Synthesis of LaxK1-xCoO3 nanorod and their catalytic performances for CO oxidation

A series of LaxK(1-x)CoO(3) nanorod oxides with perovskite structure were synthesized by sol-gel method using polyvinyl alcohol (PVA) as additive. These perovskite-type complex oxide catalysts were characterized by the techniques of X-ray diffraction (XRD), infrared (IR), Brumauer-Emmett-Teller (BET) and scanning electron microscopy (SEM). And the results showed that nanorods of La1-xKxCoO3 perovskite-type complex oxides were fabricated by sol-gel method when the mass concentration of PVA was 4% and the calcined temperature kept at 700 degrees C for 4 h. The catalytic results of CO oxidation showed that the LaxK1-xCoO3 catalysts had high activity. LaCoO3 nanorods exposed more {110} plane than LaCoO3 nanoparticles, which was beneficial to the catalytic oxidation of CO. LaCoO3 nanorods had the best catalytic performance for the oxidation of CO. At 200 degrees C, the CO conversion could reach 100%.