| 聚合氯化铝制备球形拟薄水铝石和γ-Al2O3的研究Ⅰ——制备条件探讨 | |
| Preparation of Pseudo-boehmite and γ-Al2O3 Granules by Polyaluminum Chloride Ⅰ——Preparation Conditions | |
| 摘要: 采用实验室自制的聚合氯化铝为原料，结合溶胶-凝胶法和油滴法制备球形拟薄水铝石及其衍生物γ-Al2O3，采用XRD, TEM和N2吸附法对样品进行了分析表征，探讨了不同pH值、不同铝形态含量的聚合氯化铝、不同煅烧温度及不同表面活性剂对产物结构性质的影响。结果表明：pH值在8.5附近合成的水合氧化铝以拟薄水铝石为主；高Alc含量的聚合氯化铝有利于形成高比表面积的球形产物；在450~750 ℃下煅烧产物为球形γ-Al2O3，并且随温度升高，产物比表面积下降、孔径增大，孔容变化不明显，在1 000 ℃下煅烧产物为球形θ-Al2O3与γ-Al2O3的混合物；随着聚乙二醇表面活性剂分子量的增加，所得球形γ-Al2O3的孔容和孔径增大，聚乙二醇10000的扩孔效果最好，450 ℃下煅烧所得球形γ-Al2O3的比表面积、孔容分别达326 m2·g-1、0.55 cm3·g-1。 | |
| 关键词: 聚合氯化铝 球形拟薄水铝石 制备 Al2O3 聚乙二醇 | |
| 基金项目: | |
| Abstract: Pseudo-boehmite granules and their derivatives γ-Al2O3 were prepared from polyaluminum chloride by sol-gel method and oil-drop method. The samples were characterized by XRD, TEM and nitrogen adsorption-desorption techniques. The effects of pH value, Al species content of polyaluminum chloride, calcination temperature and surfactant on the physical properties of pseudo-boehmite granules were investigated. The results show that alumina hydrate is mainly pseudo-boehmite prepared at pH value near 8.5. Polyaluminum chloride with high content of Alc enhances the surface area of granules. γ-Al2O3 granules can be obtained at 450 ℃ to 750 ℃. The surface area decreases and pore size increases while pore volume changes little with the increase of calcination temperature. At 1 000 ℃, the granules show θ-Al2O3 and γ-Al2O3 phases. With the increase of PEG molecular weight, the pore volume and pore size of γ-Al2O3 granules increase. PEG10000 is most suitable for increasing surface area of γ-Al2O3, with surface area of 326 m2·g-1 and pore volume of 0.55 cm3·g-1 obtained at 450 ℃. | |
| Keywords: polyaluminum chloride pseudo-boehmite granule preparation Al2O3 polyethylene glycol | |
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| 何劲松,赵长伟,屠梦波,倪 帆,王 涛,栾兆坤.聚合氯化铝制备球形拟薄水铝石和γ-Al2O3的研究Ⅰ——制备条件探讨[J].无机化学学报,2010,26(9):1533-1538. | |
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