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ACS Appl Mater Interfaces. 2018 Nov 7;10(44):38134-38140. doi: 10.1021/acsami.8b15585. Epub 2018 Oct 24.

In Situ Formation of Isolated Bimetallic PtCe Sites of Single-Dispersed Pt on CeO2 for Low-Temperature CO Oxidation.

Li J1,2, Tang Y3,4, Ma Y2, Zhang Z2, Tao FF3,4, Qu Y2.

Author information

1
Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering , Liaocheng University , Liaocheng 252059 , China.
2
Center for Applied Chemical Research, Frontier Institute of Science and Technology and Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology , Xi'an Jiaotong University , Xi'an 710049 , China.
3
State Key Laboratory of Photocatalysis on Energy and Environment and College of Chemistry , Fuzhou University , Fuzhou 350116 , China.
4
Department of Chemical and Petroleum Engineering , University of Kansas , Lawrence , Kansas 66047 , United States.

Abstract

Identification of the chemical states of catalytic sites is critical for an atomic-level understanding of catalytic mechanisms. Herein, hydrogen thermal pretreatment of the Pt single atoms on porous nanorods of CeO2 (Pt1/ PN-CeO2) induced the formation of isolated bimetallic PtCe sites as a new type of active center for CO oxidation. The evolutions of Pt1/ PN-CeO2 catalysts during the hydrogen pretreatment and CO oxidation were examined by various in situ techniques including infrared, ambient-pressure X-ray photoelectron and X-ray absorption spectroscopy. The experimental results demonstrate that these bimetallic sites can be partially preserved or reoxidized into Pt-O-Ce with a low coordination number with oxygen under realistic conditions, leading to the appropriate CO adsorption and activating the efficient activity of Pt1/ PN-CeO2 for CO oxidation at low temperature.

KEYWORDS:

CO oxidation; Pt single atoms; bimetallic PtCe sites; in situ formation; porous nanorods of CeO2

PMID:
30360084
DOI:
10.1021/acsami.8b15585

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