Effect of the Mechanical Activation of a Mixture of MnCO3 ⋅ mMn(OH)2 ⋅ nH2O and AlOOH as a Stage of the Preparation of a MnOx–Al2O3 Catalyst on Its Phase Composition and Catalytic Activity in CO Oxidation
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Переводная
|
| Журнал |
Kinetics and Catalysis
ISSN: 0023-1584
, E-ISSN: 1608-3210
|
| Вых. Данные |
Год: 2015,
Том: 56,
Номер: 3,
Страницы: 359-368
Страниц
: 10
DOI:
10.1134/S0023158415030015
|
| Авторы |
Afonasenko T.N.
1
,
Bulavchenko O.A.
2,3
,
Knyazheva O.A.
1
,
Baklanova O.N.
1
,
Gulyaeva T.I.
1
,
Trenikhin M.V.
1
,
Tsybulya S.V.
2,3
,
Tsyrulʹnikov P.G.
1
|
| Организации |
| 1 |
Institute of Hydrocarbons Processing, Siberian Branch, Russian Academy of Sciences, Omsk, 644040 Russia
|
| 2 |
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
|
| 3 |
Novosibirsk State University, Novosibirsk, 630090 Russia
|
|
Информация о финансировании (1)
|
1
|
Российский научный фонд
|
14-23-00037
|
The effect of the mechanical activation of a mixture of MnCO3 · mMn(OH)2 · nH2O and AlOOH as a stage in the preparation of a MnO x -Al2O3 catalyst on the characteristics of the resulting samples was studied. It was found that the catalytic activity of MnO x -Al2O3 increased even after mechanical activation for 5 min. It was established that a decrease in the concentration of manganese hydroxocarbonate within the limits of the tested ratios between the components exerted the greatest positive effect of mechanical activation on catalytic activity. This was likely because the dispersion of this compound increased and interactions between the components strengthened in the course of mechanical activation. This was evidenced by a considerable increase in the amount of the α-Al2O3 phase relative to δ-Al2O3 in the catalyst calcined at 950°C. According to the results of temperature-programmed reduction with hydrogen, the formation of a larger number of catalytically active, fine MnO x particles after high-temperature heat treatment was responsible for the strengthening of interactions between the initial components upon mechanical activation. Transmission electron-microscopic data also indicated an increase in the dispersity of manganese oxide particles with the use of mechanical activation as a stage of the preparation of the MnO x -Al2O3 catalyst.