Synthesis of La_xK_(1–x)CoO_3 nanorod and their catalytic performances for CO oxidation  

作　　者：刘坚 王季秋 赵震 徐春明 韦岳长 段爱军 姜桂元 

机构地区：[1]State Key Laboratory of Heavy Oil,College of Science,China University of Petroleum

出　　处：《Journal of Rare Earths》2014年第2期170-175,共6页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China(21376261,21173270,21177160);the National High-Tech Research and Development Program of China(863 Program)(2013AA065302);Beijing Natural Science Foundation(2142027);Doctor Select Foundation of China University(20130007110007,NCET-10-0811)

摘　　要：A series of LaxKl xCoO3 nanorod oxides with perovskite structure were synthesized by sol-gel method using polyvinyl al- cohol （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 nano- rods 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 ℃ for 4 h. The catalytic results of CO oxidation showed that the LaxK1-xoO3 catalysts had high activity. LaCoO3 nanorods exposed more {110} plane than LaCoO3 nanoparticles, which was beneficial to the catalytic oxi- dation of CO. LaCoO3 nanorods had the best catalytic performance for the oxidation of CO. At 200 ℃, the CO conversion could reach 100%.A series of LaxKl xCoO3 nanorod oxides with perovskite structure were synthesized by sol-gel method using polyvinyl al- cohol （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 nano- rods 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 ℃ for 4 h. The catalytic results of CO oxidation showed that the LaxK1-xoO3 catalysts had high activity. LaCoO3 nanorods exposed more {110} plane than LaCoO3 nanoparticles, which was beneficial to the catalytic oxi- dation of CO. LaCoO3 nanorods had the best catalytic performance for the oxidation of CO. At 200 ℃, the CO conversion could reach 100%.

关 键 词：PEROVSKITE nanorod CATALYST catalytic oxidation CO rare earths 

分 类 号：O643.3[理学—物理化学]