【摘要】 采用共沉淀法制备CexMn1-xCazO2-λ载体,然后用等体积浸渍法负载活性组分Cu,制得Cuy/CexMn1-xCazO2-λ催化剂.实验结果表明:Ce:Mn:Ca摩尔比为0.6:0.4:0.08,Cu负载量为5%时,制得的Cu5%/Ce0.6Mn0.4Ca0.08O2-λ催化剂对CO、C3H6和NO的转化反应具有良好的催化活性,能使CO、C3H6和NO的起燃温度T50分别为107℃、218℃和212℃,完全转化温度T90分别为144℃、323℃和298℃;由于Mn和Ca能与Ce氧化物形成稳定的立方晶固溶体,不出现Mn2O3或CuO晶相在载体表面富集的现象,Mn和Ca与Ce的良好协同作用有效提高催化活性,所以Cu5%/Ce0.6Mn0.4Ca0.08O2-λ催化性能良好.更多还原

【Abstract】 The CexMn1-xCazO2-λ supporter was prepared by coprecipitation method,and then the Cuy /CexMn1-xCazO2-λ catalyst was made by volumetric immersion method to load active component Cu on the supporter.The experimental result indicated that when Ce : Mn : Ca molar ratio was 0.6 : 0.4 : 0.08 and the content of Cu was 5%(weigh),the Cu5% / Ce0.6Mn0.4Ca0.08O2-λ catalyst showed high catalytic performance. The light-off temperatures of CO、C3H6 and NO were 107 ℃、218 ℃ and 212 ℃ respectively,and CO、C3H6 and NO could be completely converted when the temperature were 144 ℃,323 ℃ and 298 ℃ respectively. Because Mn and Ca could form stable cubic structure of the solid solution with Ce oxide,and did not appear the Mn2O3 or CuO crystalline phase enrichment on the surface of the supporter,the good synergistic effect of Ce-Mn-Ca could improve the catalytic activity effectively,so the Cu5% /Ce0.6Mn0.4Ca0.08O2-λ catalyst exhibited high catalytic performance.更多还原