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Thermogravimetric analysis of hydrotalcites based on the takovite formula NixZn6-xAl2(OH)16(CO3).4H2O

Lin, Yu-Hsiang, Adebajo, Moses O., Frost, Ray L., & Kloprogge, J. Theo (2005) Thermogravimetric analysis of hydrotalcites based on the takovite formula NixZn6-xAl2(OH)16(CO3).4H2O. Journal of Thermal Analysis and Calorimetry, 81(1), pp. 83-90.

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Abstract

High resolution thermogravimetric analysis (HRTG) coupled to a gas evolution mass spectrometer has been used to study the thermal decomposition of zinc-modified takovites of formulae (NixZn6-xAl2(CO3)(OH)16.4H2O) where x varies from 0 to 6. X-ray diffraction data indicate an increase in the crystallinity and decrease in the interlayer spacing of the materials with increase in the zinc composition. HRTG and mass spectrometry results indicate that water is lost in two major steps, with carbon dioxide coming off simultaneously at the second step. Further loss of CO2 occurred at higher temperatures due to decomposition of carbonate chemically bound to layer Zn2+ and Al3+ cations. The variations of the temperatures of dehydration and dehydroxylation/decarbonation with the zinc composition are discussed in terms of the effects of stabilisation of the layer structure, the electronegativity of the layer metals, the charge-to-size ratio of the layer cations and the layer-interlayer hydrogen bonding interactions.

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ID Code: 1828
Item Type: Journal Article
Keywords: Decomposition reactions, high, resolution thermogravimetrtic analysis, mass spectrometric analysis, takovite, zinc, substituted hydrotalcites
DOI: 10.1007/s10973-005-0749-8
ISSN: 1572-8943
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Chemical Thermodynamics and Energetics (030602)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOCHEMISTRY (040200) > Inorganic Geochemistry (040202)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Solid State Chemistry (030206)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Springer
Copyright Statement: The original publication is available at SpringerLink
Deposited On: 13 Jul 2005
Last Modified: 29 Feb 2012 23:15

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