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为了研究模板对介孔氧化铈催化性能的影响,采用KIT-6和介孔碳模板合成了2种介孔氧化铈,考察并比较了其对CO的催化氧化性能。通过X射线衍射、透射电镜、氮气吸脱附、傅里叶红外光谱分析、X射线荧光光谱分析等测试手段对介孔氧化铈结构进行了分析。结果表明,2种介孔氧化铈均为有序介孔材料,且比表面积及孔结构差别不大,但以KIT-6为模板制备的介孔氧化铈表面含有3.3%的氧化硅。以介孔碳为模板制备的氧化铈催化活性更好,主要原因是以KIT-6为模板制备的氧化铈表面残留的SiO_2阻碍催化反应。
In order to study the influence of template on the catalytic performance of mesoporous cerium oxide, two mesoporous cerium oxides were synthesized by using KIT-6 and mesoporous carbon templates. The catalytic oxidation of CO was investigated and compared. The structure of mesoporous cerium oxide was analyzed by X-ray diffraction, transmission electron microscopy, nitrogen adsorption and desorption, Fourier transform infrared spectroscopy and X-ray fluorescence spectroscopy. The results showed that mesoporous cerium oxide was ordered mesoporous materials with little difference in specific surface area and pore structure. However, the surface of mesoporous cerium oxide prepared by using KIT-6 as template had 3.3% of silicon oxide. The catalytic activity of cerium oxide prepared by using mesoporous carbon as a template is better. The main reason is that the residual SiO 2 on the surface of cerium oxide prepared by KIT-6 blocks the catalytic reaction.