ABO_3型稀土铝酸盐的表面状态及其催化性能

THE SURFACE PROPERTIES OF LaAlO_3 PEROVSKITE OXIDES AND THEIR CATALYTIC ACTIVITIES

大量文献资料表明,甲烷催化氧化偶联反应中,催化剂的表面状态起着关键作用.本文初步探讨了LnAlO3对甲烷偶联反应的催化性能,并用X光衍射（XRD）技术表征了催化剂的体相性质,用X光电子能谱（XPS）和程序升温脱附（TPD）技术研究了表面状态、组成和表面碱性,并同催化性能进行了关联.1

A series of rare earth aluminate oxides were prepared by nitrate decomposition.The catalysts obtained were characterized by XRD,CO_2 TPD and XPS techniques andtheir catalytic activities for methane coupling were measured, The experimentalresults showed that the basicity of the surface can be interpreted by the double ioni-zation energy of oxygen species on the surface. There exists some correlation betweenthis parameter and their catalytic activities.