期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 306, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121117
关键词
Single-atom alloy; Oxygen vacancy; Operando spectroscopy; Density functional theory; Preferential CO oxidation
资金
- National Natural Science Foundation of China [21968020, 21962013, 22068026]
- Natural Science Foundation of Inner Mongolia [2018MS02020, 2018BS02008]
- Grassland Talent Innovation Team of Inner Mongolia
This study reports a co-promotion strategy of PtCu 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, attributed to the regulation of the electronic interaction between Pt and Cu as well as the high proportion of oxygen vacancies.
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 Cu-0 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.
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