NDLI: Supercritical CO<sub>2</sub>–brine induced dissolution, swelling, and secondary mineral formation on phlogopite surfaces at 75

Content Provider	Royal Society of Chemistry (RSC)
Author	Hu, Yandi Jun, Young-Shin Ray, Jessica R. Shao, Hongbo Garcia, Daniel J.
Copyright Year	2012
Abstract	To safely implement geologic carbon sequestration (GCS), a better understanding of geochemical reactions at supercritical CO2 (scCO2)–brine–clay mineral interfaces is necessary. This work investigated phlogopite dissolution and secondary mineral formation after freshly cleaved (001) surfaces were exposed to scCO2–brine systems. Phlogopite was used as a model clay mineral, and scCO2–1 M NaCl–phlogopite systems at 75 °C and 75 atm were chosen to mimic CO2 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 (μm3/μm2) was 0.34 ± 0.74 for illite and 0.05 ± 0.90 for amorphous silica nanoparticles.
Starting Page	5758
Ending Page	5767
Page Count	10
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	5
Issue Number	2
Journal	Energy & Environmental Science
DOI	10.1039/c2ee02026b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Carbon sequestration Supercritical fluid Mineral Phlogopite Brine Clay minerals Activation energy Silicon dioxide
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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