Synthesis of mesoporous CeO2-MnOx binary oxides and their catalytic performances for CO oxidation
来源期刊：JOURNAL OF RARE EARTHS2014年第2期
论文作者：詹望成 张欣烨 郭杨龙 王丽 郭耘 卢冠忠
文章页码：146 - 152
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 oC.This was ascribed to presence of more Mn species with higher oxidation state on the surface and the better reducibility over the Ce-Mn-1 catalyst than other CeO2-MnOx catalysts.
詹望成，张欣烨，郭杨龙，王丽，郭耘，卢冠忠
Key Laboratory for Advanced Materials,Research Institute of Industrial Catalysis,East China University of Science and Technology
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 oC.This was ascribed to presence of more Mn species with higher oxidation state on the surface and the better reducibility over the Ce-Mn-1 catalyst than other CeO2-MnOx catalysts.
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