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Conventional and Controlled Rate Thermal analysis of nesquehonite Mg(HCO3)(OH)•2(H2O)

Frost, Ray L., Hales, Matthew C., Locke, Ashley J., Vagvolgyi, Veronika, Kristof, Janos, & Horvath, Erzsebet (2008) Conventional and Controlled Rate Thermal analysis of nesquehonite Mg(HCO3)(OH)•2(H2O). Journal of Thermal Analysis and Calorimetry, 94(2), pp. 523-528.

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Abstract

The understanding of the thermal stability of magnesium carbonates and the relative metastability of hydrous carbonates including hydromagnesite, artinite, nesquehonite, barringtonite and lansfordite is extremely important to the sequestration process for the removal of atmospheric CO2. The conventional thermal analysis of synthetic nesquehonite proves that dehydration takes place in two steps at 157, 179 degrees Celsius and decarbonation at 416 degrees Celsius and 487 degrees Celsius. Controlled rate thermal analysis shows the first dehydration step is isothermal and the second quasi-isothermal at 108 and 145 degrees Celsius. In the CRTA experiment carbon dioxide is evolved at 376 degrees Celsius. CRTA technology offers better resolution and a more detailed interpretation of the decomposition processes of magnesium carbonates such as nesquehonite via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of non-isothermal nature reveal partial collapse of the nesquehonite structure

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13 citations in Scopus
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13 citations in Web of Science®

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ID Code: 15071
Item Type: Journal Article
Keywords: hydromagnesite, lansfordite, nesquehonite, magnesite, thermal analysis, CRTA, thermogravimetry
DOI: 10.1007/s10973-007-8844-7
ISSN: 1572-8943
Subjects: 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) > Catalysis and Mechanisms of Reactions (030601)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 Springer
Copyright Statement: The original publication is available at SpringerLink http://www.springerlink.com
Deposited On: 09 Oct 2008
Last Modified: 29 Feb 2012 23:49

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