论文部分内容阅读
在碱性条件下,采用Brij35、Brij35+CTAB、Brij35+PEG20000为模板剂合成了m-CeO2,考察了模板剂种类、合成温度、老化温度及焙烧温度等因素对m-CeO2性能的影响,运用XRD、FT-IR、TEM、N2吸附-脱附和比表面-孔径测定等手段对m-CeO2进行了表征。结果表明,表面活性剂的种类、合成温度、老化温度及焙烧温度对介孔材料的性能有较大影响。以Brij35+CTAB为复合模板剂,合成温度、老化温度及焙烧温度分别为40℃、60℃及450℃时,所制备的m-CeO2-BC,其比表面积、孔容、平均孔径和孔壁厚度分别为137.9m2/g、0.194 cm3/g、4.9nm和0.010nm,且孔径分布较集中,晶粒尺寸为5.9nm,为纳米介孔材料。
Under basic conditions, m-CeO2 was synthesized by using Brij35, Brij35 + CTAB and Brij35 + PEG20000 as templates, and the influence of template type, synthesis temperature, aging temperature and calcination temperature on the performance of m-CeO2 was investigated. X-ray diffraction (XRD), FT-IR, TEM, N2 adsorption-desorption and specific surface area-pore size measurements were used to characterize m-CeO2. The results show that the type of surfactant, synthesis temperature, aging temperature and calcination temperature have a great influence on the properties of mesoporous materials. The specific surface area, pore volume, average pore diameter and pore wall of m-CeO2-BC prepared by using Brij35 + CTAB as complex templating agent, synthesis temperature, aging temperature and calcination temperature were 40 ℃, 60 ℃ and 450 ℃ respectively. The thicknesses are 137.9m2 / g, 0.194 cm3 / g, 4.9nm and 0.010nm, respectively. The pore size distribution is more concentrated and the grain size is 5.9nm, which is a nano-mesoporous material.