稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
2期
146-152
,共7页
詹望成%张欣烨%郭杨龙%王丽%郭耘%卢冠忠
詹望成%張訢燁%郭楊龍%王麗%郭耘%盧冠忠
첨망성%장흔엽%곽양룡%왕려%곽운%로관충
mesoporous composite oxides%ceria%manganese oxide%hydrothermal synthesis%CO oxidation%rare earths
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 oxida-tion state on the surface and the better reducibility over the Ce-Mn-1 catalyst than other CeO2-MnOx catalysts.
