Synthesis and Characterization of Y-Doped Mesoporous CeO2 Using A Chemical Precipitation Method
来源期刊：JOURNAL OF RARE EARTHS2007年第4期
论文作者：Xu Dayu Qiu Guanzhou Li Yukun Jiang Nan Song Xiaolan
Key words：mesoporous ceria; Y-doped; chemical precipitation method; synthesis; characterization; rare earths;
Abstract: Using cetyltrimethylammonium bromide (CTAB) as the template agent, cerium nitrate as the cerium resource, yttrium nitrate as the yttrium resource, and ammonium carbonate as the precipitating agent, mesoporous CeO2 powders doped with different yttrium contents were successfully synthesized using a chemical precipitation method, under an alkalescent condition. Properties of the obtained samples were characterized and analyzed with X-ray diffraction (XRD), energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM), infrared (IR) absorbance, and the BET method. For the prepared samples with 20% (molar ratio) Y-doped content, a BET specific surface area of 106.6 m2·g-1, with an average pore size of 3.27 nm were obtained. XRD patterns showed that the doped samples were with a cubic fluorite structure. TEM micrographs revealed that the doped samples showed a spherical morphology with a diameter ranging from 20 to 30 nm and a round pore shape. IR results indicated that the Ce-O-Ce vibration intensity decreased as the Y-doped content increased. N2 adsorption-desorption isotherms showed that the samples possessed typical mesopore characteristics. The average pore size of the samples decreased after mesoporous CeO2 was doped with yttrium, and the average pore size decreased largely as the Y-doped content increased.
Xu Dayu1，Qiu Guanzhou1，Li Yukun1，Jiang Nan1，Song Xiaolan1
(1.Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:Using cetyltrimethylammonium bromide (CTAB) as the template agent, cerium nitrate as the cerium resource, yttrium nitrate as the yttrium resource, and ammonium carbonate as the precipitating agent, mesoporous CeO2 powders doped with different yttrium contents were successfully synthesized using a chemical precipitation method, under an alkalescent condition. Properties of the obtained samples were characterized and analyzed with X-ray diffraction (XRD), energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM), infrared (IR) absorbance, and the BET method. For the prepared samples with 20% (molar ratio) Y-doped content, a BET specific surface area of 106.6 m2·g-1, with an average pore size of 3.27 nm were obtained. XRD patterns showed that the doped samples were with a cubic fluorite structure. TEM micrographs revealed that the doped samples showed a spherical morphology with a diameter ranging from 20 to 30 nm and a round pore shape. IR results indicated that the Ce-O-Ce vibration intensity decreased as the Y-doped content increased. N2 adsorption-desorption isotherms showed that the samples possessed typical mesopore characteristics. The average pore size of the samples decreased after mesoporous CeO2 was doped with yttrium, and the average pore size decreased largely as the Y-doped content increased.
Key words:mesoporous ceria; Y-doped; chemical precipitation method; synthesis; characterization; rare earths;
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