Proparation of LaSrCoO_4 Mixed Oxides and Their Catalytic Properties

The perovskite-like LaSrCoO4 mixed oxides with K2NiF4 structure were prepared by the gelatin, polyglycol gel and polyacrylamide gel methods and used successfully for CO and C3H8 oxidation. These samples were investigated by using the XRD, TEM, BET, TPR and TPD methods. The effects of preparation methods on structure and performance of LaSrCoO4 were studied. The results indicate that all La2_xSrxCoO4have tetragonal K2NiF4 structure, their structure and catalytic activities change with the change of the preparation methods. T* phase appears in LaSrCoO4 prepared by the polyacrylamide gel method, and the lower the calcination temperature is, the more the T* phase appears. At the order of LaSrCoO4 prepared by gelatin method, polyglycol gel method and polyacrylamide gel method, their BET surface areas, oxygen vacancies, mobile lattice oxygen and catalytic activities gradually increase, in addition, the lower calcination temperature is advantageous to these changes.