Self-Regeneration Effect of Three-Way Catalysts during Thermal Aging Procedure
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Catalysts
ISSN: 2073-4344
|
| Вых. Данные |
Год: 2020,
Том: 10,
Номер: 11,
Номер статьи
: 1257,
Страниц
: 11
DOI:
10.3390/catal10111257
|
| Ключевые слова |
three-way catalysts; rhodium; engine bench; high-temperature aging; self-regeneration |
| Авторы |
Alikin Evgeny A.
1
,
Denisov Sergey P.
1
,
Bubnov Konstantin V.
1
,
Vedyagin Aleksey A.
2
|
| Организации |
| 1 |
Research & Development Department, Ecoalliance Limited Liability Company, Novouralsk 624131, Russia
|
| 2 |
Department of Materials Science and Functional Materials, Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russia
|
|
Информация о финансировании (1)
|
1
|
Федеральное агентство научных организаций России
|
0303-2016-0014
|
One of the most important features of the three-way catalysts is their long-term stability. However, quite often, promising catalytic compositions with excellent activity become deactivated after a relatively short period of exploitation due to various reasons. Therefore, a study on the onboard regeneration of the deactivated three-way catalysts remains its actuality. The present work is mainly focused on the self-regeneration effect of the rhodium-containing component. Aging of the catalysts in the standard and model engine braking regimes revealed the difference in the catalytic performance. Deactivated rhodium species turned to the active state as a result of rapid cooling in air flow from 1200 to 600 °C. The regenerated catalyst shows improved activity towards NOx reduction and, therefore, widened operation window, which indicates higher accessibility of the rhodium species. X-ray diffraction analysis of the aged catalysts does not reveal any noticeable phase changes. Contrary, significant changes in the Rh oxidation state were registered by X-ray photoelectron spectroscopy. The observed effect opens new horizons for the development of the onboard purification systems with prolonged exploitation lifetime.