Enhancing process kinetics for mineral carbon sequestration
Open accessAbstract
The current low-cost process for mineral carbonation involves the direct carbonation of a slurry of magnesium or calcium silicate mineral with supercritical CO2. The process is currently limited by the slow reaction kinetics of the carbonation reactions, and in particular the slow dissolution rates of the silicates in weakly acidic conditions. Enhancing the dissolution rate in weakly acidic conditions has been identified as one of the main opportunities for lowering the costs of a direct mineral carbonation process. Serpentine has been identified by its reactivity and abundance as a potential mineral for use in a mineral carbonation process. In this paper we discuss the results of dissolution experiments in which ground serpentine was reacted in weakly acidic aqueous systems containing NH4Cl, NaCl,, sodium citrate, sodium EDTA, sodium oxalate, and sodium acetate. All experiments are carried out at 120 ∘C and under 20 bars of CO2 in a batch autoclave. It was found that the sodium salts of citrate, oxalate, and EDTA significantly enhance the dissolution of serpentine under weakly acidic conditions.
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Organic acids and their anions may affect mineral weathering rates by changing the dissolution rate far from equilibrium, making aqueous complexes with aqueous metals that would otherwise inhibit rates, and changing ion speciation in solution.
“Organic acids and their anions may affect mineral weathering rates by three possible mechanisms: (1) changing the dissolution rate far from equilibrium either decreasing solution pH or forming complexes with cations at the mineral surface, which provides a new parallel reaction mechanism for the detachment of material from the mineral surface; (2) ability to make aqueous complexes with aqueous”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [103]
The pH effect can be explained by sorption of protons on an oxide surface polarizing the metal-oxygen bonds, weakening the bonding with the underlying lattice.
“The pH effect can be explained by the fact that sorption of protons on an oxide surface polarizes the metal-oxygen bonds, weakening the bonding with the underlying lattice.103”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [103]
Far from equilibrium, the dissolution rates of most silicate minerals increase exponentially with increasing hydrogen ion concentration (low pH) in solution.
“Far from equilibrium, the dissolution rates of most silicate minerals increase exponentially with increasing hydrogen ion concentration (low pH) in solution.”
From A review of mineral carbonation technologies to sequester CO <sub>2</sub> (2014) · cites this paper as [103]
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A review of mineral carbonation technologies to sequester CO <sub>2</sub>
Sanna, A., Uibu, M., Caramanna, G., Kuusik, R., & Maroto-Valer, M. M. (2014) · Chem. Soc. Rev. · doi:10.1039/c4cs00035h · Cited by 1,194 · see citing works
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- Authors
- Krevor, S. C., & Lackner, K. S.
- Affiliations
- Columbia University (US)
- Corresponding author
- Krevor, Samuel C.
- Venue
- Energy Procedia
- Publisher
- Elsevier BV
- Published
- 2009-02
- Volume
- 1
- Issue
- 1
- Pages
- 4867-4871
- ISSN
- 1876-6102 (ISSN-L)
- OpenAlex
- W2067550424
- Cited by
- 94
- References
- 2
- Citations by year
- 2026: 6 · 2025: 11 · 2024: 3 · 2023: 5 · 2022: 4 · 2021: 2 · 2020: 4 · 2019: 4 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 6 · 2014: 9 · 2013: 8 · 2012: 11
- FWCI
- 16.34
- Type
- conference paper
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- Energy Procedia (publishedVersion, cc-by-nc-nd)
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Chemical Engineering › Process Chemistry and Technology › Carbon dioxide utilization in catalysis
- Keywords
- CO2 mineralization, serpentine, silicate dissolution, dissolution kinetics, supercritical carbon dioxide, chelating agents, sodium citrate, sodium EDTA, sodium oxalate, sodium acetate, magnesium silicate minerals, calcium silicate minerals, CO2 sequestration
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