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以改性凹凸棒石为模板,通过无机物前驱体颗粒的自组装制备CeO2/SiO2复合材料,经热碱浸渍去除模板后煅烧得到CeO2纳米管。借助X射线粉末衍射、透射电子显微镜、选区电子衍射、场发射扫描电子显微镜、Raman光谱仪和N2气吸脱附仪等对CeO2纳米管的形貌和结构进行表征,考察了硝酸铈与活性氧化硅质量比对产物的影响。结果表明:当硝酸铈与活性SiO2纳米棒质量比为3:1时,CeO2纳米颗粒可以均匀包覆在活性SiO2纳米棒表面;优化参数后制备的CeO2纳米管外径和内径分别在50～100 nm和20～50 nm之间,与无孔CeO2相比,CeO2纳米管具有较好的CO催化效果。
The modified attapulgite was used as a template to prepare CeO2 / SiO2 composites by self-assembly of inorganic precursor particles. The template was calcined after removal of the template by hot alkali to obtain CeO2 nanotubes. The morphology and structure of CeO2 nanotubes were characterized by X-ray powder diffraction, transmission electron microscopy, selected area electron diffraction, field emission scanning electron microscopy, Raman spectroscopy and N2 gas adsorption desorption spectrometer. The effects of cerium nitrate and activated silica Effect of mass ratio on product. The results show that when the mass ratio of cerium nitrate to active SiO2 nanorods is 3: 1, the CeO2 nanoparticles can be uniformly coated on the surface of the active SiO2 nanorods. The optimal parameters of the prepared CeO2 nanotubes are 50-100 nm and 20 ~ 50 nm, CeO2 nanotubes have better CO catalytic activity than non-porous CeO2.