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 ZHAN Wangcheng;ZHANG Xinye;GUO Yanglong;WANG Li;GUO Yun;LU Guanzhong

作者机构：Key Laboratory for Advanced MaterialsResearch Institute of Industrial CatalysisEast China University of Science and Technology 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2014年第32卷第2期

页      面：146-152页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 0703[理学-化学] 

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) 

主　　题：mesoporous composite oxides ceria manganese oxide hydrothermal synthesis CO oxidation rare earths 

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.