目的:探究FeOx掺杂对CeO2纳米晶的晶体结构和形貌,及甲烷氯氧化反应性能的影响.方法:样品晶体结构采用XRD表征;形貌采用TEM和HRTEM表征;考察CeO2和FeOx-CeO2纳米棒不同反应温度时甲烷氯氧化反应性能,计算表观活化能.结果:CeO2掺杂FeOx后,CeO2晶胞略微收缩.FeOx-CeO2纳米棒反应后,具有向纳米立方体变化的趋势;FeOx-CeO2纳米立方体反应前后,其形貌和尺寸几乎没有变化.CeO2纳米棒掺杂FeOx后,表观活化能由106 kJ/mol下降到84 kJ/mol.结论:CeO2与FeOx可能形成了固溶体,CeO2掺杂FeOx提高了其甲烷氯氧化反应性能.%Objective: The paper is to study the influence of FeOx doping into CeO2nanocrystal on the crystal structure, morphology and the catalytic performance on oxidative chlorination of methane. Methods: Crystal structure of materials was detected by XRD, and the morphology was observed by TEM and HRTEM. Catalytic performance on the oxidative chlorination of methane over CeO2and FeOx-CeO2 nanorods at different reaction temperatures was investigated, and the apparent activation energy was also calculated. Results: The unit cell of CeO2nanocatalysts contracted slightly after doping with FeOx. The morphology of FeOx-CeO2 nanorods had a trend of changing into cube after reaction. However, for FeOx-CeO2nanocubes, the morphology and size were almost unchanged. For CeO2nanorods, the apparent activation energy was dropped from 106 kJ/mol to 84 kJ/mol after doping with FeOx. Conclusion: CeO2 and FeOxprobably formed solid solution. The catalytic performance on the oxidative chlorination of methane was improved for CeO2 nanocatslysts after doping with FeOx.
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