-ISSN: 2073-4344
|
| Вых. Данные |
Год: 2023,
Том: 13,
Номер: 1,
Номер статьи
: 211,
Страниц
: 17
DOI:
10.3390/catal13010211
|
| Ключевые слова |
MnxZryCe1-x-yO2 solid solution; CO oxidation; propane oxidation |
| Авторы |
Afonasenko Tatyana N.
1
,
Yurpalova Daria V.
1
,
Vinokurov Zakhar S.
2,3
,
Saraev Andrey A.
2,3
,
Aidakov Egor E.
2
,
Konovalova Valeriya P.
2
,
Rogov Vladimir A.
2
,
Bulavchenko Olga A.
2
|
| Организации |
| 1 |
Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis,
Neftezavodskaya St., 54, 644040 Omsk, Russia
|
| 2 |
Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090 Novosibirsk, Russia
|
| 3 |
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS,
Nikol’skiy Prospekt 1, 630559 Kol’tsovo, Russia
|
|
Информация о финансировании (1)
|
1
|
Российский научный фонд
|
21-73-10218 (122051600004-3)
|
The MnOх-ZrO2-CeO2 oxide catalysts were synthesized by co-precipitation method with varying (1) Zr/Zr + Ce molar ratio at constant manganese content of 0.3; (2) manganese content at constant Zr/Ce molar ratio of 1; (3) Mn/Mn + Zr molar ratio at constant Ce content of 0.5. Catalysts are characterized by XRD, N2 adsorption, TPR, and XPS. The catalytic activity of all the series was tested in the CO and propane oxidation reactions. In contrast to the variation of the manganese content, the Zr/Zr + Ce molar ratio does not significantly affect the catalytic properties. The dependence of the catalytic activity in CO oxidation on the manganese content has a «volcano» shape, and the best catalytic performance is exhibited by the catalyst with Mn/(Zr + Ce) = 1. In the case of propane oxidation reaction, there is «sigma» like dependence, activity increases with increase of Mn/(Mn + Zr + Ce) molar ratio up to 0.3, stabilizing with a further increase in the manganese content. XRD and XPS have shown that with an increase of the Mn concentration in the MnOx-ZrO2 -CeO2 catalysts, the amount of crystalline manganese oxides such as Mn2O3 and Mn3O4, as well as the surface concentration of Mn cations, increases. While the content of MnxZryCe1-x-yO2 solid solution decreases, the concentration of manganese cations (x) in volume of MnxZryCe1-x-yO2 mixed oxide grows. The maximum activity in CO oxidation corresponds to the balance between the amount of the solid solution and the concentration of manganese cations in the volume of mixed oxide. The propane oxidation reaction is less sensitive to the state of manganese ion rather than to its amount. In this case, a decrease in the content of the MnxZryCe1-x-yO2 solid solution with increase in
manganese amount in catalyst is compensated by an increase in content of crystalline manganese
oxides and the surface concentration of manganese.