Simultaneously activating molecular oxygen and surface lattice oxygen on Pt/TiO<sub>2</sub> for low-temperature CO oxidation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39122681.
- Also identified by DOI 10.1038/s41467-024-50790-3 and PMC identifier 11316131.
- Licence recorded as CC BY-NC-ND.
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Abstract
Developing high-performance Pt-based catalysts with low Pt loading is crucial but challenging for CO oxidation at temperatures below 100 °C. Herein, we report a Pt-based catalyst with only a 0.15 wt% Pt loading, which consists of Pt-Ti intermetallic single-atom alloy (ISAA) and Pt nanoparticles (NP) co-supported on a defective TiO<sub>2</sub> support, achieving a record high turnover frequency of 11.59 s<sup>-1</sup> at 80 °C and complete conversion of CO at 120 °C. This is because the coexistence of Pt-Ti ISAA and Pt NP significantly alleviates the competitive adsorption of CO and O<sub>2</sub>, enhancing the activation of O<sub>2</sub>. Furthermore, Pt single atom sites are stabilized by Pt-Ti ISAA, resulting in distortion of the TiO<sub>2</sub> lattice within Pt-Ti ISAA. This distortion activates the neighboring surface lattice oxygen, allowing for the simultaneous occurrence of the Mars-van Krevelen and Langmuir-Hinshelwood reaction paths at low temperatures.