摘要
A series of mixed oxides La_(2-x)Sr_xCoO_4±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 K_2NiF_4 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 CH_4 was investigated and the relationships between the activity,composition and structure of the mixed oxides have been elucidated.
A series of mixed oxides La<sub>2-x</sub>Sr<sub>x</sub>CoO<sub>4</sub>±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 K<sub>2</sub>NiF<sub>4</sub> 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 CH<sub>4</sub> was investigated and the relationships between the activity,composition and structure of themixed oxides have been elucidated.
基金
the National Natural Science Foundation of China
