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

Isolated 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 all...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2022-06, Vol.306, p.1, Article 121117
Main Authors: Wang, Qi, Gong, Juhui, Zhang, Heng, Fan, Qi-Yuan, Xue, Lei, Wu, Jinfang, Li, Jiaxin, Wang, Yan, Liu, Ze, Gao, Rui, Zeng, Shanghong
Format: Article
Language:English
Subjects:
Alloys
Carbon dioxide
Carbon monoxide
Catalysis
Catalysts
Catalytic activity
Cerium oxides
Copper
Density functional theory
Operando spectroscopy
Oxidation
Oxygen
Oxygen vacancy
Platinum
Preferential CO oxidation
Selectivity
Single-atom alloy
Surface layers
Synthesis
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Summary:Isolated 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. [Display omitted] •PtCux single-atom alloy together with copper-ceria interface for CO-PROX.•Synergistic catalytic effect between active sites boosts activity and selectivity.•Pt0.1Cu0.19/CeO2 exhibits superior catalytic performance and stability at 80 °C.•Mars-van Krevelen mechanism is prominent on Pt0.1Cu0.19/CeO2.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2022.121117