Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 86: Issue 3
Thermal decomposition of the synthetic hydrotalcite woodallite
Authors:
J. M. Bouzaid Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street

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R. L. Frost Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street

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A. W. Musumeci Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street

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W. N. Martens Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street Queensland, Brisbane Australia 4001 GPO Box 2434 2 George Street

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Pages:
745–749
Online Publication Date:
27 Jun 2006
Publication Date:
01 Dec 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-7315-2
Keywords:
dehydration; dehydroxylation; high-resolution thermogravimetry; hydrotalcite; iowaite; woodallite
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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 65C. Dehydroxylation occurred at 302 and 338C. Both steps were associated with the loss of carbonate. Hydrogen chloride gas was evolved over a wide temperature range centred on 507C. 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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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