γ-Al_2O_3对介孔稀土复合氧化物催化特性的影响研究  

Research on the effect of γ-Al_2O_3 for the catalytic properties of mesoporous rare-earth composite oxides

作　　者：郭军武[1] 董丽华[2] 张丽[2] GUO Jun-wu DONG Li-hua ZHANG Li(Shanghai Maritime University, Marine Merchant College, Shanghai 201306, China Shanghai Maritime University, College of Ocean Science and Engineering, Shanghai 201306, China)

机构地区：[1]上海海事大学商船学院,上海201306 [2]上海海事大学海洋科学与工程学院,上海201306

出　　处：《舰船科学技术》2017年第6期77-82,87,共7页Ship Science and Technology

基　　金：国家自然科学基资助项目(11272213);上海市科技创新行动计划资助项目(15230501500)

摘　　要：利用γ-Al_2O_3替代了60%的Ce/Zr固溶基体,对介孔La/Ce/Zr复合氧化物进行改性。利用ICP分析仪、X射线衍射仪、SEM、比表面仪、激光粒度仪、热重分析仪等表征技术对制备得到的催化剂粉体进行表征。结果显示,活性Al_2O_3显著提高了催化剂粉体的比表面积,改善了高温下的表面烧结程度,增强了催化剂的热稳定性能并提高了其使用寿命,同时也增加了催化剂粉体的储氧能力和对NO的吸附能力,从而提高了催化活性,明显降低了PM的起燃温度和最高活性工作温度,提高了其对NOx的最大还原率。该研究结果对同时去除船舶柴油机排气污染物PM和NO_x具有非常重要的工程应用价值。A mesoporous La/Ce/Zr composite oxide catalyst was prepared, in whichγ-Al_2O_3 worked as the main modification component to replace 60wt% of Ce/Zr solid solution matrix. The structures and performances of the composite oxide catalyst powder were characterized by ICP analyzer, X-ray Diffraction（XRD）, scanning electron microscope（SEM）, specific surface analyzer, laser particle size analyzer, thermal gravimetric analyzer（TGA） and other characterization techniques.The results showed that active Al_2O_3 modification significantly increased the catalyst powder specific surface areas and improved the sintering degree of the surface under high service temperature, which enhanced the thermal stability of the catalyst and increased its service life. Meanwhile, the oxygen storage capacity and the adsorption capacity to NO are increased also. These characteristics by the Al_2O_3 modification helped improving the catalytic activity to the reduction of NO_x and significantly reducing the ignition temperature and the highest active temperature to PM. The results of this study have an important engineering application value for the simultaneous removal of marine diesel engine exhaust pollutants of PM and NO_x.

关 键 词：氧化铝 介孔材料 稀土金属 催化特性 

分 类 号：TB331[一般工业技术—材料科学与工程]