【摘要】 用XRD、IR和TPR等技术研究了钙钛矿型复合氧化物的晶体结构及其反应性能.整个组成范围内,LaNi_i-xMn_xO₃（0.0≤x≤1.0）体系都生成单一钙钛矿相;x=0.0,0.6≤X≤1.0时为菱形晶系,0.2≤x≤0.5为立方晶系.IR和TPR研究表明,晶体结构对B—O键合作用存在较大影响.CO微反考察表明,本体系的催化活性与晶系存在密切关系,晶体对称性越高,反应活性越低.说明钙钛矿型复合氧化物的催化活性与体系活性中心的B—O键合作用能力有关.更多还原

【Abstract】 The crystal structure and catalytic behavior of perovskite-type oxides LaNi1_xMnxO3 (0.0≤x≤1.0) have been investigated by XRD、TPR and IR techniques. The phase analysis by XRD showed LaNi1-xMnxO3 system produced completely the single perovskite structure. The oxides within the range of x=0.0, 0.6≤x≤1.0 were Rhombohedral and Cubic symmetry with 0.2≤x≤0.5, IR spectra showed the crystal symmetry had well effect on the B-O bonding strength. The catalytic activity of oxides were well related to the crystal symmetry. The higher the crystal symmetry is, the lower the reactive activity is. This showed the catalytic activity of perovskite-type oxides well associated with the B-O bonding strength of the oxides active renter.更多还原