Authors:
N. Voyer

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A. Soisnard

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

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

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

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Abstract  

Zn-Al hydrotalcites and Cu-Al hydrotalcites were synthesised by coprecipitation method and analysed by X-ray diffraction (XRD) and thermal analysis coupled with mass spectroscopy. These methods provide a measure of the thermal stability of the hydrotalcite. The XRD patterns demonstrate similar patterns to that of the reference patterns but present impurities attributed to Zn(OH)2 and Cu(OH)2. The analysis shows that the d003 peak for the Zn-Al hydrotalcite gives a spacing in the interlayer of 7.59 Å and the estimation of the particle size by using the Debye-Scherrer equation and the width of the d003 peak is 590 Å. In the case of the Cu-Al hydrotalcite, the d003 spacing is 7.57 Å and the size of the diffracting particles was determined to be 225 Å. The thermal decomposition steps can be broken down into 4 sections for both of these hydrotalcites. The first step decomposition below 100°C is caused by the dehydration of some water absorbed. The second stage shows two major steps attributed to the dehydroxylation of the hydrotalcite. In the next stage, the gas CO2 is liberated over a temperature range of 150°C. The last reactions occur over 400°C and involved CO2 evolution in the decomposition of the compounds produced during the dehydroxylation of the hydrotalcite.

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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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