The Catalytic Performance of CO Oxidation over MnOx-ZrO2 Catalysts: The Role of Synthetic Routes
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
: 57,
Страниц
: 16
DOI:
10.3390/catal13010057
|
| Ключевые слова |
catalyst; CO oxidation; manganese oxide; fluorite; solid solution; zirconia |
| Авторы |
Bulavchenko Olga A.
1,2
,
Konovalova Valeriya P.
1,2
,
Saraev Andrey A.
1,2
,
Kremneva Anna M.
1
,
Rogov Vladimir A.
1,2
,
Gerasimov Evgeny Yu.
1,2
,
Afonasenko Tatyana N.
3
|
| Организации |
| 1 |
Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave., 5, Novosibirsk 630090, Russia
|
| 2 |
Department of Physics, Novosibirsk State University, Pirogova, 2, Novosibirsk 630090, Russia
|
| 3 |
Center of New Chemical Technologies, Boreskov Institute of Catalysis,
Neftezavodskaya 54, Omsk 644040, Russia
|
|
MnOx‐ZrO2 catalysts prepared by co‐precipitation and vacuum impregnation were calcined
at 400–800 °C and characterized by powder X‐ray diffraction, textural studies, high‐resolution
transmission electron microscopy, temperature‐programmed reduction, X‐ray absorption near edge
structure, and X‐ray photoelectron spectroscopy. The catalytic activity was tested in the CO oxidation
reaction. The activity of the co‐precipitated samples exceeds that of the catalysts prepared by
vacuum impregnation. The characterization studies showed that the nature of the active component
for the catalysts obtained by co‐precipitation differs from that of the catalysts obtained by impregnation.
In the impregnation series, the most active catalyst was obtained at a temperature of 400 °С;
its increased activity is due to the formation of MnO2 oxide nanoparticles containing Mn4+ and lowtemperature
reducibility. An increase in the synthesis temperature leads to the formation of less
active Mn2O3, catalyst sintering, and, accordingly, deterioration of the catalytic properties. In the
case of co‐precipitation, the most active CO oxidation catalysts are formed by calcination at 650–700
°C in air. In this temperature interval, on the one hand, a MnyZr1‐yO2‐x solid solution is formed, and
on the other hand, a partial separation of mixed oxide begins with the formation of highly dispersed
and active MnOx. A further increase in temperature to 800 °C leads to complete decomposition of
the solid solution, the release of manganese cations into Mn3O4, and a drop in catalytic activity.