以棉花为模板、经硝酸铈溶液浸渍后煅烧,合成多孔结构的生物形态二氧化铈微管材料.采用场发射扫描电子显微镜(FESEM)、X射线衍射(XRD)、透射电子显微镜(TEM)、N2吸脱附程序升温还原(TPR)和CO氧化等手段对样品进行表征.结果表明,合成的材料是由尺寸约9 nm的晶粒组成,复制出原模板的纤维形貌,比表面积(BET)为62.3 m2/g.与传统CeO2微粒相比,在CO氧化实验中,所合成的材料表现出极高的催化活性.所合成的纤维状CeO2在320℃下CO的转化率约为90%,在410℃下CO的转化率达到100%.
A biomorphic CeO2 microtube with multiple-pore structure was fabricated by using the cotton as biotemplate, through cerium nitrate solution infiltration and thermal decomposition. Field emission scanning electron microscope (FESEM), powder X-ray diffraction (XRD), transmission electron microscope (TEM), N2 adsorption?desorption isotherms, temperature-programmed reduction (TPR) and CO oxidation were used to characterize the samples. The results indicated that the synthesized products were composed of crystallites with grain size about 9 nm and exhibited a fibrous morphology similar to the original template and possessed a specific surface area (BET) of 62.3 m2/g. Compared with the conventional CeO2particles, the synthesized materials showed a superior catalytic activity for CO oxidation. For the synthesized fibrous CeO2, the CO conversion at 320 °C was above 90% and a 100% CO conversion was obtained at 410 °C.
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