A single site ruthenium catalyst for robust soot oxidation without platinum or palladium

Yuanfeng Li, Tian Qin, Yuechang Wei (), Jing Xiong, Peng Zhang, Kezhen Lai, Hongjie Chi, Xi Liu (), Liwei Chen, Xiaolin Yu (), Zhen Zhao (), Lina Li and Jian Liu
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Yuanfeng Li: China University of Petroleum
Tian Qin: Shanghai Jiao Tong University
Yuechang Wei: China University of Petroleum
Jing Xiong: China University of Petroleum
Peng Zhang: China University of Petroleum
Kezhen Lai: China University of Petroleum
Hongjie Chi: China University of Petroleum
Xi Liu: Shanghai Jiao Tong University
Liwei Chen: Shanghai Jiao Tong University
Xiaolin Yu: Chinese Academy of Sciences
Zhen Zhao: China University of Petroleum
Lina Li: Shanghai Advanced Research Institute
Jian Liu: China University of Petroleum

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The quest for efficient non-Pt/Pd catalysts has proved to be a formidable challenge for auto-exhaust purification. Herein, we present an approach to construct a robust catalyst by embedding single-atom Ru sites onto the surface of CeO2 through a gas bubbling-assisted membrane deposition method. The formed single-atom Ru sites, which occupy surface lattice sites of CeO2, can improve activation efficiency for NO and O2. Remarkably, the Ru1/CeO2 catalyst exhibits exceptional catalytic performance and stability during auto-exhaust carbon particle oxidation (soot), rivaling commercial Pt-based catalysts. The turnover frequency (0.218 h−1) is a nine-fold increase relative to the Ru nanoparticle catalyst. We further show that the strong interfacial charge transfer within the atomically dispersed Ru active site greatly enhances the rate-determining step of NO oxidation, resulting in a substantial reduction of the apparent activation energy during soot oxidation. The single-atom Ru catalyst represents a step toward reducing dependence on Pt/Pd-based catalysts.

Date: 2023
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DOI: 10.1038/s41467-023-42935-7

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