纳米La_(0.8)A＇_(0.2)Mn_(1-x)Cu_xO_3(A＇=Ce and/or Sr)的制备、表征及其高效催化NO＋CO的性能研究  

Preparation and Characterization of Nano-La_(0.8)A'_(0.2)Mn_(1-x)Cu_xO_3(A′=Ce and/or Sr) and Their Catalytic Activity for Removal of NO+CO

作　　者：程素[1] 王丽[1] 刘磊[1] 

机构地区：[1]宁波大学材料科学与化学工程学院,宁波市新型功能材料及其制备科学实验室,浙江宁波315211

出　　处：《中国稀土学报》2012年第1期34-40,共7页Journal of the Chinese Society of Rare Earths

基　　金：浙江省自然科学基金项目(Y5080288)资助

摘　　要：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。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.

关 键 词：钙钛矿型复合氧化物 柠檬酸-溶胶凝胶法 催化活性 NO+CO 稀土 

分 类 号：O643.3[理学—物理化学] O614.33[理学—化学]