Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 96: Issue 2
Thermal decomposition of hydrotalcite with hexacyanoferrate(II) and hexacyanoferrate(III) anions in the interlayer
A controlled rate thermal analysis study
Authors:
Sara Palmer Queensland University of Technology Inorganic Materials Research Program, School of Physical and Chemical Sciences 2 George Street GPO Box 2434 Brisbane Queensland 4001 Australia

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J. Kristóf University of Pannonia Department of Analytical Chemistry 8201 Veszprém PO Box 158 Pannonia Hungary

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Veronika Vágvölgyi University of Pannonia Department of Analytical Chemistry 8201 Veszprém PO Box 158 Pannonia Hungary

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Erzsébet Horváth University of Pannonia Department of Environmental Engineering and Chemical Technology 8201 Veszprém PO Box 158 Pannonia Hungary

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

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Pages:
449–454
Online Publication Date:
13 Jan 2009
Publication Date:
01 May 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9448-6
Keywords:
controlled rate thermal analysis (CRTA); hexacyanoferrate(II); hexacyanoferrate(III); hydrotalcite
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Abstract  

The mechanism for the decomposition of hydrotalcite remains unsolved. Controlled rate thermal analysis enables this decomposition pathway to be explored. The thermal decomposition of hydrotalcites with hexacyanoferrate(II) and hexacyanoferrate(III) in the interlayer has been studied using controlled rate thermal analysis technology. X-ray diffraction shows the hydrotalcites have a d(003) spacing of 10.9 and 11.1 Å which compares with a d-spacing of 7.9 and 7.98 Å for the hydrotalcite with carbonate or sulphate in the interlayer. Calculations show dehydration with a total loss of 7 moles of water proving the formula of hexacyanoferrate(II) intercalated hydrotalcite is Mg6Al2(OH)16[Fe(CN)6]0.5·7H2O and 9.0 moles for the hexacyanoferrate(III) intercalated hydrotalcite with the formula of Mg6Al2(OH)16[Fe(CN)6]0.66·9H2O. CRTA technology indicates the partial collapse of the dehydrated mineral. Dehydroxylation combined with CN unit loss occurs in two isothermal stages at 377 and 390°C for the hexacyanoferrate(III) and in a single isothermal process at 374°C for the hexacyanoferrate(III) hydrotalcite.

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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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