负载型CeO_2-ZrO_2固溶体的性能及其在甲烷燃烧Pd催化剂中的应用(英文)  

Properties of CeO_2-ZrO_2 Solid Solution Supported on Si-Modified Alumina and Its Application in Pd Catalyst for Methane Combustion

作　　者：王晓红[1,2] 卢冠忠[1] 郭耘[1] 乔东升[1] 张志刚[1] 郭杨龙[1] 李春忠[2] 

机构地区：[1]华东理工大学工业催化研究所结构可控先进功能材料及其制备教育部重点实验室,上海200237 [2]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

出　　处：《催化学报》2008年第10期1043-1050,共8页

基　　金：the National Basic Research Programof China(2004CB719500);the National Natural Science Foundation of China(20601008);the Commission of Science and Technology of Shanghai Municipality(06JC14095)

摘　　要：以硅改性的氧化铝为载体,用反相微乳液法合成了负载型的CeO2-ZrO2固溶体(Ce-Zr-O/Si-Al2O3),用低温氮吸附、X射线衍射、程序升温还原、拉曼光谱和X射线光电子能谱等方法对Ce-Zr-O/Si-Al2O3的织构性能、热稳定性和储放氧性能等进行了表征.结果表明,负载后的CeO2-ZrO2晶相与负载前相比没有变化,但热稳定性和在低温下的放氧能力及总储氧量明显提高.作为甲烷燃烧Pd催化剂的载体,Ce-Zr-O/Si-Al2O3的性能明显优于CeO2-ZrO2,Si-Al2O3和机械混合物CeO2-ZrO2+Si-Al2O3.使用0.2%Pd/10%Ce-Zr-O/Si-Al2O3为催化剂时,甲烷90%转化率时的温度仅为345℃,比负载在其它载体上的Pd催化剂低175℃.CeO2-ZrO2 solid solution was supported on Si-modified alumina （Ce-Zr-O/Si-Al2O3） by the reverse mieroemulsion method. Its structure, thermal stability, and oxygen release capacity were studied by N2 adsorption, XRD, TPR, Raman spectroscopy, and XPS. The crystalline phase of Ce-Zr-O on Si-Al2O3 was the same as that of unsupported CeO2-ZrO2（Ce-Zr-O）, but its thermal stability, oxygen release capacity at low temperature, and total oxygen storage capacity were higher. As the support of a Pd catalyst for methane combustion, Ce-Zr-O/Si-Al2O3 had better properties than Ce-Zr-O, Si-Al2O3, and the mixture of Ce-Zr-O ＋ Si-Al2O3. Using the 0.2 % Pd/10 % Ce-Zr-O/Si-Al2O3 catalyst, Tgo for methane combustion was only 345 ℃ , which was 175℃ lower than that of Pd supported on other supports.

关 键 词：负载型氧化铈-二氧化锆固溶体 硅改性氧化铝 钯催化剂 催化活性 甲烷燃烧 

分 类 号：O643.36[理学—物理化学]