La_(n+1)Ni_nO_(3n+1)(n=1～4)复合氧化物的制备、表征和催化性能的研究

Studies on Synthesis, Characterization and Catalytic Properties of La_(n+1)Ni_nO_(3n+1) Mixed Oxides

合成了(AO)(ABO_3)_n(A=La,B=Ni,n=l～4)型系列复合氧化物.用XRD,XPS,IR,TPD,TPR等方法对其进行了表征,研究了结构特征,氧化一还原性能.用化学分析方法测定了镍的价态及氧缺陷.考察了该系列复合氧化物对CO,CH_4的完全氧化活性,并对其活性与化学组成及结构间的关系进行了讨论.

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.