To safely implement geologic carbon sequestration (GCS), a better understanding of geochemical reactions at supercritical CO 2 (scCO 2)-brine-clay mineral interfaces is necessary. This work investigated phlogopite dissolution and secondary mineral formation after freshly cleaved (001) surfaces were exposed to scCO 2-brine systems. Phlogopite was used as a model clay mineral, and scCO 2-1 M NaCl-phlogopite systems at 75 °C and 75 atm were chosen to mimic CO 2 storage conditions in deep saline aquifers. Additional experiments were also performed at 95 °C to explore the effect of temperature on phlogopite dissolution. The dissolution activation energies for each element were calculated to be 64.2 kJ mol -1 for Si, 53.6 kJ mol -1 for Mg, and 78.4 kJ mol -1 for Al. Over 43 h of reaction time, the activation energy for K dissolution was calculated to be 35.9 kJ mol -1. A whole-mineral activation energy for phlogopite, 62.5 kJ mol -1, was estimated from the weighted mean values of the activation energies of the framework elements (Al, Si, and Mg). Swelling of the phlogopite outer layers, dissolution pit formation, and precipitation of both illite and amorphous silica were dominant at both temperatures. At 75 °C, normalized volumetric surface coverage (μm 3/μm 2) was 0.34 ± 0.74 for illite and 0.05 ± 0.90 for amorphous silica nanoparticles.
ASJC Scopus subject areas
- Environmental Chemistry
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering