纳米La0.8A’0.2Mn1-xCuxO3（A’=Ce and/or Sr）的制备、表征及其高效催化NO+CO的性能研究

采用柠檬酸-溶胶凝胶法制得钙钛矿型复合氧化物La0.8Ce0.2Mn1-xCuxO3(x=0.2,0.3,0.4),La0.8Sr0.2Mn0.6Cu0.4O3,La0.8Ce0.1Sr0.1Mn0.6 Cu0.4 O3,并采用X射线衍射(XRD)、扫描电镜(SEM)、比表面积(BET)、X射线光电子能谱(XPS)对其进行表征,测试了复合氧化物对CO+NO的催化活性。结果表明:La0.8Ce0.1Sr0.1Mn0.6Cu0.4O3催化活性最好,150℃时CO转化率91.8%,300℃时NO转化率100%;对于La0.8Ce0.2Mn1-xCuxO3(x=0.2,0.3,0.4),比表面积和颗粒的大小及分散度是影响催化活性的主要因素;对于La0.8Ce0.2Mn0.6Cu0.4O3,La0.8 Sr0.2 Mn0.6 Cu0.4 O3,La0.8 Ce0.1 Sr0.1 Mn0.6 Cu0.4 O3,催化剂的组成是影响催化活性的关键因素。

Preparation and Characterization of Nano-La0.8A'0.2Mn1-xCuxO3 (A' =Ce and/or Sr) and Their Catalytic Activity for Removal of NO+CO

Perovskite-type oxides La0.8Ce0.2Mn1-xCuxO3(x=0.2,0.3,0.4),La0.8Sr0.2Mn0.6Cu0.4O3,and La0.8Ce0.1Sr0.1Mn0.6Cu0.4O3 were prepared by citrate sol-gel method,and characterized by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),specific surface area(BET) and the X-ray photoelectron spectroscopy(XPS).Their catalytic activities for removal of NO+CO were also investigated.The results indicated that La0.8Ce0.1Sr0.2Mn0.6Cu0.4O3 showed the highest catalytic activity,i.e.the conversion of CO and NO had reached 91.8% at 150 ℃ and 100% at 300 ℃ respectively.The specific surface area,grain size and spread of solid particles were the major factors affected the catalytic activity for La0.8Ce0.2Mn1-xCuxO3(x=0.2,0.3,0.4),while the composition was the key factor affected the catalytic activity for La0.8Ce0.2Mn0.6Cu0.4O3,La0.8Sr0.2Mn0.6Cu0.4O3 and La0.8Ce0.1Sr0.1Mn0.6Cu0.4O3.