摘要
本文采用共沉淀法制备了Cu-Ce-La复合氧化物催化剂,采用XRD、BET、TPR对所合成样品进行表证,并考察了其对变换反应的催化活性。以4.0mol/L的NaOH为沉淀剂所制备的Cu-Ce-La复合氧化物催化剂具有良好的活性和热稳定性。La3+和Ce4+以铜离子的部分取代形成了稳定的共熔体和强的协同效应是其活性和热稳定性提高的主要原因。NaOH沉淀剂的浓度是决定所合成催化剂介孔结构大小的主要因素,随着NaOH沉淀剂浓度由0.5提高到2.0mol/L,CuO与CeO2之间的协同效应大幅度提高。
Cu-Ce-La mixed oxide catalysts were prepared by co-precipitation methods with a series of precipitator concentration and characterized using X-ray diffraction,BET,temperature-programmed reduction and catalytic reaction for the water-gas shift reaction.The Cu-Ce-La mixed oxide prepared by 4.0 mol/L NaOH concentration presented the highest activity and thermal stability.the precipitator concentration influence the activity of catalyst via the stability of crystal structure and mesoporous structure.La3＋ or Ce4＋ substituted copper ion of CeO2 framework during reaction process.The concentration of precipitator can control pore diameter of catalyst in synthetical process.The raising of precipitator concentration,from 0.5 to 2.0 mol/L,lead to enhancing of synergistic effects between CuO and CeO2.
出处
《内蒙古工业大学学报（自然科学版）》
2011年第3期204-211,共8页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
supported by NSFC(21066008)
the Major Program of Natural Science Foundation of Inner Mongolia(2009ZD01)
key scientific and technological project of Inner Mongolia(20101501)
the Talented Person Foundation of Inner Mongolia and the Program Foundation for Coal Chemistry Preponderant Discipline of IMUT
