层状复合氧化物La_4BaCu_(5-x)M_xO_(13+λ)的制备、表征及对CO还原NO的活性  

Preparation and Characterization of Layered Mixed Oxide La_4BaCu_(5-x)M_xO_(13+λ) and Its Catalytic Activity for NO+CO

作　　者：刘钰[1] 杨向光[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：《催化学报》2000年第1期59-63,共5页

基　　金：国家自然科学基金!资助项目(29133081) .

摘　　要：采用柠檬酸爆炸法合成了系列层状钙钛矿型复合氧化物Ｌａ４ＢａＣｕ５ － ｘＭｘＯ１３＋ λ（Ｍ＝ Ｍｎ，Ｃｏ； ｘ＝ ０ ～５） 催化剂． 用ＴＰＤ，ＴＰＲ 和化学分析法对催化剂进行了表征，考察了催化剂在ＣＯ还原ＮＯ 中的催化活性．结果表明，掺杂Ｍｎ，Ｃｏ 后催化剂中的活性氧含量及氧化还原性质发生了变化． 掺杂少量Ｍｎ，Ｃｏ 可使催化剂在ＣＯ 还原ＮＯ中的催化活性明显提高，且掺杂Ｃｏ 的样品比掺杂Ｍｎ 的样品活性提高更明显．这是由于ＣｕＭｎ 与ＣｕＣｏ 之间的协同作用不同导致的结果．Two series of layered mixed oxide with perovskite structure were prepared by citrate method. The catalyst was characterized by O 2 TPD, H 2 TPR and chemical analysis, and its catalytic activity for the reduction of NO by CO was investigated. The results showed that the active oxygen content and redox property of the catalyst change when Mn or Co is doped in La 4BaCu 5O 13- λ and the catalytic activity for NO+CO increases when proper concentration of Mn or Co is doped. These results can be attributed to the synergic effect between Cu and Mn or Cu and Co. The synergic effect between Cu and Mn is stronger than that between Cu and Co. But La 4BaCu 5- x Co x O 13+ λ showed higher activity than La 4BaCu 5- x Mn x O 13+ λ . It can be attributed to Co ions having higher activity for N 2O formation.

关 键 词：钙钛矿结构 氮氧化物 大氧污染 金属催化剂 

分 类 号：O643.36[理学—物理化学]