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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2004,Vol.20>> Issue(07)>> 717-721     doi: 10.3866/PKU.WHXB20040710         中文摘要
Hydrothrmal Crystal Growth of Very Light Boehmite products
Cai Wei-Quan;Li Hui-Quan;Zhang Yi
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
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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.

Keywords: Very light boehmite   Hydrothermal synthesis   Uniform precipitation    Crystal growth   γ-Al2O3  
Received: 2003-12-19 Accepted: 2004-03-04 Publication Date (Web): 2004-07-15
Corresponding Authors: Cai Wei-Quan Email: wqcai@home.ipe.ac.cn


Cite this article: Cai Wei-Quan;Li Hui-Quan;Zhang Yi. Hydrothrmal Crystal Growth of Very Light Boehmite products[J]. Acta Phys. -Chim. Sin., 2004,20 (07): 717-721.    doi: 10.3866/PKU.WHXB20040710
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