钙钛矿结构在CO还原SO2催化脱硫中的作用

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ＬａＯ２Ｓ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。

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

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.