Synthesis,characterization and catalytic behaviour of La_2-xSr_xCo0₄±λ（x=0—2）in complete oxidation

【摘要】 <正> A series of mixed oxides La_2-xSr_xCoO₄±λ（x=0—2）with varying x values was synthesized.The crystal structure of this series of mixed oxides was studied by using XRD.The result showed that whenx=0.25—1.5 the mixed oxides possessing K₂NiF₄ structure are formed.The valences of the transition metalCo and the relation between ±λ content and x value by using chemical analysis method have been measured,too.The redox property of this series of mixed oxides and different kinds of oxygen species werestudied by IR,TPD,TPR,XPS and SEM methods.The catalytic activity in the complete oxidationof CO and CH₄ was investigated and the relationships between the activity,composition and structure of themixed oxides have been elucidated.更多还原

【Abstract】 A series of mixed oxides La_2-xSr_xCoO₄±λ（x=0—2）with varying x values was synthesized. The crystal structure of this series of mixed oxides was studied by using XRD.The result showed that when x=0.25—1.5 the mixed oxides possessing K₂NiF₄ structure are formed.The valences of the transition metal Co and the relation between ±λ content and x value by using chemical analysis method have been measured, too.The redox property of this series of mixed oxides and different kinds of oxygen species were studied by IR,TPD,TPR,XPS and SEM methods.The catalytic activity in the complete oxidation of CO and CH₄ was investigated and the relationships between the activity,composition and structure of the mixed oxides have been elucidated.更多还原