Thermal decomposition of precipitated low bulk density basic aluminium sulfate

Bhattacharya  IN; Gochhayat  PK; Mukherjee  PSPaul  SMitra  PK

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Thermal decomposition of precipitated low bulk density basic aluminium sulfate

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Hydrated basic aluminium sulfates (BAS) are of great importance as precursor material for the preparation of activated and high pure calcined aluminas. Low bulk density category BAS powders have superior quality over higher bulk density varieties in terms of higher surface area, more active sites for adsorption, etc. A brief description on the processing route of low bulk density BAS powders utilizing aluminium sulfate and ammonia as hydrolyzing precipitant has been presented. Low Al3+ concentration and pH of around 7-7.2 were found to be crucial for formation of such material. Characterization of this low bulk density material and its different calcined products was also carried out. The characterization was performed through XRD, FTIR and DTA studies. The XRD analysis indicated precipitated powder to be an amorphous material. Interestingly, this amorphous structure is retained till 800degreesC. At 900degreesC, eta-Al2O3 phase appears to be the only transitional phase during its transformation to alpha-Al2O3 at 1100-1200degreesC. FTIR study showed characteristic vibration modes related to molecular water, co-ordinated sulfate and Al-O bonds. (C) 2004 Elsevier B.V. All rights reserved.

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《Materials Chemistry and Physics》 |2004年第1期|32-40|共9页
作者
Bhattacharya IN; Gochhayat PK; Mukherjee PSPaul SMitra PK;
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作者单位

Reg Res Lab, Bhubaneswar 751013, Orissa, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
basic alummium sulfate; eta-alumina; alpha-alumina; bulk density; XRD; FTIR; HIGH-PURITY ALUMINA; AQUEOUS-SOLUTIONS; HYDROXIDES; BEHAVIOR; SPECTRA; OXIDES; SALTS; GELS;

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Thermal decomposition of precipitated low bulk density basic aluminium sulfate

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