Nanophase CuO powder was prepared with urea and copper nitrate by hydrothermal method.The effects of temperature on yield and particle sizes were studied.The results showed that the yield increased while the particle ...Nanophase CuO powder was prepared with urea and copper nitrate by hydrothermal method.The effects of temperature on yield and particle sizes were studied.The results showed that the yield increased while the particle sizes decreased with the increase of temperature.The sample particles were spherical and the average particle size was between 25 and 60 nm.展开更多
Different from the classical configuration CuO/CeO2 catalyst,the inverse configuration CeO2 /CuO catalyst （atomic ratio of Ce/Cu=10/100） was prepared by impregnation method.Five calcination temperatures were selecte...Different from the classical configuration CuO/CeO2 catalyst,the inverse configuration CeO2 /CuO catalyst （atomic ratio of Ce/Cu=10/100） was prepared by impregnation method.Five calcination temperatures were selected to investigate the interaction between CeO2 and CuO support.It is found that as calcination temperature increased from 500 to 900 C,sintering of CeO2 particles on the support occurred together with the diffusion of a portion of Ce 4＋ ions into CuO crystals,forming solid solution.Formation of interface complex Ce-O-Cu was suggested by TPR measurements.The catalyst calcined at 700 C gives the highest activity for preferential oxidation of CO in excess H2 stream.展开更多
文摘Nanophase CuO powder was prepared with urea and copper nitrate by hydrothermal method.The effects of temperature on yield and particle sizes were studied.The results showed that the yield increased while the particle sizes decreased with the increase of temperature.The sample particles were spherical and the average particle size was between 25 and 60 nm.
文摘Different from the classical configuration CuO/CeO2 catalyst,the inverse configuration CeO2 /CuO catalyst （atomic ratio of Ce/Cu=10/100） was prepared by impregnation method.Five calcination temperatures were selected to investigate the interaction between CeO2 and CuO support.It is found that as calcination temperature increased from 500 to 900 C,sintering of CeO2 particles on the support occurred together with the diffusion of a portion of Ce 4＋ ions into CuO crystals,forming solid solution.Formation of interface complex Ce-O-Cu was suggested by TPR measurements.The catalyst calcined at 700 C gives the highest activity for preferential oxidation of CO in excess H2 stream.
基金supported by the National Natural Science Foundation of China (20973151, 21273195)the Foundation of Jiangsu Provincial Key Program of Physical Chemistry in Yangzhou University~~
