Ultra-stable low-coordinated Pt<sub>SA</sub>/CeZrO<sub>2</sub> ordered macroporous structure integrated industrial-scale monolithic catalysts for high-temperature oxidation.
basic_science · Level V
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- Record sourced from PubMed, PMID 40846834.
- Also identified by DOI 10.1038/s41467-025-63112-y and PMC identifier 12373748.
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Abstract
Platinum-group metals (Pt) commonly used in thermal catalytic processes often suffer from catalyst deactivation, such as Pt sintering, Pt overoxidation, and Pt loss under high-temperature conditions. To address these, we present a novel Pt<sub>SA</sub>/CeZrO<sub>2</sub> catalyst, featuring isolated Pt single atoms (Pt<sub>SA</sub>) on a Ce<sub>0.8</sub>Zr<sub>0.2</sub>O<sub>2</sub> support with an ordered macroporous (OM) structure. Firstly, Zr-stabilized dynamic low-coordinated Pt<sub>SA</sub> releases more free d-electrons by reducing Pt-O bond occupation, thereby preserving peroxide activity at high temperatures and enhancing propane C-H activation. Additionally, the OM structure prevents Pt loss and reduces Pt loading to 0.4 g<sub>Pt</sub>/L, compared with 0.9 g<sub>Pt</sub>/L in commercial diesel oxidation catalysts. As a result, the Pt<sub>SA</sub>/CeZrO<sub>2</sub> maintains 92% conversion at 450 °C even after 50 h aging at 800 °C with 10 vol.% H<sub>2</sub>O. Finally, the catalyst is integrated into a 3.4-liter commercial cordierite monolith for developing and scaling robust catalytic converters.