Supercritical CO 2-brine-clay mineral interactions and their implications for geologic CO 2 sequestration

Young Shin Jun, Hongbo Shao, Yandi Hu, Jessica R. Ray

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish (US)
JournalACS National Meeting Book of Abstracts
StatePublished - 2011
Externally publishedYes
Event242nd ACS National Meeting and Exposition - Denver, CO, United States
Duration: Aug 28 2011Sep 1 2011

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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