Stabilization of nesquehonite for application in carbon capture utilization and storage
Ilango, Nirrupama Kamala; Nguyen, Hoang; Alzeer, Mohammad; Winnefeld, Frank; Kinnunen, Paivo (2024-12-05)
Royal society of chemistry
05.12.2024
Kamala Ilango, N., Nguyen, H., Alzeer, M., Winnefeld, F., & Kinnunen, P. (2025). Stabilization of nesquehonite for application in carbon capture utilization and storage. Materials Advances, 6(2), 552–556. https://doi.org/10.1039/D4MA00947A.
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© 2024 The Author(s). Published by the Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution Attribution 3.0 Unported Licence.
https://creativecommons.org/licenses/by/3.0/
© 2024 The Author(s). Published by the Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution Attribution 3.0 Unported Licence.
https://creativecommons.org/licenses/by/3.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202501071070
https://urn.fi/URN:NBN:fi:oulu-202501071070
Tiivistelmä
Abstract
Nesquehonite (MgCO3·3H2O) is of interest as a carbon sink for mineral carbonation as its formation is kinetically favored at ambient temperatures and pressures and offers the highest CO2 : MgO ratio compared to most other hydrated magnesium carbonates (HMCs). However, the phase tends to convert to more stable HMCs depending on the environment and time leading to long-term instability. Here, we report a successful attempt to stabilize nesquehonite using a phosphate-based pH 7 buffer, while controlling the equilibrium of aqueous carbonate species did not stabilize the phase. Phosphate interacts with nesquehonite to form a Mg-phosphate phase on nesquehonite's surface. We suggest that a protective layer is formed, which prevents further transformation of nesquehonite.
Nesquehonite (MgCO3·3H2O) is of interest as a carbon sink for mineral carbonation as its formation is kinetically favored at ambient temperatures and pressures and offers the highest CO2 : MgO ratio compared to most other hydrated magnesium carbonates (HMCs). However, the phase tends to convert to more stable HMCs depending on the environment and time leading to long-term instability. Here, we report a successful attempt to stabilize nesquehonite using a phosphate-based pH 7 buffer, while controlling the equilibrium of aqueous carbonate species did not stabilize the phase. Phosphate interacts with nesquehonite to form a Mg-phosphate phase on nesquehonite's surface. We suggest that a protective layer is formed, which prevents further transformation of nesquehonite.
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