汽车尾气净化三效催化剂的合成与性能  

Synthesis and performances of three-way auto-exhaust catalyst

作　　者：高玲[1] 尚福亮[2] 杨海涛[1] 黄学辉[2] 

机构地区：[1]深圳大学材料学院深圳特种功能材料重点实验室,广东深圳518060 [2]武汉理工大学材料复合新技术国家重点实验室

出　　处：《无机盐工业》2007年第2期30-32,共3页Inorganic Chemicals Industry

基　　金：教育部科学技术研究重点项目(项目编号:02049);国家基金重大国际合作子项目(项目编号:50220160567)

摘　　要：为开发新的尾气净化催化剂,运用改进的柠檬酸络合自燃法合成出单一晶相的B位双掺杂类钙钛矿化合物La4B aCu4Co0.5N i0.5O13+δ,根据DTA-TG测试确定了材料的最佳热处理温度为800℃,并通过XRD和SEM等对材料的物相结构和显微形貌进行了基本的分析,结果显示800℃时所制备的材料为单一类钙钛矿结构,其晶相为正交晶系,颗粒分布均匀;对材料的汽车尾气净化三效催化活性进行了测试,结果表明所制备的材料具有良好的尾气净化三效催化性能,当空燃比(空气与燃料的比值,下同)为14.6时,其对一氧化碳、碳氢化合物和氮的氧化物的催化转化效率分别达到了97%,82%和88%。In order to develop a new kind of auto exhaust catalyst, the single - phase perovskite - like compound La4BaCu4Co0.5 Ni0.5 O13＋8 was synthesized with two kinds of dements dopping in the ＂B＂ position by the improved citric acid complexation self - ignition method. The optimal heat treatment temperature was 800 ℃ confirmed by the DTA - TG test. The microstructure and crystalline phase were tested by the SEM and XRD respectively. The results revealed that the material belonged to orthorhombic system and the granules distributed evenly. The three - way catalyst＇s activity test results showed the material was a good kind of three - way catalyst for the automobile exhaust. When the air/fuel ratio was 14.6, the catalytic conversion efficiency for CO,HC and NO. were 97% ,82% and 88% ,respectively.

关 键 词：类钙钛矿 溶胶-凝胶 三效催化剂 

分 类 号：TQ032.4[化学工程]