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Citation: Qi Fan, Shuai Zhang, Liying Sun, Xue Dong, Lancui Zhang, Wenjuan Shan, Zaiming Zhu. Catalytic oxidation of diesel soot particulates over Ag/LaCoO3 perovskite oxides in air and NOx[J]. Chinese Journal of Catalysis, ;2016, 37(3): 428-435. doi: 10.1016/S1872-2067(15)61000-2 shu

Catalytic oxidation of diesel soot particulates over Ag/LaCoO3 perovskite oxides in air and NOx

  • 1.

    Institute of Chemistry for Functionalized Materials, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, 116029, Liaoning, China

  • Corresponding author: Wenjuan Shan,  Zaiming Zhu, 
  • Received Date: 10 October 2015
    Available Online: 29 October 2015

  • Ag/LaCoO3 perovskite catalysts for soot combustion were prepared by the impregnation method. The structure and physicochemical properties of the catalysts were characterized using X-ray diffraction, N2 adsorption-desorption, H2 temperature-programmed reduction, soot temperature-programmed reduction, and X-ray photoelectron spectroscopy. The catalytic activity of the catalysts for soot oxidation was tested by temperature-programmed oxidation in air and in a NOx atmosphere. Metallic Ag particles were the main Ag species. Part of the Ag migrated from the surface to the lattice of the LaCoO3 perovskite, to form La1-xAgxCoO3. This increased the amount of oxygen vacancies in the perovskite structure during thermal treatment. Compared with unmodified LaCoO3, the maximum soot oxidation rate temperature (Tp) decreased by 50-70 ℃ in air when LaCoO3 was partially modified by Ag, depending on the thermal treatment temperature. The Tp of the Ag/LaCoO3 catalyst calcined at 400 ℃ in a NOx atmosphere decreased to about 140 ℃, compared with that of LaCoO3. Ag particles and oxygen vacancies in the catalysts contributed to their high catalytic activity for soot oxidation. The stable catalytic activity of the Ag/LaCoO3 catalyst calcined at 700 ℃ in a NOx atmosphere was related to its stable structure.
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