Preparation and Water-Gas Shift Catalytic Activities of the Perovskite Type Complex Oxide La_(1-x) C

• 作 者: 马红钦 谭欣 朱慧铭 张继炎 张鎏
• 机 构: School of Chemical Engineering and Technology, Tianjin University,School of Chemical Engineering and
• 出 处: Transactions of Tianjin University
• 发表日期: 2003年02期
• 关键词: preserved partially

The perovskite type rare earth iron complex (REIC) oxide La 1-x Ce xFeO 3 is designed and prepared as water gas shift catalyst. Activity evaluation and heat resisting test show that the perovskite type compounds La 1-x Ce xFeO 3(·K) has a good thermal stability if x is less than or equal to 0.5 . But when x is greater than 0.5 , La 1-x Ce xFeO 3(·K) will turn out to be ceria and magnetite partially or completely at high temperature in the shift reaction atmosphere. In the case of x=0.5, the conversion of carbon monoxide is about 68% at 530 ℃. Potassium can greatly improve the low temperature activity, but slightly lower the high temperature activity, and has little impact on the thermal stability. La 0.5 Ce 0.5 FeO 3 (·K) is a promising chromium free high temperature shift catalyst. 

The perovskite type rare earth iron complex (REIC) oxide La 1-x Ce x FeO 3 is designed and prepared as water gas shift catalyst. Activity evaluation and heat resisting test show that the perovskite type compounds La 1-x Ce x FeO 3 (· K But when x is greater than 0.5, La 1-x Ce x FeO 3 (· K) will turn out to be ceria and magnetite partially or completely at high temperature in the shift reaction atmosphere. In the case of x = 0.5, the conversion of carbon monoxide is about 68% at 530 ° C. Potassium can greatly improve the low temperature activity, but slightly lower the high temperature activity, and has little impact on the thermal La 0.5 Ce 0.5 FeO 3 (· K) is a promising chromium free high temperature shift catalyst