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Interaction of Carbon Dioxide with Na-exchanged Montmorillonite at Pressures to 640 Bars: Implications for CO2 Sequestration

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posted on 02.10.2012, 00:00 authored by Paul Giesting, Stephen Guggenheim, August F. Koster van Groos, Andreas Busch
Na-exchanged montmorillonite swells upon interacting with CO2 under the conditions P(CO2) ≤ 50 bars, T = 22-47°C, as shown by experiments in high-pressure environmental chambers using powder X-ray diffraction techniques. The amount of swelling depends on the initial H2O content of the montmorillonite. Maximum expansion, to 12.3 Å, occurred in a sample with an initial d(001) of 11.3 Å at P(CO2) = 57 bars. Thus, montmorillonite can expand by 9% in contact with CO2 where small amounts of H2O are present in the interlayer. Little to no expansion occurs for samples with an initial d(001) ≤ 10.0 Å or d(001) = 12.3 to 12.5 Å. The reaction with CO2 is complete by ~50 bars; increasing P(CO2) from 50 to 640 bars did not result in any significant further increase of d(001). This work shows that a smectite-rich cap rock above a carbon sequestration reservoir may be significantly altered by reacting with CO2.


This project was supported by Shell Exploration and Production, B.V. and NSF grant EAR #0929312.


Publisher Statement

NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Greenhouse Gas Control. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Greenhouse Gas Control, [Vol 8, 2012 May] DOI:10.1016/j.ijggc.2012.01.011







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