介孔CuO-CeO_2复合催化剂的制备及催化性能研究

Preparation and catalytic performance of mesoporous CuO-CeO_2 composite catalyst

以硝酸铜和硝酸铈为前驱体,阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和非离子表面活性剂聚环氧乙烷-聚环氧丙烷-聚环氧乙烷(P123)为双模板,通过改进的模板法成功制备了高比表面积、粒径均匀、分散度良好的介孔CuO-CeO_2复合催化剂,并通过扫描电镜、透射电镜和X射线衍射等手段进行表征,并考察了甲苯的催化降解性能。结果表明:反应温度70℃、CTAB∶P123=15∶1、Cu∶Ce=1∶5下制备的介孔CuO-CeO_2复合催化剂具有优异的纳米特性,CuO活性物种在CeO_2基体上高度分散且催化剂有效比表面积最大,对甲苯的催化降解性能较高。

Copper nitrate and cerium nitrate were used as precursors and cationic surfactant hexadecyl trimethyl am- monium bromide （CTAB） and non-ionic surfactants polyethylene oxide polypropylene oxide-polyethylene oxide （P123） were used as dual-templates. Mesoporous CuO-CeO2 composite catalysts with high specific surface area, uniform particle size and good dispersion were successfully synthesized by modified template method. The catalysts were characterized by SEM,TEM,XRD and other testing methods and the catalytic performance was studied visa degradation of toluene. The re- suits showed that the catalyst had excellent nanoproperties of copper oxide active species height in the cerium oxide sub- strate dispersion and the catalyst had the maximum effective surface area and higher catalytic degradation of toluene synthe- sized at the condition that reaction temperature was 70双流 ,CTAB：P123 was 15： 1 ,Cu ：Ce was 1：5.