The Origin of the Size Effect in the Oxidation of CO on Supported Palladium Nanoparticles Full article
| Journal |
Catalysts
ISSN: 2073-4344 |
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| Output data | Year: 2023, Volume: 13, Number: 11, Article number : 1435, Pages count : 9 DOI: 10.3390/catal13111435 | ||||
| Tags | heterogeneous catalysis; size effect; nanoparticles; palladium; CO oxidation | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 075-15-2022-263 |
Abstract:
Two Pd/TiO2 catalysts with mean particle sizes of 1 and 3 nm were prepared and tested in the low-temperature oxidation of CO. It was found that the first catalyst with higher dispersion is more active. Turnover frequencies varied for these catalysts by almost six times. In contrast, the apparent activation energy of the oxidation of CO on the catalyst with smaller Pd nanoparticles was estimated at 76 kJ/mol, and for the catalyst with larger Pd nanoparticles at 58 kJ/mol. According to in situ XANES studies, the particle size effect originates from the oxidation of small palladium nanoparticles under reaction conditions, whereas larger nanoparticles are stable and consist of palladium atoms mainly in the metallic state. Palladium oxide is more active in the low-temperature oxidation of CO than metallic palladium. This means that the origin of size-dependent activity of Pd nanoparticles in the low-temperature oxidation of CO is associated with the change in the chemical composition of nanoparticles that leads to a change in the reaction mechanism and, as a result, in their activity.
Cite:
Kaichev V.V.
, Saraev A.A.
, Fedorov A.V.
, Gerasimov E.Y.
The Origin of the Size Effect in the Oxidation of CO on Supported Palladium Nanoparticles
Catalysts. 2023. V.13. N11. 1435 :1-9. DOI: 10.3390/catal13111435 WOS Scopus РИНЦ AN OpenAlex
The Origin of the Size Effect in the Oxidation of CO on Supported Palladium Nanoparticles
Catalysts. 2023. V.13. N11. 1435 :1-9. DOI: 10.3390/catal13111435 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Oct 1, 2023 |
| Accepted: | Nov 7, 2023 |
| Published print: | Nov 13, 2023 |
| Published online: | Nov 13, 2023 |
Identifiers:
| Web of science: | WOS:001108145200001 |
| Scopus: | 2-s2.0-85178295433 |
| Elibrary: | 55927580 |
| Chemical Abstracts: | 2023:2493146 |
| OpenAlex: | W4388651458 |