A series of (AO)(ABO3)n(A=La, B=Ni, n-1～4) type mixed oxides were synthesized and characterized by means of XRD, XPS, IR, TPD, TPR. Their structure characteristics and redox properties were studied. The nonstoichiometry (λ) of oxygen and the valence of transition metal Ni were determined by using chemical analysis method. The catalytic activities of this series of mixed oxides for complete oxidation of CO and CH4 were examined and the relationships among activity, composition and structure were discussed.

Key words: INFRARED SPECTROPHOTOMETRY, CRYSTAL STRUCTURE, X-RAY DIFFRACTION ANALYSIS, NICKEL OXIDE, X-RAY PHOTOELECTRON SPECTROMETRY, TEMPERATURE PROGRAMMING DESORPTION, LANTHANUM OXIDE, DOUBLE OXIDE, CATALYTIC BEHAVIOUR