不同制备方法对铈锆复合氧化物结构及性能的影响

Study on Structure and Performance of Ce-Zr-O Mixed Oxides Prepared by Different Methods

采用共沉淀法、均相沉淀法以及反相微乳法制备了铈锆复合氧化物。通过XRD,TEM,BET等表征手段来分析所得铈锆氧化物粉体的性质,将制得的粉体涂覆在堇青石蜂窝陶瓷载体上作为涂层,担载一定量的贵金属Pt作为活性组分制得整体催化剂,并在低温水汽变换反应上考察它们的催化性能。分析结果表明:3种方法都得到了单相的铈锆固溶体;微乳法制得的纳米级铈锆固溶体粒径分布均匀、平均粒径尺寸为6 nm;所得纳米级铈锆复合氧化物的比表面积大小为微乳法>均相沉淀法>共沉淀法。实验结果表明:用微乳法制得的铈锆复合氧化物的催化性能要优于其他两种方法。

Ce-Zr-O mixed oxides were prepared by three different ways(coprecipitation,homoprecipatation and microemulsion),coated on cordierite honeycomb.Characteristics of these samples were investigated by using XRD,TEM and BET,and catalytic activity of these mixed oxides were also evaluated.The results show that all the mixed oxides were cubic single-phase,the Pt-loading Ce-Zr-O power prepared by microemulsion has higher catalytic activity in low temperature water gas shift reaction.