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Research Article

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

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.

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Graphical Abstract

Au-Cu bimetallic catalyst prepared by galvanic replacement method can dramatically widen the temperature window for CO total conversion (30–100 °C) and has good catalyst stability without deactivation in a 200-h test.

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

gold catalysisCO preferential oxidation (CO-PROX)electronic interactiongalvanic replacement

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 9031-9038
DOI: 10.1007/s12274-023-5672-4
Cite this article:
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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Received: 14 January 2023
Revised: 06 March 2023
Accepted: 15 March 2023
Published: 31 May 2023
© Tsinghua University Press 2023
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