制备方法对镧钡共改性氧化铝性能的影响  

Effect of Preparation Methods on Property of La, Ba Co-modified Alumina

作　　者：董文萍[1] 张丽娟[1] 温怡芸[1] 陈耀强[1] 龚茂初[1] 

机构地区：[1]四川大学化学学院,成都610064

出　　处：《无机化学学报》2008年第6期998-1002,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家重点基础研究发展规划项目(No.2005CB221404)资助

摘　　要：The effect of preparation method on the properties of alumina modified by La2O3 and BaO was investigated by means of Low temperature nitrogen adsorption-desorption, NH3-TPD, NO-TPD and XRD. The results show that alumina prepared by peptizing method exhibits the best textural properties, alumina obtained by co-precipitation method presents the strongest surface acidity and alumina derived from impregnation method shows the best ability of NO adsorption. After calcination at 1 100 ℃, all alumina except that from impregnation method have excellent thermal stability. When the specific surface area and pore volume of alumina are large enough, the activity of catalyst Pd/alumina is affected primarily by the surface acidity of alumina.The effect of preparation method on the properties of alumina modified by La2O3 and BaO was investigated by means of Low temperature nitrogen adsorption-desorption, NH3-TPD, NO-TPD and XRD. The results show that alumina prepared by peptizing method exhibits the best textural properties, alumina obtained by co-precipitation method presents the strongest surface acidity and alumina derived from impregnation method shows the best ability of NO adsorption. After calcination at 1 100 ℃, all alumina except that from impregnation method have excellent thermal stability. When the specific surface area and pore volume of alumina are large enough, the activity of catalyst Pd/alumina is affected primarily by the surface acidity of alumina.

关 键 词：氧化铝 氧化钡 氧化镧 制备方法 

分 类 号：O614.331[理学—无机化学] O614.233[理学—化学]