Thermal transformation of alumina hydrolysates and gels synthesized from secbutoxyaluminium(III) modified with short-chain aliphatic acids dissolved in butyl ether

W N Martens; R L Frost; John R Bartlett; J T Kloprogge

doi:10.1016/S0040-6031(01)00487-7

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Thermal transformation of alumina hydrolysates and gels synthesized from secbutoxyaluminium(III) modified with short-chain aliphatic acids dissolved in butyl ether

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Thermal transformation of alumina hydrolysates and gels synthesized from secbutoxyaluminium(III) modified with short-chain aliphatic acids dissolved in butyl ether

W N Martens, R L Frost, John R Bartlett and J T Kloprogge

Thermochimica Acta, Vol.374(1), pp.31-43

2001

DOI: https://doi.org/10.1016/S0040-6031(01)00487-7

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Abstract

Analytical Chemistry

dehydration

dehydroxylation

differential thermal analysis

differential thermogravimetric analysis

alumina gel

gibbsite

boehmite

thermogravimetric analysis

trisecbutoxyaluminium(III)

A combination of X-ray diffraction and thermal analysis was employed to characterise alumina hydrolysates synthesised from the hydrolysis of anhydrous trisecbutoxyaluminium (III). X-ray diffraction showed that the alumino-oxy(hydroxy) hydrolysates were boehmite. For boehmite the lamellar spacings are in the b direction and multiple d(0 2 0) peaks are observed for the unaged hydrolysate. After 4 h of ageing, a single d(0 2 0) peak is observed at 6.53 Ã…. Thermal analysis showed five endotherms at 70, 140, 238, 351 and 445°C. These endotherms are attributed to the dehydration and dehydroxylation of the hydrolysate. Alumina oxy(hydroxy) gels were formed from the hydrolysates of anhydrous aliphatic acid modified trisecbutoxyaluminium(III). X-ray diffraction shows the gels were expanded above the (0 2 0) spacing of boehmite due to the incorporation of acid in the interlamellar space. The thermal analysis patterns of the acid modified gels were significantly different from that of the unmodified gel.

Details

Title: Thermal transformation of alumina hydrolysates and gels synthesized from secbutoxyaluminium(III) modified with short-chain aliphatic acids dissolved in butyl ether
Authors: W N Martens (Author) - Queensland University of Technology
R L Frost (Author) - Australian Nuclear Science and Technology Organisation
John R Bartlett (Author) - Queensland University of Technology
J T Kloprogge (Author) - Queensland University of Technology
Publication details: Thermochimica Acta, Vol.374(1), pp.31-43
Publisher: Elsevier BV
Date published: 2001
DOI: 10.1016/S0040-6031(01)00487-7
ISSN: 0040-6031
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449102702621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Chemistry, Analytical; Chemistry, Physical; Thermodynamics