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<p>Effective removal of soot deposited in diesel particulate filter by catalysts has attracted great attention in the aftertreatment field to achieve environment protection, but the problem is short by incomplete and poor soot combustion. Herein, an integrated ZnO–SnO<sub>2</sub> semiconductor n–n heterostructure strategy of catalysts and ash is proposed for promoting diesel soot combustion. The integrated effects of different catalysts and ZnO ash on soot oxidation are studied with thermogravimetric analysis and gas emission analysis. The diesel soot is simulated by Printex U (PU) particles, and the catalysts include SnO<sub>2</sub>, ZrO<sub>2</sub>, TiO<sub>2</sub>, CeO<sub>2</sub> and Pt/Al<sub>2</sub>O<sub>3</sub> nanoparticles. Compared with other catalysts, the best catalytic effect on soot oxidation is achieved when SnO<sub>2</sub> catalyst is mixed with PU/ZnO at 1:1:1 mass ratio in tight contact method. The <i>S</i> and <i>R</i><sub>w</sub> indexes reach the largest values of 9.33 × 10<sup>–8</sup>%<sup>2</sup>&#xa0;min<sup>−2</sup>℃<sup>−3</sup> and 38.64 × 10<sup>5</sup>, and the CO<sub>2</sub> amount reaches the maximum value at 3462&#xa0;ppm, which is correspondingly with the XRD and XPS spectrum results of PU/ZnO/SnO<sub>2</sub> with ZnO–SnO<sub>2</sub> heterojunction structure having more adsorbed oxygen. The excessive catalyst is negative to the heat and oxygen transfer among the nanoparticles. When the mass ratio of PU/ZnO/SnO<sub>2</sub> is 1:1:1, the soot combustion presents the comparatively superior state. The results of this study innovate the soot oxidation influenced by catalyst and ash, which benefits the optimization of passive regeneration strategy in DPF application.</p>

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An integrated ZnO–SnO2 n–n heterostructure strategy of catalysts and ash for promoting diesel soot combustion

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Jia Fang,
  • Xilong Xu,
  • Yi Yang,
  • Zhiqiang Han,
  • Zinong Zuo,
  • Weiqiang Han,
  • Bin Lin

摘要

Effective removal of soot deposited in diesel particulate filter by catalysts has attracted great attention in the aftertreatment field to achieve environment protection, but the problem is short by incomplete and poor soot combustion. Herein, an integrated ZnO–SnO2 semiconductor n–n heterostructure strategy of catalysts and ash is proposed for promoting diesel soot combustion. The integrated effects of different catalysts and ZnO ash on soot oxidation are studied with thermogravimetric analysis and gas emission analysis. The diesel soot is simulated by Printex U (PU) particles, and the catalysts include SnO2, ZrO2, TiO2, CeO2 and Pt/Al2O3 nanoparticles. Compared with other catalysts, the best catalytic effect on soot oxidation is achieved when SnO2 catalyst is mixed with PU/ZnO at 1:1:1 mass ratio in tight contact method. The S and Rw indexes reach the largest values of 9.33 × 10–8%2 min−2℃−3 and 38.64 × 105, and the CO2 amount reaches the maximum value at 3462 ppm, which is correspondingly with the XRD and XPS spectrum results of PU/ZnO/SnO2 with ZnO–SnO2 heterojunction structure having more adsorbed oxygen. The excessive catalyst is negative to the heat and oxygen transfer among the nanoparticles. When the mass ratio of PU/ZnO/SnO2 is 1:1:1, the soot combustion presents the comparatively superior state. The results of this study innovate the soot oxidation influenced by catalyst and ash, which benefits the optimization of passive regeneration strategy in DPF application.