【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，纳米晶ＬａＣｏＯ３中镧被锶部分取代可显著提高对ＣＯ氧化的催化活性更多还原

【Abstract】 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.更多还原