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Chen Aiping (Institute of Technical Chemistry Physics, East China University of Science and Technology, Shanghai 200237) Ma Jianxin (Institute of Catalysis, East China University of Science and Technology, Shanghai 200237) Fang Ming, Lau Ngai Ting  
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.
【CateGory Index】: O643.3
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