| 高比表面CexZr1-xO2复合氧化物的制备及表征 |
| Preparation and Characterization of High Specific Surface Area CexZr1-xO2 Mixed Oxide |
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| 摘要: 分别采用共沉淀法和阴离子表面活性剂模板法制备了CexZr1-xO2复合氧化物。采用XRD、AFM、FTIR以及N2吸附-脱附等方法对样品进行了表征。结果表明，共沉淀法合成的样品在500 ℃煅烧2 h后，生成了立方相Ce0.75Zr0.25O2和四方相Ce0.5Zr0.5O2固溶体，比表面积为62.1 m2·g-1，孔体积为0.097 cm3·g-1；以阴离子表面活性剂十二烷基苯磺酸钠(SDBS)为模板剂，乙二胺为助模板剂合成的样品在500 ℃煅烧2 h后，生成了纯四方相Ce0.5Zr0.5O2固溶体，比表面积为180 m2·g-1，孔体积为0.182 cm3·g-1。结果表明，以阴离子表面活性剂SDBS为模板剂，可以合成高比表面积且具有介孔结构的Ce0.5Zr0.5O2复合氧化物；加入乙二胺作为助模板剂可明显的提高比表面积和孔体积。 |
| 关键词: 阴离子表面活性剂 铈锆固溶体 介孔 比表面积 |
| 基金项目: |
| Abstract: CexZr1-xO2 mixed oxides were synthesized by co-precipitation reaction and anionic surfactant-assisted route, respectively. XRD, AFM, FTIR and N2 adsorption-desorption have been used for structural characterizations. The results show that the product prepared by co-precipitation reaction consists of cubic Ce0.75Zr0.25O2 and tetragonal Ce0.5Zr0.5O2 after calcination under 500 ℃ for 2 h, the specific surface area and total pore volume are 95.1 m2·g-1 and 0.097 cm3·g-1, respectively； the product prepared by anionic surfactant-assisted route has a pure tetragonal phase Ce0.5Zr0.5O2 solid solution after calcination under 500 ℃ for 2 h, the specific surface area and total pore volume are 180 m2·g-1 and 0.182 cm3·g-1, respectively. The use of SDBS as template agent can successfully synthesize mesoporous Ce0.5Zr0.5O2 solid solution with high specific surface area and the use of ethylenediamine as assisted-template agent can improve specific surface area and total pore volume. |
| Keywords: anionic surfactant ceria-zirconia solid solution mesoporous specific surface area |
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| 古映莹,冯圣生,李金林,宋丰轩,秦利平.高比表面CexZr1-xO2复合氧化物的制备及表征[J].无机化学学报,2006,22(9):1623-1627. |
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