钙钛矿型La_(0.8)Ce_(0.2)Fe_(1-x)Co_xO_3催化剂的制备及其三效催化活性  

Preparation of La_(0.8)Ce_(0.2)Fe_(1-x)Co_xO_3 perovskitee-type catalysts and their three-way catalytic activity

作　　者：陈佳阳[1] 张文强[1] 陈耀文 郭锡坤[2] 宋一兵[2] CHEN Jiayang;ZHANG Wenqiang;CHEN Yaowen;GUO Xikun;SONG Yibing(Central Laboratory,Shantou University,Shantou Guangdong 515063,China;College of Science,Shantou University,Shantou Guangdong 515063,China)

机构地区：[1]汕头大学中心实验室,广东汕头515063 [2]汕头大学理学院,广东汕头515063

出　　处：《化工环保》2018年第4期431-436,共6页Environmental Protection of Chemical Industry

基　　金：广东省社会发展攻关计划项目(2013B030600001)

摘　　要：采用自燃烧法制备了一组钙钛矿型复合氧化物La_(0.8)Ce_(0.2)Fe_(1-x)Co_xO_3(x=0.9,0.7,0.5,0.3,0.1),并考察了其对CO、C_3H_6和NO的三效催化活性。XRD和SEM表征结果显示,La_(0.8)Ce_(0.2)Fe_(1-x)Co_xO_3具有良好的钙钛矿型晶体结构,晶粒大小为纳米级并自组装成片状结构。催化剂的比表面积为14.73~22.43 m^2/g,含有微孔和介孔结构。催化活性评价结果表明:La_(0.8)Ce_(0.2)Fe_(0.1)Co_(0.9)O_3具有很好的三效催化活性,在理论空燃比的条件下,CO、C_3H_6和NO的起燃温度分别为195℃、264℃和290℃,完全转化温度分别为239℃、418℃和415℃,低温三效催化活性良好;Fe和Co的掺杂量同时影响着La_(0.8)Ce_(0.2)Fe_(1-x)Co_xO_3的催化效果。The La0.8Ce0.2Fe1-xCoxO3（x=0.9,0.7,0.5,0.3,0.1）perovskite-type composite oxides were prepared by self-combustion process,and their three-way catalytic activities for CO,C3H6 and NO was studied. The characterization results by XRD and SEM indicated that the La0.8Ce0.2Fe1-xCoxO3 catalysts had good perovskite-type crystal structure,and the grains were nano-scale and had laminated structure by self-assembly. The specific surface areas of the catalysts were 14.73-22.43 m2/g,and microporous and mesoporous structures existed in the catalysts. The evaluation results for catalytic activity showed that：La0.8Ce0.2Fe0.1Co0.9O3 had excellent three-way catalytic activity;Under the condition of theoretical air-fuel ratio,the light-off temperatures and the dynamic temperatures of CO,C3H6,NO were 195,264,290 ℃ and 239,418,415 ℃,respectively,which exhibiting good low-temperature three-way catalytic performance of the catalysts;The three-way catalytic activity of La0.8Ce0.2Fe1-xCoxO3 were affected both by the doped amount of Fe and Co.

关 键 词：三效催化剂 自燃烧法 镧 铈 铁 钴 

分 类 号：X511[环境科学与工程—环境工程]