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<p>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 <i>d</i>-electrons by reducing Pt-O bond occupation, thereby preserving peroxide activity at high temperatures and enhancing propane C<b>–</b>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.</p>

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Ultra-stable low-coordinated PtSA/CeZrO2 ordered macroporous structure integrated industrial-scale monolithic catalysts for high-temperature oxidation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月22日

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  • Baojian Zhang,
  • Rui Liu,
  • Liangwei Li,
  • Weihong Guo,
  • Biluan Zhang,
  • Bosheng Chen,
  • Weidong Yuan,
  • Pan Li,
  • Shaowen Zhang,
  • Jinlong Wang,
  • Ji Yang,
  • Zhu Luo,
  • Yanbing Guo

摘要

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.