Memory-dictated dynamics of single-atom Pt on CeO2 for CO oxidation

Zihao Zhang, Jinshu Tian, Yubing Lu, Shize Yang, Dong Jiang, Weixin Huang, Yixiao Li, Jiyun Hong, Adam S. Hoffman, Simon R. Bare, Mark H. Engelhard, Abhaya K. Datye and Yong Wang ()
Additional contact information
Zihao Zhang: Pacific Northwest National Laboratory
Jinshu Tian: Pacific Northwest National Laboratory
Yubing Lu: Pacific Northwest National Laboratory
Shize Yang: Arizona State University
Dong Jiang: Washington State University
Weixin Huang: Washington State University
Yixiao Li: Washington State University
Jiyun Hong: SLAC National Accelerator Laboratory
Adam S. Hoffman: SLAC National Accelerator Laboratory
Simon R. Bare: SLAC National Accelerator Laboratory
Mark H. Engelhard: Pacific Northwest National Laboratory
Abhaya K. Datye: University of New Mexico
Yong Wang: Pacific Northwest National Laboratory

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Single atoms of platinum group metals on CeO2 represent a potential approach to lower precious metal requirements for automobile exhaust treatment catalysts. Here we show the dynamic evolution of two types of single-atom Pt (Pt1) on CeO2, i.e., adsorbed Pt1 in Pt/CeO2 and square planar Pt1 in PtATCeO2, fabricated at 500 °C and by atom-trapping method at 800 °C, respectively. Adsorbed Pt1 in Pt/CeO2 is mobile with the in situ formation of few-atom Pt clusters during CO oxidation, contributing to high reactivity with near-zero reaction order in CO. In contrast, square planar Pt1 in PtATCeO2 is strongly anchored to the support during CO oxidation leading to relatively low reactivity with a positive reaction order in CO. Reduction of both Pt/CeO2 and PtATCeO2 in CO transforms Pt1 to Pt nanoparticles. However, both catalysts retain the memory of their initial Pt1 state after reoxidative treatments, which illustrates the importance of the initial single-atom structure in practical applications.

Date: 2023
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DOI: 10.1038/s41467-023-37776-3

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