Research on catalytic performance of supported perovskite catalyst for NO oxidation and resistance to SO₂ poisoning

Supported perovskite-type catalysts La_1-xCe_xCoO₃/CeO₂ (x = 0~0.3) were synthesized through complexing impregnation with citric acid and characterized by X-ray diffraction (XRD), Fourier transformed infrared (FT-IR), nitrogen adsorption, H₂ temperature-programmed reduction (H₂-TPR), and O₂ temperature-programmed desorption (O₂-TPD). The performance of NO catalytic oxidation and SO₂ resistance were investigated in the article. The results showed that the catalytic activity of La_1-xCe_xCoO₃/CeO₂ was closely related to the surface area and redox properties. Especially La_0.8Ce_0.2CoO₃/CeO₂ achieved 78% NO conversion at 300 ℃.The introduction of CeO₂ as support simultaneously enhanced the low temperature activity and SO₂ resistance.