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Hydrothermal crystal growth of very light boehmite products
Alternative TitleActa Phys.-Chim. Sin.
Cai, WQ; Li, HQ; Zhang, Y
2004-07-01
Source PublicationACTA PHYSICO-CHIMICA SINICA
ISSN1000-6818
Volume20Issue:7Pages:717-721
AbstractThe hydrothermal precipitation in the Al-2(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 degreesC. 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 degreesC. With the reaction temperature raised to 180 degreesC, crystallinity of the products, whose tap density varies among 117.2 similar to 158.2 kg (.) m(-3), becomes more perfect and the specific surface area increases from 75.3 m(2) (.) g(-1) to 88.3 m(2) (.) g(-1) as well. However, the average diameter decreases moderately. The gamma-Al2O3 powders formed by calcination of aforementioned boehmites at 550 degreesC for 2 h have the same shape and higher specific surface area compared with their corresponding precursors.; The hydrothermal precipitation in the Al-2(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 degreesC. 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 degreesC. With the reaction temperature raised to 180 degreesC, crystallinity of the products, whose tap density varies among 117.2 similar to 158.2 kg (.) m(-3), becomes more perfect and the specific surface area increases from 75.3 m(2) (.) g(-1) to 88.3 m(2) (.) g(-1) as well. However, the average diameter decreases moderately. The gamma-Al2O3 powders formed by calcination of aforementioned boehmites at 550 degreesC for 2 h have the same shape and higher specific surface area compared with their corresponding precursors.
KeywordVery Light Boehmite Hydrothermal Synthesis Uniform Precipitation Crystal Growth Gamma-al2o3
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3866/PKU.WHXB20040710
URL查看原文
Indexed BySCI
Language英语
WOS KeywordALUMINUM NITRATE
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000222794400010
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/4945
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc Engn, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Cai, WQ,Li, HQ,Zhang, Y. Hydrothermal crystal growth of very light boehmite products[J]. ACTA PHYSICO-CHIMICA SINICA,2004,20(7):717-721.
APA Cai, WQ,Li, HQ,&Zhang, Y.(2004).Hydrothermal crystal growth of very light boehmite products.ACTA PHYSICO-CHIMICA SINICA,20(7),717-721.
MLA Cai, WQ,et al."Hydrothermal crystal growth of very light boehmite products".ACTA PHYSICO-CHIMICA SINICA 20.7(2004):717-721.
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