Unraveling distinct effects between CuOx and PtCu alloy sites in Pt−Cu bimetallic catalysts for CO oxidation at different temperatures

Yunan Li, Lingling Guo, Meng Du, Chen Tian, Gui Zhao, Zhengwu Liu, Zhenye Liang, Kunming Hou, Junxiang Chen, Xi Liu, Luozhen Jiang (), Bing Nan () and Lina Li ()
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Yunan Li: Chinese Academy of Sciences
Lingling Guo: Chinese Academy of Sciences
Meng Du: Chinese Academy of Sciences
Chen Tian: Chinese Academy of Sciences
Gui Zhao: Shanghai Jiao Tong University
Zhengwu Liu: Chinese Academy of Sciences
Zhenye Liang: Chinese Academy of Sciences
Kunming Hou: Chinese Academy of Sciences
Junxiang Chen: TILON Group Technology Limited
Xi Liu: Shanghai Jiao Tong University
Luozhen Jiang: Chinese Academy of Sciences
Bing Nan: Chinese Academy of Sciences
Lina Li: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-49968-6

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