Applied Catalysis2022，Vol.30612.DOI:10.1016/j.apcatb.2022.121117

Co-promotion of two-type active sites: PtCux single-atom alloy and copper-ceria interface for preferential oxidation of CO

Wang Q. Gong J. Zhang H. Xue L. Wu J. Li J. Wang Y. Liu Z. Gao R. Zeng S. Fan Q.-Y.
Applied Catalysis2022，Vol.30612.DOI:10.1016/j.apcatb.2022.121117
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  • NSTL
  • Elsevier

Co-promotion of two-type active sites: PtCux single-atom alloy and copper-ceria interface for preferential oxidation of CO

Wang Q. 1Gong J. 1Zhang H. 1Xue L. 1Wu J. 1Li J. 1Wang Y. 1Liu Z. 1Gao R. 1Zeng S. 1Fan Q.-Y.2
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作者信息

  • 1. Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical Engineering Inner Mongolia University
  • 2. State Key Laboratory of Physical Chemistry of Solid Surface College of Chemistry and Chemical Engineering Xiamen University
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Abstract

? 2022Isolated single atoms of a platinum-group dispersed in surface layer of a metal host to synthesize single-atom alloys (SAAs) has proven to be favorable for improving catalytic activity and while retaining high selectivity of host metal. Here we report a co-promotion strategy of PtCux single-atom alloy and copper-ceria interface for preferential oxidation of CO. The Pt0.1Cu0.19/CeO2 catalyst exhibits superior catalytic performance and excellent stability, attributable to the regulation of the electronic interaction between Pt and Cu as well as the high proportion of oxygen vacancies. Moreover, operando DRIFTS experiments prove that the partial of Cu0 on the surface of CeO2 is oxidized to Cu+ during catalysis. The adsorbed CO readily reacts with oxygen over the Pt0.1Cu0.19/CeO2 to produce CO2 due to the presence of two-type active sites. Density functional theory simulations in conjunction with isotopic experiments unequivocally reveal that the Mars-van Krevelen mechanism is prominent on the as-synthesized PtCu SAAs.

Key words

Density functional theory/Operando spectroscopy/Oxygen vacancy/Preferential CO oxidation/Single-atom alloy

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出版年

2022
Applied Catalysis

Applied Catalysis

ISSN：0926-3373
被引量16
参考文献量76
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