Citation: WEI Wei, WU Ai-Chun, QIAO Zhi-Wei, LI Shu-Hua, LIANG Hong, PENG Feng. Effect of Sr and Fe Doped LaCoO₃ on Catalytic Oxidation of Soot and Sulfur Resistance[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(1): 87-96. doi: 10.11862/CJIC.2020.031 shu

Effect of Sr and Fe Doped LaCoO₃ on Catalytic Oxidation of Soot and Sulfur Resistance

Institute for Energy & Catalysis, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China

Corresponding author: LIANG Hong, lhong@gzhu.edu.cn PENG Feng, fpeng@gzhu.edu.cn
Received Date: 23 June 2019
Revised Date: 5 December 2019

Figures(8)

A series of perovskite-type La_1-xSr_xCo_1-yFe_yO₃ catalysts were successfully prepared by the citric acid-EDTA complexation. The catalysts exhibited excellent catalytic oxidation soot activity and sulfur resistance. The characterization of X-ray diffraction (XRD), fourier transform infrared spectra (FT-IR), scanning electron microscope (SEM), H₂-temperature-programmed reduction (H₂-TPR), X-ray photoelectron spectroscopy (XPS) and SO₂-temperature programmed desorption (SO₂-TPD) were used to reveal the effect of Sr and Fe doping on the physicochemical properties and sulfur tolerance of La_1-xSr_xCo_1-yFe_yO₃ catalysts. Experimental results demonstrated that when the Sr doped with LaCoO₃, it was beneficial for the catalyst to form more surface adsorption oxygen (O₂^- or O^-) and oxygen vacancies, thereby improving both the low-temperature redox ability and catalytic oxidation soot activity of catalyst. T_i (ignition temperature of soot) and T_m (complete conversion temperature of soot) are only 284 and 347℃. Furthermore, with the doping of Fe, the low-temperature redox performance of catalyst was further improved, because the high-valent ions (Fe⁴⁺) were formed in the surface of catalyst, the Fe⁴⁺ ion could enhance the oxidation soot activity of catalyst. Moreover, the poisoning of SO₂ was mainly attributed to the sulfation (SO₃^2-, SO₄^2-) of Co²⁺/Co³⁺ and surface adsorbed oxygen, leading to deactivating the active site (O₂^- or O^- and Fe⁴⁺) of catalyst. Simultaneous doping of Sr and Fe can form a strong interaction, which can effectively inhibit the deposition of sulfur species on the catalyst surface and reduce the poisoning of SO₂ into the catalyst. Both XPS and SO₂-TPD characterizations showed that the sulfur resistance of catalyst was mainly attributed the competitive adsorption of metal ions (Fe³⁺) on SO₂, which could effectively reduce the poisoning of SO₂ on the surface adsorption oxygen and Fe⁴⁺. TPO (temperature programmed oxidation) activity characterization showed that LaSrCoFeO₃-S still maintained good catalytic oxidation soot activity. T_i and T_m were 320 and 361℃, respectively, indicating that the simultaneous doping of Sr and Fe has excellent low-temperature catalytic soot activity and good sulfur poisoning ability.
- catalytic oxidation,
- sulfur resistance,
- doping,
- mobile source,
- perovskite,
- soot
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Effect of Sr and Fe Doped LaCoO3 on Catalytic Oxidation of Soot and Sulfur Resistance

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Effect of Sr and Fe Doped LaCoO₃ on Catalytic Oxidation of Soot and Sulfur Resistance