Self-Regeneration Effect of Three-Way Catalysts during Thermal Aging Procedure Full article
Journal |
Catalysts
ISSN: 2073-4344 |
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Output data | Year: 2020, Volume: 10, Number: 11, Article number : 1257, Pages count : 11 DOI: 10.3390/catal10111257 | ||||
Tags | three-way catalysts; rhodium; engine bench; high-temperature aging; self-regeneration | ||||
Authors |
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Affiliations |
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Funding (1)
1 | Federal Agency for Scientific Organizations | 0303-2016-0014 |
Abstract:
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.
Cite:
Alikin E.A.
, Denisov S.P.
, Bubnov K.V.
, Vedyagin A.A.
Self-Regeneration Effect of Three-Way Catalysts during Thermal Aging Procedure
Catalysts. 2020. V.10. N11. 1257 :1-11. DOI: 10.3390/catal10111257 WOS Scopus РИНЦ
Self-Regeneration Effect of Three-Way Catalysts during Thermal Aging Procedure
Catalysts. 2020. V.10. N11. 1257 :1-11. DOI: 10.3390/catal10111257 WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Submitted: | Oct 5, 2020 |
Accepted: | Oct 26, 2020 |
Published online: | Oct 30, 2020 |
Published print: | Nov 1, 2020 |
Identifiers:
Web of science | WOS:000592848600001 |
Scopus | 2-s2.0-85096562044 |
Elibrary | 45164590 |
Chemical Abstracts | 2020:2326316 |
OpenAlex | W3096244763 |