以水、乙醇和乙二醇为溶剂,采用溶剂热法可控制备了0,1,3维CeO2.结果表明,0维CeO2由0.2～0.5 μm纳米粒子组成；1维CeO2是直径为25～30 μm,长约500 μm的六方棒;松针型的3维CeO2是由以纳米粒子为单元构成的直径为1～5 μm,长约50 μm的光滑棒组成,其比表面积高达234 m2/g.将0,1,3维CeO2负载的CuO催化剂用于CO氧化反应中,发现以1维和3维CeO2为载体时,CuO催化剂具有较大的比表面积和较强的表面还原性,因而表现出较高的催化活性.
A method to synthesize zero,one,and three dimensional (0D,1D,3D) CeO2 from single crystal cerium formate by a surfactant-free route using H2O,ethanol and ethylene glycol as solvents is shown.0D CeO2 was composed of aggregated particles of 0.2-0.5 μm.1D CeO2 was hexagonal rods that were 25-30 μm in width and more than 500 μm in length.The pine needle shaped 3D CeO2 was assembled from smooth rods of 1 to 5 μm diameter and up to 50 μm length that had CeO2 nanoparticles as building units to give 3D micro/nanoeomposite structures with a high BET surface area of 234 m2/g.Both 5 wt％ CuO/1D CeO2 and 5 wt％ CuO/3D CeO2 exhibited high catalytic activities for CO conversion due to the high BET surface area and the facile reducibility of surface CeO2.
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