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<p>Simultaneous oxidation of soot and CH<sub>4</sub> emitted from natural gas-diesel dual fuel engine is a new challenge. Herein, a robust catalyst of binary Ru-Pd components supported on three-dimensional ordered macro-mesoporous cerium-zirconium oxide (RuPd/3DOMM-CZO) is elaborately constructed. Ordered macro-mesopore structure in novel hierarchical porous cerium-zirconium oxide can respectively enhance mass transfer of soot and gaseous reactants, and binary Ru-Pd active components can improve activation for NO and CH<sub>4</sub>. RuPd/3DOMM-CZO catalyst exhibits excellent catalytic performance and stability during simultaneous soot and CH<sub>4</sub> oxidation. Based on the results of characterizations and theoretical calculations, Ru site in binary Ru-Pd components is responsible for catalyzing NO oxidation to NO<sub>2</sub>, which is key step of NO<sub>x</sub>-assisted soot oxidation mechanism, while Pd site can activate the C-H bond of CH<sub>4</sub> for boosting oxidation to CO<sub>2</sub>; the catalytic cooperation between Ru and Pd atoms can promote the rate-determining step to realize simultaneous oxidation of soot and CH<sub>4</sub>.</p>

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Catalytic cooperation between Ru and Pd atoms on hierarchical porous Ce-based oxide for boosting engine exhaust purification

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月21日

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  • Linsheng Xu,
  • Tian Qin,
  • Yuanfeng Li,
  • Hao Guo,
  • Qiao Hu,
  • Jing Xiong,
  • Yaxiao Ma,
  • Peng Zhang,
  • Xiaolin Yu,
  • Xi Liu,
  • Yunpeng Liu,
  • Zhen Zhao,
  • Jianping Zou,
  • Yuechang Wei

摘要

Simultaneous oxidation of soot and CH4 emitted from natural gas-diesel dual fuel engine is a new challenge. Herein, a robust catalyst of binary Ru-Pd components supported on three-dimensional ordered macro-mesoporous cerium-zirconium oxide (RuPd/3DOMM-CZO) is elaborately constructed. Ordered macro-mesopore structure in novel hierarchical porous cerium-zirconium oxide can respectively enhance mass transfer of soot and gaseous reactants, and binary Ru-Pd active components can improve activation for NO and CH4. RuPd/3DOMM-CZO catalyst exhibits excellent catalytic performance and stability during simultaneous soot and CH4 oxidation. Based on the results of characterizations and theoretical calculations, Ru site in binary Ru-Pd components is responsible for catalyzing NO oxidation to NO2, which is key step of NOx-assisted soot oxidation mechanism, while Pd site can activate the C-H bond of CH4 for boosting oxidation to CO2; the catalytic cooperation between Ru and Pd atoms can promote the rate-determining step to realize simultaneous oxidation of soot and CH4.