采用模板法制备高比表面积纳米CeO_2. 详细考察了铈盐和NaOH滴加速度、晶化时间和温度、铈盐种类、表面活性剂用量等对CeO_2比表面、晶粒尺寸的影响. 结果表明, 当CeCl_3加入速度=2.5 ml·min~(-1)、 NaOH加入速度=3 ml·min-1、晶化温度=90 ℃、晶化时间=24 h、 CeCl3∶ C_(12)H_(25)SO_4Na∶ NaOH∶ H2O=1∶ 2.7∶ 7.3∶ 1100(摩尔比)、焙烧温度=200 ℃时, CeO_2的比表面积和晶粒尺寸分别为457 m~2·g~(-1)和2.0 nm. 这种高比表面纳米CeO_2与常规CeO_2相比, 具有独特的物理、化学性质, 有望成为一种应用广泛的新型材料.
A series of nano-sized CeO_2 particles with high specific surface area were synthesized using a surfactant-assisted method. Variation of preparation conditions, such as addition rate of Ce salt and NaOH, aging time and temperature, kinds of Ce salts, amount of surfactants, resulted in differences in surface area and crystallite size of CeO_2. CeO_2 with the highest specific surface area (457 m~2·g~(-1) and particle size of 2 nm was synthesized under the optimized condition, with a CeCl_3 addition rate of 2.5 ml·min~(-1), NaOH addition rate of 3 ml·min~(-1), aging temperature of 90 ℃, aging time of 24 h, CeCl_3∶ C_(12)H_(25(SO_4Na∶NaOH∶ H2O of 1∶ 2.7∶ 4.3∶ 1100 (molar) and calcination temperature of 200 ℃. Compared with normal CeO_2, the high-surface area CeO_2 had unique physical and chemical properties, so it could be a promising material with potential application.
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