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- Title
Unraveling distinct effects between CuO<sub>x</sub> and PtCu alloy sites in Pt−Cu bimetallic catalysts for CO oxidation at different temperatures.
- Authors
Li, Yunan; Guo, Lingling; Du, Meng; Tian, Chen; Zhao, Gui; Liu, Zhengwu; Liang, Zhenye; Hou, Kunming; Chen, Junxiang; Liu, Xi; Jiang, Luozhen; Nan, Bing; Li, Lina
- Abstract
In situ exploration of the dynamic structure evolution of catalysts plays a key role in revealing reaction mechanisms and designing efficient catalysts. In this work, PtCu/MgO catalysts, synthesized via the co-impregnation method, outperforms monometallic Pt/MgO and Cu/MgO. Utilizing quasi/in-situ characterization techniques, it is discovered that there is an obvious structural evolution over PtCu/MgO from PtxCuyOz oxide cluster to PtCu alloy with surface CuOx species under different redox and CO oxidation reaction conditions. The synergistic effect between PtCu alloy and CuOx species enables good CO oxidation activity through the regulation of CO adsorption and O2 dissociation. At low temperatures, CO oxidation is predominantly catalyzed by surface CuOx species via the Mars-van Krevelen mechanism, in which CuOx can provide abundant active oxygen species. As the reaction temperature increases, both surface CuOx species and PtCu alloy collaborate to activate gaseous oxygen, facilitating CO oxidation mainly through the Langmuir-Hinshelwood mechanism. This study reveals the structural evolution of PtCu/MgO catalysts from a PtCu alloy to a PtCu alloy with CuOx under redox conditions which is found to exhibit distinct effects between CuOx and PtCu alloy at different temperatures during CO oxidation.
- Subjects
BIMETALLIC catalysts; ALLOYS; OXIDATION; CATALYST structure; LOW temperatures; TEMPERATURE
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49968-6