NDLI: Thermal decomposition of the composite hydrotalcites of iowaite and woodallite

Content Provider	Springer Nature Link
Author	Bouzaid, Jocelyn M. Frost, R. L. Martens, W. N.
Copyright Year	2007
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 CO$_{2}$ from reacting with the compounds and in this way the synthesized iowaite-woodallite series somewhat resembled the natural minerals.
Starting Page	511
Ending Page	519
Page Count	9
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	89
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-07-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dehydration dehydroxylation hydrotalcite iowaite thermogravimetric analysis woodallite Measurement Science, Instrumentation Inorganic Chemistry Physical Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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