Thermal decomposition of the synthetic hydrotalcite woodallite

Frost, Ray L., Bouzaid, Jocelyne M., Martens, Wayde N., & Kloprogge, J. Theo (2006) Thermal decomposition of the synthetic hydrotalcite woodallite. Journal of Thermal Analysis and Calorimetry, 86(3), pp. 745-749.

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Abstract

The thermal stability and thermal decomposition pathways for synthetic woodallite have been determined using thermogravimetry in conjunction with evolved gas mass spectrometry. Chemical analysis showed the formula of the synthesised woodallite to be Mg6.28Cr1.72Cl(OH)16(CO3)0.36 •8.3H2O and X-ray diffraction confirms the layered LDH structure. Dehydration of the woodallite occurred at 65 degrees Celsius. Dehydroxylation occurred at 302 and 338 degrees Celsius. Both steps were associated with the loss of carbonate. Hydrogen chloride gas was evolved over a wide temperature range centred on 507 degrees Celsius. The products of the thermal decomposition were MgO and a spinel MgCr2O4. Experimentally it was found to be difficult to eliminate CO2 from inclusion in the interlayer during the synthesis of the woodallite compound and in this way the synthesised woodallite resembled the natural mineral.

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ID Code: 5313
Item Type: Journal Article
Refereed: Yes
Additional Information: This is one of a series of papers on hydrotalcites
Keywords: dehydration, dehydroxylation, hydrotalcite, woodallite, iowaite, high, resolution thermogravimetric analysis
DOI: 10.1007/s10973-005-7315-2
ISSN: 1572-8943
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Springer
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 25 Oct 2006 00:00
Last Modified: 29 Feb 2012 13:23

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