钙钛矿结构在CO还原SO_2催化脱硫中的作用  

ROLES OF PEROVSKITE PRECURSOR IN CATALYTIC DESULFURIZATION BY REDUCTION OF SO_2 WITH CO

作　　者：陈爱平[1] 马建新[2] 方明[3] 刘毅庭[3] 

机构地区：[1]华东理工大学技术化学物理研究所 [2]华东理工大学催化研究所 [3]香港科技大学研究中心

出　　处：《催化学报》1998年第4期320-324,共5页

摘　　要：通过对钴和镧的单一氧化物、混合氧化物及具有钙钛矿结构的复合氧化物（ＬａＣｏＯ３等）上ＣＯ还原ＳＯ２脱硫反应的活性以及钴镧氧化物在反应条件下活化过程的考察，指出钙钛矿结构促进了活性晶相Ｌａ２Ｏ２Ｓ和ＣｏＳ２的生成，增强了钴和镧在活化硫化及脱硫反应中的协同效应．It was investigated that the change of crystal phases and the reduction courses during the activation sulfurization of samples such as Co 3O 4, La 2O 3, mixed oxide Co 3O 4 La 2O 3(pm) as well as composite oxide LaCoO 3 with perovskite structure. During the activation sulfurization of LaCoO 3, an unknown crystal phase was determined and ascribed to LaCoO 3- x S x , partially substituted by sulfur and deformed perovskite. The roles of perovskite precursor were supposed. Firstly, the perovskite precursor could induce a so called sulfurization decomposition activation route through the intermediate species LaCoO 3- x S x , and active phases La 2O 2S and CoS 2 were formed. Secondly, it could enhance the synergism between cobalt and lanthanum during the activation desulfurization of the oxides.

关 键 词：钴酸镧 钙钛矿 脱硫 一氧化碳 二氧化硫 催化剂 

分 类 号：X511.05[环境科学与工程—环境工程] O643.36[理学—物理化学]