Controlled Rate Thermal analysis of hydromagnesite
Frost, Ray L., Hales, Matthew C., Locke, Ashley J., Kristof, Janos, Horvath, Erzsebet, & Vagvolgyi, Veronika (2008) Controlled Rate Thermal analysis of hydromagnesite. Journal of Thermal Analysis and Calorimetry, 92(3), pp. 893-897.
The reaction of magnesium minerals such as brucite with CO2 is important in the sequestration of CO2. The study of the thermal stability of hydromagnesite and diagenetically related compounds is of fundamental importance to this sequestration. 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. This work makes a comparison of the dynamic and controlled rate thermal analysis of hydromagnesite and nesquehonite. The dynamic thermal analysis of synthetic hydromagnesite proves that dehydration and dehydroxylation take place in two steps at 135 and 184 degrees Celsius, and decarbonation at 412 degrees Celsius and 474 degrees Celsius. Controlled rate thermal analysis shows the first dehydration step is isothermal and the second quasi-isothermal at 108 and 145 degrees Celsius, respectively. The carbon dioxide is evolved in an isothermal decomposition at 370 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.
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|Item Type:||Journal Article|
|Keywords:||hydromagnesite, lansfordite, nesquehonite, magnesite, thermal analysis, CRTA, thermogravimetry|
|Subjects:||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)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Solid State Chemistry (030206)
|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:||08 May 2008|
|Last Modified:||29 Feb 2012 23:49|
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