【摘要】 采用柠檬酸络合燃烧法制备La_0.90A_0.10CoO₃（A=Mg, Ca, Sr, Ba）催化剂，用XRD、FT-IR、SEM、BET、H₂-TPR和NO-TPD等手段对La_0.90A_0.10CoO₃催化剂的理化性质进行表征，在固定床反应器中评价了催化剂CO-SCR脱硝活性。结果表明：采用柠檬酸络合燃烧法制备的La_0.90A_0.10CoO₃催化剂具有钙钛矿结构，无杂相生成(La_0.90Mg_0.10-CoO₃除外);与LaCoO₃催化剂相比，Ba²⁺部分取代La³⁺后，生成的La_0.90Ba_0.10CoO₃催化剂粒径小且比表面积大，有良好的分散性和氧化还原性，对NO有适宜的吸脱附性能，CO-SCR脱硝性能好，在反应温度为360℃时，NO转化率为68.7%,其他碱土金属部分取代La³⁺后，催化活性变差。更多还原

【Abstract】 La_0.90A_0.10CoO₃（A=Mg, Ca, Sr, Ba） catalyst was prepared by citric acid complexation combustion method. The physicochemical properties of La_0.90A_0.10CoO₃ catalyst were characterized by XRD, FT-IR, SEM,BET, H₂-TPR and NO-TPD. CO-SCR denitrification activity of the catalyst was evaluated in a fixed-bed reactor. The results show that La_0.90A_0.10CoO₃ catalyst prepared by citric acid complexation combustion has a perovskite structure and no heterogeneous generation(except La_0.90Mg_0.10CoO₃). Compared with LaCoO₃ catalyst, La_0.90Ba_0.10CoO₃ catalyst which is partially La³⁺ substituted by Ba²⁺, has small particle size and the large specific surface area, good dispersibility and redox performance, suitable absorption and desorption performance for NO, and good catalytic CO-SCR denitrification performance. At reaction temperature 360 ℃, NO conversion rate can reach 68.7%. The catalytic activity become poor after other alkaline earth metals partially replacing La³⁺.更多还原