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Abstract

Summary

CO2 uptake behavior of smectitic clays is less predictable compared to other geomaterials as molecules (especially H2O) and ions sorb in the interplayer space leading to a volumetric expansion. In the context of geologic sequestration of carbon dioxide, it is important to understand how this multi-component system reacts upon exposer of supercritical CO2. In this study, we performed high-pressure CO2 adsorption experiments on expandable clays (Na+ and Ca2+ exchanged SWy-2 Montmorillonite) at relevant conditions for CO2 sequestration. With increasing hydration from dry (0W) state to one-layer hydrate (1W) the CO2 excess sorption capacity sharply increases and then decreases again with hydration to two-layer hydrate (2W). The magnitude of this effect is strongly controlled by the interplayer cation type (Ca2+, Na+). We interpret that this behavior is closely linked to the structure and swelling behavior of these clays by CO2 adsorption. Dry montmorillonite hardly expands when exposed to CO2 whereas a strong shift in the mean basal spacing d001 between the hydrated clay layers upon exposure to CO2 is observed around the sub1W hydration state. This indicates that high-pressure CO2 adsorption in the presence of water is strongly influenced by the intercalation of CO2 into the expandable interplayers.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201900330
2019-04-28
2024-04-20

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900330
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Hydration State and Interlayer Cation Type (Ca2+, Na+) Control CO2 Sorption Behavior of SWy-2 Montmorillonite
Conference Proceedings 2019, 1 (2019); https://doi.org/10.3997/2214-4609.201900330
/content/papers/10.3997/2214-4609.201900330
/content/papers/10.3997/2214-4609.201900330
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