Cu^(2+)掺杂对Ce-Zr-O固溶体结构及苯催化燃烧性能的影响  

Effects of Cu^(2+) Doping on Structure and Catalytic Activity for Benzene Combustion of Ce-Zr-O Solid Solution

作　　者：蔡超 薛屏[1] 

机构地区：[1]宁夏大学能源化工重点实验室

出　　处：《宁夏大学学报（自然科学版）》2005年第4期345-348,共4页Journal of Ningxia University(Natural Science Edition)

基　　金：宁夏大学科研基金资助项目(QN0433)

摘　　要：用柠檬酸溶胶-凝胶法制备了掺杂Cu2+的Ce-Zr-O固溶体,利用X-射线粉末衍射法(XRD)对其晶相进行了分析．结果表明,由Ce-Zr-O固溶体掺杂Cu2+形成的Ce-Zr-Cu-O具有与CeO2相似的立方晶型,经1000℃高温处理后,晶体结构未发生变化．与未掺杂Cu2+的Ce-Zr-O固溶体相比,Ce-Zr-Cu-O对苯完全氧化反应有较高的催化活性,在苯氧化为CO2且CO2的生成率(Yco2)相同时,其所需要的反应温度明显低于Ce-Zr-O固溶体所需的反应温度,Yco2为10％,50％和90％时,反应温度差△t分别为67,47,38℃．当反应温度达到550℃时,Ce-Zr-Cu-O能够催化苯蒸气全部转化为CO2,显示出良好的低温燃烧催化性能．当反应温度为450℃时,经800℃和1 000℃高温热处理的Ce-Zr-Cu-O的催化活性分别为78％和41％,表明其具有较好的耐热稳定性．Cu-doped Ce-Zr-O solid solution was prepared via a citric acid sol-gel technique and tested for benzene oxidation. Nano-size solid solution particles of Ce-Zr-Cu-O were attained under the conditions of this study. The sample has the cubic structure similar to CeO2 by the XRD analysis and the cubic structure can maintain after being treated at 1 000℃ for 3 h. Ce-Zr-Cu-O exhibits higher catalytic activity for the complete oxidation of benzene, compared with no Cu-doped Ce Zr-O solid solution. The reaction temperature is lower obviously than that of Ce-Zr-O solid solution when benzene was oxidated and obtained the same productivity of CO2. Benzene can be completely oxidized in the presence of Ce-Zr-Cu-O when the reaction temperature exceed 550 ℃. Ce-Zr-Cu-O catalyst calcined at either 800℃ or 1 00 0 ℃ for 3 h still had fairly good thermal stability and catalytic activity.

关 键 词：CE-ZR CU-O Ce-Zr-O 固溶体 催化燃烧 苯 

分 类 号：O643.3[理学—物理化学]