MIL-53(Al)与Al_2O_3负载铜铈催化剂的制备及CO氧化性能对比

Comparison of MIL-53(Al) and Al_2O_3 supported copper and ceriumcatalysts in the CO catalytic oxidation reaction

以新型金属有机骨架材料MIL-53(Al)和传统多孔材料Al_2O_3为载体,采用满孔浸渍法负载铜铈金属离子,分别得到(Cu-Ce)/MIL-53(Al)催化剂与(Cu-Ce)/Al_2O_3催化剂用于CO氧化,对两种材料的催化性能进行了对比研究。样品通过X射线衍射(XRD)、透射电子显微镜(TEM)以及N_2物理吸附-脱附等方法进行表征。结果表明,载体MIL-53(Al)的比表面积高于Al_2O_3的比表面积,MIL-53(Al)上负载的铜铈颗粒分布均匀且粒径小于Al_2O_3上铜铈颗粒粒径。在CO氧化反应中,MIL-53(Al)负载铜铈催化剂的催化活性明显高于Al_2O_3负载的铜铈催化剂,(Cu-Ce)/MIL-53(Al)催化剂在120~130℃时使CO氧化的转化率达到100%,(Cu-Ce)/Al_2O_3催化剂在205~235℃时使CO氧化的转化率达到100%。

Metal-organic framework material MIL-53（Al）has been synthesised by solvothermal method,serving as a support material of cerium doped copper catalyst（Ce-Cu）/MIL-53（Al） for CO oxidation.Comparison on the catalytic performance between（Cu-Ce）/MIL-53（Al） and the（Cu-Ce）/Al2O3 catalytic material was conducted to understand the catalytic behavior of catalysts.The catalysts were characterized by N2 adsorption-desorption,X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The temperature for 100% oxidation of CO on（Cu-Ce）/MIL-53（Al） catalyst was located at 120~130℃,but the temperature for 100% oxidation of CO on（Cu-Ce）/Al2O3 catalyst was located at 205~235℃.Therefore,the heterogeneous catalytic composite materials（Cu-Ce）/MIL-53（Al） exhibited much higher activity than that of（Cu-Ce）/Al2O3 in CO oxidation test.