摘要
合成了具有钙钛石和类钙钛石结构的复合氧化物ＬａＮｉＯ_３、Ｌａ_（０．１）Ｓｒ_（０．９）ＮｉＯ_３、Ｌａ_２ＮｉＯ_４和ＬａＳｒＮｉＯ_４．考察了它们对ＮＯ的吸附和ＮＯ直接分解反应的催化性能；结合比表面测定、化学分析、ＸＲＤ和ＮＯ－ＴＰＤ对催化剂的表征结果，探讨了该系列复合氧化物对ＮＯ的吸附规律。
The mixed oxides LaNiO_3, La_(0.1)Sr_(0.9)NiO_3, La_2NiO_4 and LaSrNiO_4 with perovskite(ABO_3)and related(A_2BO_4)structures were prepared and the adsorption property for NO and the catalytic activity for NO decomposition over these oxidse were also tested. The catalysts were characterized by means of BET surface measurement,chemical analysis, NO-TPD etc..It was shown that the adsorption amount of NO is correlated with the concentration of oxygen vacancy formed and the adsorption type and strength of NO are related to the valence of metallic ion. Generally there are three kinds of adsorption species, NO￣-,NO￣+and NO on the mixed oxides, among them the negative adsorpion species(NO￣-)are active for NO decomposition. The weaker the adsorption of oxygen on the catalyst is, the faster the mobility of oxygen is and the easier the redox process takes place in reproducing the active sites in which the oxygen species(O￣-,O￣(2-))would participate.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第5期790-793,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
钙钛石
镍
一氧化氮
吸附性能
Perovskite and related structure mixed oxides , Adsorption of NO, Oxygen vacancy, Valence of metal ion
