Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study Full article
| Journal |
Catalysts
ISSN: 2073-4344 |
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| Output data | Year: 2021, Volume: 11, Number: 12, Article number : 1446, Pages count : 13 DOI: 10.3390/catal11121446 | ||||
| Tags | Bimetallic catalysts; Core-shell structure; High-angle annular dark-field imaging scanning transmission electron microscopy (HAADF STEM); In situ EXAFS spectroscopy; Total methane oxidation | ||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Ministry of Science and Higher Education of the Russian Federation | ГЗ-2021-2023 |
| 2 | Russian Foundation for Basic Research | 20-33-70124 |
Abstract:
In this study, 3%Pd/Al2O3, 3%Pt/Al2O3 and bimetallic (1%Pd + 2%Pt)/Al2O3 catalysts were examined in the total oxidation of methane in a temperature range of 150–400 °C. The evolution of the active component under the reaction conditions was studied by transmission electron microscopy and in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. It was found that the platinum and bimetallic palladium-platinum catalysts are more stable against sintering than the palladium catalysts. For all the catalysts, the active component forms a “core-shell” structure in which the metallic core is covered by an oxide shell. The “core-shell” structure for the platinum and bimetallic palladium-platinum catalysts is stable in the temperature range of 150–400 °C. However, in the case of the palladium catalysts the metallic core undergoes the reversible oxidation at temperatures above 300 °C and reduced to the metallic state with the decrease in the reaction temperature. The scheme of the active component evolution during the oxidation of methane is proposed and discussed. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Cite:
Saraev A.A.
, Yashnik S.A.
, Gerasimov E.Y.
, Kremneva A.M.
, Vinokurov Z.S.
, Kaichev V.V.
Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study
Catalysts. 2021. V.11. N12. 1446 :1-13. DOI: 10.3390/catal11121446 WOS Scopus РИНЦ AN OpenAlex publication_identifier_short.sciact_skif_identifier_type
Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study
Catalysts. 2021. V.11. N12. 1446 :1-13. DOI: 10.3390/catal11121446 WOS Scopus РИНЦ AN OpenAlex publication_identifier_short.sciact_skif_identifier_type
Dates:
| Submitted: | Nov 10, 2021 |
| Accepted: | Nov 26, 2021 |
| Published online: | Nov 27, 2021 |
| Published print: | Dec 1, 2021 |
Identifiers:
| Web of science: | WOS:000735920200001 |
| Scopus: | 2-s2.0-85119977613 |
| Elibrary: | 47535818 |
| Chemical Abstracts: | 2022:90297 |
| OpenAlex: | W3215850630 |
| publication_identifier.sciact_skif_identifier_type: | 1474 |