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| Titel |
Effect of iron cation on geochemical trapping of CO2 in brine |
| VerfasserIn |
Qi Liu, Mercedes Maroto-Valer |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086794
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| Publikation (Nr.) |
 EGU/EGU2014-721.pdf |
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| Zusammenfassung |
| Carbon dioxide sequestration using brines has emerged as a promising technology to mitigate
the adverse impacts of climate change due to its large storage capacity and favorable
chemistries. However, the permanent storage (mineral trapping) of CO2 in brines takes
significantly long periods of time as the formation and precipitation of carbonates
is very slow .[1]. The main parameters reported to effect on mineral trapping of
CO2 sequestration in brines are brine composition, brine pH, system temperature
and pressure.[2, 3]. It is suggested that the precipitation of mineral carbonates is
mostly dependent on brine pH. Previous studies by the authors concluded that iron in
natural brines causes pH instability, but it was not ascertained whether ferric iron or
ferrous iron caused pH instability .[4]. Accordingly, the aim of this project is to study
synthetic brines mimicking the major ions found in natural brines and including
different concentrations of ferric and ferrous iron. Three brines were prepared, as
follows: Brine 1 was prepared with ferric Fe3+ iron, Brine 2 prepared with ferrous
Fe2+ iron and Brine 3 prepared with no iron. A series of pH stability studies and
carbonation reactions were conducted using the above three brines. It is concluded that
the ferrous iron causes pH instability, while ferric iron might promote carbonate
precipitation.
.1. Garcia, S., et al., Sequestration of non-pure carbon dioxide streams in iron
oxyhydroxide-containing saline repositories. International Journal of Greenhouse Gas
Control, 2012. 7: p. 89-97.
2. Liu, Q. and M.M. Maroto-Valer, Investigation of the pH effect of a typical host rock and
buffer solution on CO< sub> 2 sequestration in synthetic brines. Fuel Processing
Technology, 2010. 91(10): p. 1321-1329.
3. Liu, Q. and M.M. MarotoValer, Parameters affecting mineral trapping of CO2
sequestration in brines. Greenhouse Gases: Science and Technology, 2011. 1(3): p.
211-222.
4. Druckenmiller, M.L. and M.M. Maroto-Valer, Carbon sequestration using brine of
adjusted pH to form mineral carbonates. Fuel Processing Technology, 2005. 86(14): p.
1599-1614. |
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