| 聚合氯化铝制备拟薄水铝石及γ-Al2O3的研究Ⅱ——表面活性剂影响探讨 | |
| Preparation of Pseudo-boehmite and γ-Al2O3 by Polyaluminum Chloride Ⅱ——Surfactant Influences | |
| 摘要: 本实验采用自制的聚合氯化铝溶液为原料，利用溶胶-凝胶法制备拟薄水铝石及其衍生物γ-Al2O3，采用XRD、TEM和N2吸附法对样品进行表征和分析，探讨了不同pH值、不同合成温度以及不同pluronic表面活性剂对产物结构性质的影响。结果表明：当pH值为8.5时水合氧化铝以拟薄水铝石为主；当温度为70 ℃时制备的产物为拟薄水铝石晶相。随着表面活性剂L64、L65和F68分子量的增加，生成的拟薄水铝石及其衍生物γ-Al2O3的物相结晶度升高，但产物的晶相没有改变。所制备的拟薄水铝石在500 ℃焙烧6 h后均得到γ-Al2O3，其中表面活性剂为L65时扩孔效果最佳，比表面积、孔容和孔径分别为231 m2·g-1、0.28 cm3·g-1和4.52 nm。 | |
| 关键词: 聚合氯化铝 拟薄水铝石 γ-Al2O3 pluronic | |
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| Abstract: Pseudo-boehmite and its derivative γ-Al2O3 were prepared from polyaluminum chloride by sol-gel method. The samples were characterized by XRD, TEM and N2 adsorption-desorption techniques. Effects of pH value, preparation temperature and species of pluronic surfactants on the physical properties of pseudo-boehmite were investigated. Results show that alumina hydrate is mainly pseudo-boehmite prepared at pH value near 8.5 and at temperature value near 70 ℃. With the increase of pluronic surfactants molecular weight, the degree of crystallinity of pseudo-boehmite and its derivative γ-Al2O3 increases. It is proved that phases of products do not change after adding the pluronic surfactants L64, L65 and F68. The γ-Al2O3 phases are obtained after 6 hours calcination of the pseudo-boehmite at 500 ℃. L65 is the most suitable for increasing surface area of γ-Al2O3, surface area of 231 m2·g-1, pore volume of 0.28 cm3·g-1 and pore size of 4.52 nm was obtained. | |
| Keywords: polyaluminum chloride pseudo-boehmite γ-Al2O3 pluronic | |
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| 王园园,赵长伟,何劲松,闫 勇,张香兰,栾兆坤.聚合氯化铝制备拟薄水铝石及γ-Al2O3的研究Ⅱ——表面活性剂影响探讨[J].无机化学学报,2012,28(2):302-306. | |
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