合成出一系列La_(1-s)A′_sFeO_3(A′=Ca、Sr、Ba;0≤2≤1)复合氧化物催化剂,并研究了Ca、Sr、Ba部分取代La后催化剂对CO氧化活性的影响。以XRD测定其晶体结构。结果表明,除含Ca>0.5和Ba=1.0外均生成钙钛矿型结构。用XPS和TPD法研究了吸附性能。指认吸附氧是CO氧化的活性物种,并初步解释了活性规律的成因。 A series of La_ (1-s) A’_sFeO_3 (A’= Ca, Sr, Ba; 0≤2≤1) composite oxide catalysts were synthesized and the effects of the catalysts on the CO oxidation Effect of activity. The crystal structure was determined by XRD. The results show that, in addition to Ca> 0.5 and Ba = 1.0 are generated outside the perovskite structure. Adsorption properties were studied by XPS and TPD methods. It is indicated that the adsorbed oxygen is the active species oxidized by CO, and the origin of the activity law is initially explained.