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Thermal decomposition of hydrotalcites with variable cationic ratios

Frost, Ray L., Palmer, Sara J., & Spratt, Henry J. (2009) Thermal decomposition of hydrotalcites with variable cationic ratios. Journal of Thermal Analysis and Calorimetry, 95(1), pp. 123-129.

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Abstract

Thermal analysis complimented with evolved gas mass spectrometry has been applied to hydrotalcites containing carbonate prepared by coprecipitation and with varying divalent-trivalent cation ratio. The resulting materials were characterized by XRD, and TGA/DTG to determine the stability of the hydrotalcites synthesised. Hydrotalcites of formula Mg4(Fe,Al)2(OH)16(CO3,Cl).4H2O, Mg6(Fe,Al)2(OH)16(CO3,Cl).4H2O, and Mg8(Fe,Al)2(OH)16(CO3,Cl).4H2O formed by intercalation with the carbonate anion as a function of divalent/trivalent cationic ratio show variation in the d-spacing attributed to the size of the cation. The thermal decomposition of carbonate hydrotalcites consist of two decomposition steps between 300 and 400 ˚C, attributed to the simultaneous dehydroxylation and decarbonation of the hydrotalcite lattice. Water loss ascribed to dehydroxylation occurs in two decomposition steps, where the first step is due to the partial dehydroxylation of the lattice, while the second step is due to the loss of water interacting with the interlayer anions. Dehydroxylation results in the collapse of the hydrotalcite structure to that of its corresponding metal oxides, including MgO, MgAl2O4, and MgFeAlO4.

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ID Code: 18530
Item Type: Journal Article
Keywords: hydrotalcite; pyroaurite; carbonate; X-ray Diffraction, thermal analysis
ISSN: 1388-6150
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Solution Chemistry (030605)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Chemical Thermodynamics and Energetics (030602)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2009 Springer Science + Business Media
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 09 Mar 2009 09:50
Last Modified: 06 May 2014 09:45

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