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Nano Research 2023, 16(7): 9031-9038 https://doi.org/10.1007/s12274-023-5672-4
Research Article | Issue | Published: 31 May 2023

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

Show Author's Information Feng Hong1,6,§,  Guanjian Cheng2,§,  Weihao Hu1,5,  Shengyang Wang1,4,  Qike Jiang1,  Junhong Fu1,  Botao Qiao3( ),  Jiahui Huang1( )
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Soochow University, Suzhou 215006, China
CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China
University of Chinese Academy of Sciences, Beijing 100049, China

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

Keywords:
galvanic replacement, gold catalysis, electronic interaction, CO preferential oxidation (CO-PROX)
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Catalysts
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Hong F, Cheng G, Hu W, et al. Selective and stable Au-Cu bimetallic catalyst for CO-PROX. Nano Research, 2023, 16(7): 9031-9038. https://doi.org/10.1007/s12274-023-5672-4
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Abstract Full text Electronic supplementary material About this article

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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About this article

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

Show Author's information Feng Hong1,6,§, Guanjian Cheng2,§, Weihao Hu1,5, Shengyang Wang1,4, Qike Jiang1, Junhong Fu1, Botao Qiao3( ), Jiahui Huang1( )
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Soochow University, Suzhou 215006, China
CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China
University of Chinese Academy of Sciences, Beijing 100049, China

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

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.

Keywords: galvanic replacement, gold catalysis, electronic interaction, CO preferential oxidation (CO-PROX)

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Publication history
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Acknowledgements

Publication history

Received: 14 January 2023
Revised: 06 March 2023
Accepted: 15 March 2023
Published: 31 May 2023
Issue date: July 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

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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