Synthesis of mesoporous CeO_2-MnO_x binary oxides and their catalytic performances for CO oxidation  

作　　者：詹望成 张欣烨 郭杨龙 王丽 郭耘 卢冠忠 

机构地区：[1]Key Laboratory for Advanced Materials,Research Institute of Industrial Catalysis,East China University of Science and Technology

出　　处：《Journal of Rare Earths》2014年第2期146-152,共7页稀土学报（英文版）

基　　金：supported by National Basic Research Program of China(2010CB732300,2013CB933201);National High Technology Research and Development Program of China(2011AA03A406,2012AA062703);the National Natural Science Foundation of China(21103048,21273150);Shu Guang Project of Shanghai Municipal Education Commission;Shanghai Education Development Foundation(10SG30)

摘　　要：Mesoporous CeO2-MnOx binary oxides with different Mn/Ce molar ratios were prepared by hydrothermal synthesis and characterized by scanning electron microscopy （SEM）, N2 sorption, X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and H2 temperature-programmed reduction （H2-TPR）. The characterization results indicated that the CeO2-MnOx catalysts exhibited flower-like microspheres with high specific surface areas, and partial Mn cations could be incorporated into CeO2 lattice to form solid solution. The CeO2-MnOx catalysts showed better catalytic activity for CO oxidation than that prepared by the coprecipitation method. Furthermore, the CeO2-MnOx catalyst with Mn/Ce molar ratio of 1 in the synthesis gel （Ce-Mn-1） exhibited the best catalytic activity, over which the conversion of CO could achieve 90% at 135 ℃. This was ascribed to presence of more Mn species with higher oxida- tion state on the surface and the better reducibility over the Ce-Mn-I catalyst than other CeO2-MnOx catalysts.Mesoporous CeO2-MnOx binary oxides with different Mn/Ce molar ratios were prepared by hydrothermal synthesis and characterized by scanning electron microscopy （SEM）, N2 sorption, X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and H2 temperature-programmed reduction （H2-TPR）. The characterization results indicated that the CeO2-MnOx catalysts exhibited flower-like microspheres with high specific surface areas, and partial Mn cations could be incorporated into CeO2 lattice to form solid solution. The CeO2-MnOx catalysts showed better catalytic activity for CO oxidation than that prepared by the coprecipitation method. Furthermore, the CeO2-MnOx catalyst with Mn/Ce molar ratio of 1 in the synthesis gel （Ce-Mn-1） exhibited the best catalytic activity, over which the conversion of CO could achieve 90% at 135 ℃. This was ascribed to presence of more Mn species with higher oxida- tion state on the surface and the better reducibility over the Ce-Mn-I catalyst than other CeO2-MnOx catalysts.

关 键 词：mesoporous composite oxides CERIA manganese oxide hydrothermal synthesis CO oxidation rare earths 

分 类 号：O643.36[理学—物理化学]