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Selective and stable Au-Cu bimetallic catalyst for CO-PROX

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Abstract

Gold-based catalysts are promising in CO preferential oxidation (CO-PROX) reaction in H2-rich stream on account of their high intrinsic activity for CO elimination even at ambient temperature. However, the decrease of CO conversion at elevated temperature due to the competition of H2 oxidation, together with the low stability of gold nanoparticles, has posed a dear challenge. Herein, we report that Au-Cu bimetallic catalyst prepared by galvanic replacement method shows a wide temperature window for CO total conversion (30–100 °C) and very good catalyst stability without deactivation in a 200-h test. Detailed characterizations combined with density functional theory (DFT) calculation reveal that the synergistic effect of Au-Cu, the electron transfer from Au to Cu, leads to not only strengthened chemisorption of CO but also weakened dissociation of H2, both of which are helpful in inhibiting the competition of H2 oxidation thus widening the temperature window for CO total conversion.

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Acknowledgements

This work was financially supported by the “Transformational Technologies for Clean Energy and Demonstration”, the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS, No. XDA21030900), DNL Cooperation Fund, CAS (No. DNL201903), and the National Natural Science Foundation of China (No. 51701201).

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  1. Feng Hong and Guanjian Cheng contributed equally to this work.

Authors and Affiliations

  1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Feng Hong, Weihao Hu, Shengyang Wang, Qike Jiang, Junhong Fu & Jiahui Huang

  2. College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Soochow University, Suzhou, 215006, China

    Guanjian Cheng

  3. CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Botao Qiao

  4. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Shengyang Wang

  5. School of Chemistry and Chemical Engineering, Yulin University, Yulin, 719000, China

    Weihao Hu

  6. University of Chinese Academy of Sciences, Beijing, 100049, China

    Feng Hong

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  1. Feng Hong
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Hong, F., Cheng, G., Hu, W. et al. Selective and stable Au-Cu bimetallic catalyst for CO-PROX. Nano Res. 16, 9031–9038 (2023). https://doi.org/10.1007/s12274-023-5672-4

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