纳米晶LaCoO_3和La_(1-x)Sr_xCoO_3的制备及其催化氧化性能研究  

The Synthesis and Catalytic Activity of Nanocrystalline LaCoO 3 and La 1- x Sr x CoO 3

作　　者：刘源[1] 秦永宁[1] 齐晓周[1] 梁珍成[1] 

机构地区：[1]天津大学化工学院

出　　处：《天津大学学报》1999年第2期229-232,共4页Journal of Tianjin University(Science and Technology)

基　　金：天津市自然科学基金

摘　　要：研究发现以Ｎａ２ＣＯ３－ＮａＯＨ为沉淀剂，结合超临界干燥法，是合成纳米晶ＬａＣｏＯ３及Ｌａ１－ｘＳｒｘＣｏＣＯ３（其中ｘ≤０．３）的有效途径．以此法可制得平均粒径约１５ｎｍ的ＬａＣｏＯ３和平均粒径约３５ｎｍ的Ｌａ０．８Ｓｒ０．２ＣｏＯ３．ＬａＣｏＯ３对ＣＯ的催化氧化活性随粒径的减小明显提高。A technique of synthesizing nanocrystalline La 1- x Sr x CoO 3 with a perovskite structure was developed.The solution of Na 2CO 3 NaOH was taken as precipitating agent.By it and the supercritical drying method.Nanocrystalline LaCoO 3 and La 0.8 Sr 0.2 CoO 3 with a mean particle size about 15 nm and 35 nm respectively were made.It was shown that the activity of the carbon monoxide oxidation over LaCoO 3 increased significantly with the decrease of its particle size and the substitution of strontium for lanthanum in nanometer LaCoO 3 could raise the activity effectively.

关 键 词：纳米晶 LACOO3 氧化 PTO 稀土复合氧化物 催化剂 

分 类 号：O643.36[理学—物理化学]