TY - JOUR
T1 - Supercritical CO 2-brine-clay mineral interactions and their implications for geologic CO 2 sequestration
AU - Jun, Young Shin
AU - Shao, Hongbo
AU - Hu, Yandi
AU - Ray, Jessica R.
PY - 2011
Y1 - 2011
N2 - Devising effective mitigation strategies for the anthropogenic CO 2 are imperative. Although geologic CO 2 sequestration (GCS) is promising, we still do not have a holistic understanding of potential reactions in GCS. In this study, we investigated the mechanisms, kinetics, and environmental impact of interfacial reactions among CO 2-water-clay mineral surfaces at nanoscale. By incorporating aqueous chemistry with high resolution transmission electron microscopy and atomic force microscopy, we monitored nanoscale morphological changes resulting from dissolution of pre-existing minerals and precipitation of new mineral phases. This research also investigated the effects of various environmental factors (such as salinity, temperature, pressure, and the extent of water) on the dissolution and surface morphological changes of clay minerals. Phlogopite [KMg 2.87Si 3.07Al 1.23O 10(F,OH) 2], biotite [K(Mg,Fe) 3AlSi 3O 10(OH,F) 2], and muscovite [KAl 2(Si 3Al)O 10(OH,F) 2] were used for model clay minerals in GCS sites. The experimental results suggest that monitoring the early stage of interfacial reactions is crucial to understanding the CO 2-water-rock interactions in GCS.
AB - Devising effective mitigation strategies for the anthropogenic CO 2 are imperative. Although geologic CO 2 sequestration (GCS) is promising, we still do not have a holistic understanding of potential reactions in GCS. In this study, we investigated the mechanisms, kinetics, and environmental impact of interfacial reactions among CO 2-water-clay mineral surfaces at nanoscale. By incorporating aqueous chemistry with high resolution transmission electron microscopy and atomic force microscopy, we monitored nanoscale morphological changes resulting from dissolution of pre-existing minerals and precipitation of new mineral phases. This research also investigated the effects of various environmental factors (such as salinity, temperature, pressure, and the extent of water) on the dissolution and surface morphological changes of clay minerals. Phlogopite [KMg 2.87Si 3.07Al 1.23O 10(F,OH) 2], biotite [K(Mg,Fe) 3AlSi 3O 10(OH,F) 2], and muscovite [KAl 2(Si 3Al)O 10(OH,F) 2] were used for model clay minerals in GCS sites. The experimental results suggest that monitoring the early stage of interfacial reactions is crucial to understanding the CO 2-water-rock interactions in GCS.
UR - https://www.scopus.com/pages/publications/84861086752
M3 - Conference article
AN - SCOPUS:84861086752
SN - 0065-7727
JO - ACS National Meeting Book of Abstracts
JF - ACS National Meeting Book of Abstracts
T2 - 242nd ACS National Meeting and Exposition
Y2 - 28 August 2011 through 1 September 2011
ER -