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

A series of LaxK1–xCoO3 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 °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 °C, the CO conversion could reach 100%.