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Thermal decomposition of the composite hydrotalcites of iowaite and woodallite

Frost, Ray L., Bouzaid, Jocelyn M., & Martens, Wayde N. (2007) Thermal decomposition of the composite hydrotalcites of iowaite and woodallite. Journal of Thermal Analysis and Calorimetry, 89(2), pp. 511-519.

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Abstract

The thermal stability and thermal decomposition pathways for synthesized composite iowaite /woodallite have been determined using thermogravimetry analysis in conjunction with evolved gas mass spectrometry. Dehydration of the hydrotalcites occurred over a range of 56-70 °C. The first dehydroxylation step occurred at around 255 °C and, with the substitution of more iron (III) for chromium (III) this temperature increased to an upper limit of 312 °C. This trend was observed throughout all decomposition steps. The release of carbonate ions as carbon dioxide gas initialised at just above 300 °C and was always accompanied by loss of hydroxyl units as water molecules. The initial loss of the anion in this case the chloride ion was consistently observed to occur at about 450 °C with final traces evolved at 535 to 780 °C depending of the Fe:Cr ratio and was detected as HCl (m/Z = 36). Thus for this to occur, hydroxyl units must have been retained in the structure at temperatures upwards of 750 °C. Experimentally it was found difficult to keep CO2 from reacting with the compounds and in this way the synthesized iowaite-woodallite series somewhat resembled the natural minerals.

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ID Code: 8841
Item Type: Journal Article
Keywords: dehydration, dehydroxylation, hydrotalcite, iowaite, woodallite, thermogravimetric analysis
DOI: 10.1007/s10973-006-7562-x
ISSN: 1388-6150
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Research Centres > Science Research Centre
Copyright Owner: Copyright 2007 Springer
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 01 Aug 2007
Last Modified: 29 Feb 2012 23:36

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