制备方法对Co_3O_4-CeO_2催化剂催化性能的影响研究

Effect of Preparation Methods on the Performance of the Co_3O_4 - CeO_2 Catalyst

用水热法、共沉淀法、柠檬酸络合物法和多元醇法分别合成了铈钴摩尔比1∶1的Co3O4-CeO2催化剂,并用XRD、TPR、TPD、FT-IR、BET等对催化剂的晶相结构、还原性能、吸附性能及比表面积等进行了表征.结果表明,制备方法对Co3O4-CeO2催化剂的催化性能具有较大的影响,其中多元醇法制备的催化剂能促进Co3O4和CeO2的相互作用,该催化剂还原温度较低、CO脱附面积较大,在140℃温度下,CO的转化率达到90%以上.

Co3O4-CeO2 catalysts were prepared by hydrothermal method,precipitation method,citric acid complex method and polyatomic alcohol method.The crystal structure,reduction properties,adsorption properties and specific surface were investigated by XRD,TPR,TPD,FT-IR,BET.The results show that the preparation methods make great effects on the catalytic properties of the Co3O4-CeO2.The catalyst which was prepared by the polyatomic alcohol method can promote the interaction of the Co3O4 and CeO2.The catalyst has lower reduction temperature,larger CO desorption area.The conversion of CO can reach to 90% at 140 ℃ temperature.