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Ultra-stable low-coordinated PtSA/CeZrO2 ordered macroporous structure integrated industrial-scale monolithic
Baojian Zhang1,2,3, Rui Liu1,2,3, Liangwei Li1,2,3
1Institute of Environmental and Applied Chemistry, College of Chemistry, Central China Normal University, Wuhan, PR China.
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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 PtSA/CeZrO2 catalyst, featuring isolated Pt single atoms (PtSA) on a Ce0.8Zr0.2O2 support with an ordered macroporous (OM) structure. Firstly, Zr-stabilized dynamic low-coordinated PtSA 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 gPt/L, compared with 0.9 gPt/L in commercial diesel oxidation catalysts. As a result, the PtSA/CeZrO2 maintains 92% conversion at 450 °C even after 50 h aging at 800 °C with 10 vol.% H2O. Finally, the catalyst is integrated into a 3.4-liter commercial cordierite monolith for developing and scaling robust catalytic converters.
