experimental and kinetic study of co oxidation over lafe1-xcuxo3 (x=0, 0.2, 0.4, 0.6) perovskite-type oxides

In this paper, catalytic oxidation of co over lafe1-xcuxo3 (x= 0, 0.2, 0.4, 0.6) perovskite-type oxides was investigated. the catalysts were synthesized by sol-gel method and characterized by xrd, bet, ft-ir, h2-tpr, and sem methods. the catalytic activity of catalysts was tested in catalytic oxidation of co. xrd patterns confirmed the synthesized perovskites to be single-phase perovskite-type oxides. the synthesized perovskite catalysts show high activity in the range of reaction temperature (50 - 300 ºc). the substitution of cu in b-site of the perovskite catalysts enhanced their catalytic activity for co oxidation. among different synthesized perovskite catalysts, lafe0.6cu0.4o3 has the highest activity: nearly complete elimination of co was achieved at 275 ºc with this catalyst. kinetic studies for co oxidation were performed based on power law and mars-van krevelen mechanisms. according to kinetic calculations, the most probable mechanism is the mkv-d (dissociative adsorption of oxygen) which can predict the experimental data with correlation coefficient of r2 > 0.995.