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用Mossbauer,IR等技术及对样品磁化率与电导率的测量,研究了钙钛石型复合氧化物La_(1-x)Sr_xFeO_(3-λ)体系中,活性金属铁离子在改变x时的价态和配位环境的变化及其对催化活性的影响。发现催化剂在0≤x<0.5～0.7范围内,其Fe—O键的相互作用较强,催化活性主要由催化剂的表面化学所控制;在0.7≤x≤1.0范围内,催化剂中Fe-O键相互作用减弱,氧空位出现有序化,在这一范围内,催化活性主要由催化剂的体相化学控制。
The Mossbauer, IR and other measurements were used to measure the magnetic susceptibility and conductivity of the samples. The effects of La (1-x) Sr_xFeO_ (3-λ) Variations of Valence State and Coordination Environment and Their Effects on Catalytic Activity. The results show that the catalyst has strong Fe-O bond interaction in the range of 0≤x <0.5 ~ 0.7. The catalytic activity is mainly controlled by the surface chemistry of the catalyst. Within the range of 0.7≤x≤1.0, the Fe-O bond Interaction weakened, oxygen vacancies appear orderly, in this context, the catalytic activity of the catalyst mainly controlled by the bulk chemical.