负载型钙钛矿催化氧化NO及抗SO_2性能研究

采用柠檬酸络合浸渍法制备了负载型钙钛矿氧化物La1-xCexCoO3/CeO2(x=0~0.3)催化剂,考察了不同Ce掺杂量对其催化氧化NO和抗硫性能的影响,并运用X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、氮气物理吸附、程序升温还原(H2-TPR)、氧气程序升温脱附(O2-TPD)等手段对催化剂进行了表征。结果表明,催化剂的活性与其比表面积大小和氧化还原性质密切相关;其中,负载型钙钛矿La0.8Ce0.2CoO3/CeO2催化剂在300℃时催化氧化NO的转化率达78%。在添加CeO2作载体后,不仅改善了非负载性钙钛矿的低温活性,而且抗硫性能也显著提高。

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.