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

doi:10.1016/S1872-2067(15)61000-2

Abstract

Abstract:

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, N₂adsorption-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 NO_x 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 La_1-xAg_xCoO₃. This increased the amount of oxygen vacancies in the perovskite structure during thermal treatment. Compared with unmodified LaCoO₃, the maximum soot oxidation rate temperature (T_p) decreased by 50-70 ℃ in air when LaCoO₃ was partially modified by Ag, depending on the thermal treatment temperature. The T_p of the Ag/LaCoO₃ catalyst calcined at 400 ℃ in a NO_x 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 NO_x atmosphere was related to its stable structure.

Key words: Soot combustion, NO_x, Silver, Perovskite, Thermal stability

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 NO_x[J]. Chinese Journal of Catalysis, 2016, 37(3): 428-435.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61000-2

https://www.cjcatal.com/EN/Y2016/V37/I3/428

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

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