Supercritical CO2 (scCO2) stored in deep geological formations is expected to remain for hundreds of years and mineral transformation, particularly carbonation reactions, will occur in the process.  Currently, there is little knowledge about the chemical reactions involved.  In this work, we have developed a modular in situ optical spectroscopic platform that integrates a scCO2 generation and manipulation system with optical spectroscopy techniques including UV-visible, IR, Raman and laser fluorescence spectroscopy.  With the system, we have studied the dissolution of H2O/D2O and forsterite transformation in scCO2 under variable pressure, temperature and water content.  Our results indicated that IR spectra of H2O/D2O in the range from 700 cm-1 to ~ 2900 cm-1 can be used for their in situ qualitative and quantitative analysis.  Systematic variations of several vibrational frequencies were also observed during the course of forsterite interaction with scCO2 in the presence of D2O over a period of 24 hours.

Investigation of forsterite transformation in supercritical CO<sub>2</sub> by in-situ optical spectroscopy

239th National Meeting (2010)

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Investigation of forsterite transformation in supercritical CO2 by in-situ optical spectroscopy

Investigation of forsterite transformation in supercritical CO₂ by in-situ optical spectroscopy