LaSrMO_4复合氧化物的结构及其己烷完全氧化性能

Structure of LaSrMO_4 and their Catalytic Properties in the Total Oxidation of Hexane

采用分解无定形柠檬酸和乙二胺四乙酸聚合体法,合成了具有类钙钛矿型结构的LaSrMO4(M=Mn,Fe,Co,N i,Cu)催化材料,以己烷完全氧化为探针反应,运用XRD、BET、TPR、TPD、FT-IR、XPS等手段进行表征.结果表明:对己烷完全氧化性能的顺序为LaSrCoO4>LaSrN iO4>LaSrCuO4>LaSrFeO4>LaSrMnO4,且氧空穴和可移动晶格氧越多、比表面积越大及颗粒度越小,均有利于提高己烷完全氧化活性.

The perovskite-type LaSrMO4 （M = Mn, Fe, Co, Ni, Cu） mixed oxides were prepared by amorphous citric and ethylene diamine tetraaeetie acid complexes decomposition and investigated using XRD, FT-IR, BET, TPR, TPD and XPS methods. The catalytic behavior was examined in the total oxidation of hexane. The order of catalytic activity for the total oxidation of hexane was LaSrCoO4 〉 LaSrNiO4 〉 LaSrCuO4 〉 LaSrFeO4 〉 LaSrMnO4. This is explained in terms of its more oxygen vacancies and mobile lattice oxygen, smaller particle size and larger BET surface areas.