Cu-Ce-La mixed oxides were prepared by three precipitation methods （coprecipitation, homogeneous precipitation, and deposition precipitation） with variable precipitators and characterized using X-ray diffraction, BE...Cu-Ce-La mixed oxides were prepared by three precipitation methods （coprecipitation, homogeneous precipitation, and deposition precipitation） with variable precipitators and characterized using X-ray diffraction, BET, temperature-programmed reduction, and catalytic reaction for the water-gas shift. The Cu-Ce-La mixed oxide prepared by coprecipitation method with NaOH as precipitator presented the highest activity and thermal stability. Copper ion substituted quadrevalent ceria entered CeO2 （111） framework was in favor of activity and thermal stability of catalyst. The crystallinity of fresh catalysts increased with the reduction process. La^3＋ or Ce^4＋ substituted copper ion entered the CeO2 framework during reduction process. The coexistence of surface copper oxide （crystalline） and pure bulk crystalline copper oxide both contributed to the high activity and thermal stability of Cu-Ce-La mixes oxide catalyst.展开更多
The Cu-La,Cu-Ce systems have been optimized using the recommended phase diagrams and the experi- mental thermodynamic values reported in the recent years.The optimization results are in good agreement with the experim...The Cu-La,Cu-Ce systems have been optimized using the recommended phase diagrams and the experi- mental thermodynamic values reported in the recent years.The optimization results are in good agreement with the experimental data.展开更多
基金supported by NSFC(21066008)the Major Program of Natural Science Foundation of Inner Mongolia(2009ZD01)+1 种基金key scientific and technological project of Inner Mongolia(20101501)the Talented Person Foundation of Inner Mongolia and the Program Foundation for Coal Chemistry Preponderant Discipline of IMUT
基金the Scientific Research Foundation for Returned Scholars of Ministry of Education, Inner Mongolia Natural Science Foundation (20041001)Chunhui Plan Ministry of Education and Inner Mongolia Talented Person Foundation
文摘Cu-Ce-La mixed oxides were prepared by three precipitation methods （coprecipitation, homogeneous precipitation, and deposition precipitation） with variable precipitators and characterized using X-ray diffraction, BET, temperature-programmed reduction, and catalytic reaction for the water-gas shift. The Cu-Ce-La mixed oxide prepared by coprecipitation method with NaOH as precipitator presented the highest activity and thermal stability. Copper ion substituted quadrevalent ceria entered CeO2 （111） framework was in favor of activity and thermal stability of catalyst. The crystallinity of fresh catalysts increased with the reduction process. La^3＋ or Ce^4＋ substituted copper ion entered the CeO2 framework during reduction process. The coexistence of surface copper oxide （crystalline） and pure bulk crystalline copper oxide both contributed to the high activity and thermal stability of Cu-Ce-La mixes oxide catalyst.
文摘The Cu-La,Cu-Ce systems have been optimized using the recommended phase diagrams and the experi- mental thermodynamic values reported in the recent years.The optimization results are in good agreement with the experimental data.
