Ni系钙钛矿氧化物导电性及其CO氧化活性  

TX STUDIES ON ELECTRICAL CONDUCTIVITY AND CO OXIDATION ACTIVITY OF NiBASED PEROVSKITELIKE OXIDE CATALYSTS

作　　者：马智[1] 秦永宁[1] 王士文[1] 梁珍成[1] 齐晓周[1] 

机构地区：[1]天津大学化工系

出　　处：《无机化学学报》1997年第4期416-419,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金

摘　　要：本文考查了Ｎｉ系钙钛矿类希土复合氧化物在不同气氛条件下电导率随温度的变化情况，结合活性评价结果，初步探索了结构、活性及导电率之间的关系。研究结果表明：在测定温度范围内，ＬａＮｉＯ３具有金属导电性，而Ｌａ２ＮｉＯ４和ＬａＳｒＮｉＯ４为ｐ型半导体；电导率与ＣＯ氧化活性之间存在相互对应的关系，其大小顺序均为ＬａＮｉＯ３＞ＬａＳｒＮｉＯ４＞Ｌａ２ＮｉＯ４。?In the paper, the electrical conductivity variation with temperature in different atmospheres and the CO oxidation activity of Nibased perovskitelike oxide catalysts were stuided. The results showed that, in the temperature range of CO oxidation, LaNiO 3 presents metal conductivity, while La 2NiO 4 and LaSrNiO 4 are characterized by the semiconductivity. In CO oxidation, CO adsorption on LaNiO 3 is the key step whereas O 2 adsorption on La 2NiO 4 and laSrNiO 4 is the key step. The electrical conductivity order is LaNiO 3>LaSrNiO 4>La 2NiO 4, which correspondes to that of their CO oxidation activities.

关 键 词：钙钛矿型 稀土 复合氧化物 催化剂 一氧化碳氧化 

分 类 号：O643.36[理学—物理化学]