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Citation: Cai Wei-Quan, Li Hui-Quan, Zhang Yi. Hydrothrmal Crystal Growth of Very Light Boehmite products[J]. Acta Physico-Chimica Sinica, ;2004, 20(07): 717-721. doi: 10.3866/PKU.WHXB20040710 shu

Hydrothrmal Crystal Growth of Very Light Boehmite products

1.
Institute of Process Engineering, the Key Laboratory of Green Process Engineering, Chinese Academy of Sciences, Beijing　100080;Graduate School of the Chinese Academy of Sciences, Beijing　100039

Received Date: 19 December 2003
Available Online: 15 July 2004

The hydrothermal precipitation in the Al2(SO4)3-CO(NH2)2-H2O system under the conditions of [Al3＋]=0.2 mol•L－1,[CO(NH2)2]:[Al3＋]=2:1 and 2 h at different temperatures has been studied. Very light boehmite powders in the form of porous agglomeration of several micron size covered with needle clusters are obtained at above 140 ℃.The reaction solution and the products are characterized by ICP-AES, XRD, FT-IR, SEM, BET and particle size distribution. The precipitation of aluminum hydroxide gel or amorphous powder is almost completed at 140 ℃. With the reaction temperature raised to 180 ℃, crystallinity of the products, whose tap density varies among 117.2～158.2 kg•m－3,becomes more perfect and the specific surface area increases from 75.3 m2•g－1 to 88.3 m2•g－1 as well. However, the average diameter decreases moderately. The γ-Al2O3 powders formed by calcination of aforementioned boehmites at 550 ℃ for 2 h have the same shape and higher specific surface area compared with their corresponding precursors.
- Very light boehmite;Hydrothermal synthesis;Uniform precipitation;　Crystal growth;γ-Al₂O₃
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