STRUCTURE OF La_(2-x)Sr_xCoO_(4±λ) AND THEIR CATALYTIC PROPERTIES IN OXIDIZATION OF CO AND C_3H_8
The perovskite-like La 2-x Sr xCoO 4±λ (x=0—1.0)mixed oxides were prepared by the polyglycol gel method, investigated by using the XRD, IR, BET, TPD and chemical analysis methods, and used successfully for CO and C 3H 8 oxidization.In addition, the effects of coefficient x on their structure and catalytic activities of these samples were studied.The results indicate that all La 2-x Sr xCoO 4-λ have K 2NiF 4 structure, their structure and catalytic activities change regularly with the change of coefficient x.The catalytic activity of LaSrCoO 4-λ is the best among all samples, which can be explained in terms of more mobile lattice oxygen, higher content of Co 3+ , more oxygen vacancies and more chemisorbed oxygen of LaSrCoO 4-λ .