层状复合氧化物La_2BaCu_(5-x)Mn_xO_(12)的表征及在催化消除NO中活性的研究  

Synthesis, Characterization and Catalytic Behavior of Layered Mixed Oxides La_4BaCu_(5-x)Mn_xO_12 in NO Reduction by CO

作　　者：刘钰[1] 杨向光[1] 赵震[1] 吴越[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《化学学报》1998年第8期785-791,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(29133081)

摘　　要：采用柠檬酸配合法合成了结构呈层状ABO_3的La_4BaCu_5O_(12)复合氧化物,并以它为基体合成了一系列Mn取代Cu的样品(La_4BaCu_(5-x)Mn_xO_(12),x=1～5。)并利用XRD,IR进行了结构表征,结果表明其均为5层的ABO_3结构.利用H_2-TPR考查了掺杂Mn以后样品的氧化还原性能的变化,发现由于Mn的掺杂使Cu明显的容易还原还考查了样品对NO+CO反应的催化活性,结果表明反应的活性中心是Cu离子,但加入适量的Mn离子可以使活性提高.A series of sample having the stoichiometry La4BaCu5-xMnxO12(x = 0-5) were prepared,characterized by XRD,IR and H2 - TPR and used as catalyst for NO + CO reaction. It was found that they have 5-layered ABO3-type structure. The results of H2 - TPR showed that the Cu ion was more easily reduced while a part of them was replaced by Mn ions. Their catalytic behavior to NO + CO reaction was investigate, La4BaCu2Mn3O12 showed the highest catalyst activity for the reaction than the others. The reaction mechanism is discussed: the activity of the catalysts could be attributed to the Cu ions,but it was improved when Mn ions took the place of some Cu ions.

关 键 词：层状复合氧化物 氮氧化物 消除 催化剂 一氧化氮 

分 类 号：X511.05[环境科学与工程—环境工程]