掺杂Mn对Ce-Zr复合氧化物性能的影响  

Effects of Doping Manganese on the Properties of Ce-Zr Compound Oxides

作　　者：刘萍[1] 房华[1] 赵明[1] 张丽娟[1] 张晓玉[1] 龚茂初[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,成都610064

出　　处：《无机材料学报》2006年第6期1417-1422,共6页Journal of Inorganic Materials

基　　金：国家重点基金(20333032);国家自然科学基金(20273043)

摘　　要：采用共沉淀方法制备了一系列Ce-Zr-Mn复合氧化物储氧材料,并应用X射线衍射(XRD),BET,氧吸附,以及程序升温还原(TPR)对这些样品进行表征,研究了样品老化前后的结构和织构变化,储氧性能,还原性能以及物相的变化．结果表明,在Ce-Zr固溶体中掺入少量的Mn可以显著提高储氧材料的储氧能力,降低还原温度,而且均形成稳定的立方晶相的CeO_2-ZrO_2固溶体．当Mn含量(摩尔分数)达到0．025时,样品的储氧量达到最高,同时在织构上表现出优越的抗老化性能,经1273K高温老化5h后比表面积可高达57．8m^2/g．A series of Ce-Zr-Mn compound oxides oxygen storage materials were synthesized by a co-precipitation method and characterized by X-ray diffraction （XRD）, BET, oxygen adsorption and temperature programmed reduction （TPR）. The modification of the textural and structural properties, oxygen storage capacity, redox behavior, and phase changes were investigated. The results show that incorporating a small amount of manganese into Ce-Zr solid solution can remarkably improve the oxygen storage capacity and decrease the temperature of the reduction of the oxygen storage materials. Moreover, only a stable cubic phase CeO2-ZrO2 solid solution is formed. The Ce-Zr-Mn Compound oxide indicates the highest oxygen storage capacity （OSC） and excellent property of resistance to aging when manganese content （mole fraction） is 0.025, its surface area can reach 57.8m^2/g after aging 5h at 1273K.

关 键 词：铈锆锰复合氧化物 储氧性能 还原性 抗老化 

分 类 号：TB33[一般工业技术—材料科学与工程] O643[理学—物理化学]