A single site ruthenium catalyst for robust soot oxidation without platinum or palladium.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37932256.
- Also identified by DOI 10.1038/s41467-023-42935-7 and PMC identifier 10628289.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 CeO<sub>2</sub> through a gas bubbling-assisted membrane deposition method. The formed single-atom Ru sites, which occupy surface lattice sites of CeO<sub>2</sub>, can improve activation efficiency for NO and O<sub>2</sub>. Remarkably, the Ru<sub>1</sub>/CeO<sub>2</sub> 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<sup>-1</sup>) 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.