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Investigating Carbonation of Forsterite and Wollastonite in Wet scCO2 for Carbon Sequestration

This research poster presents findings on the carbonation processes of forsterite (Mg2SiO4) and wollastonite (CaSiO3) in wet supercritical CO2 environments. Utilizing in situ high-energy X-ray diffraction (HXRD), we monitor mineral stability and transition phases influenced by dissolved water. Our results highlight the impact of water thresholds on carbonation rates, temperature dependencies, and the potential for developing green building materials. The implications for long-term mineral stability and caprock integrity are crucial for advancing effective carbon sequestration strategies and commercial applications.

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Investigating Carbonation of Forsterite and Wollastonite in Wet scCO2 for Carbon Sequestration

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  1. AGU 2011 Poster Presentations • Forsterite Carbonation in Wet scCO2 • In situ HXRD to monitor mineral stability • Impacts of dissolved water on carbonation • Transition phases • Water threshold • Importance to Carbon Sequestration • Caprock stability • Modeling long term impacts to minerals • Wollastonite Carbonation in H2O and Gaseous CO2 • In situ Low Pressure Mineralization • Calcite and aragonite • Variable carbonation rates depending on temperature and water • Commercial Application • Developing green building materials • Optimizing conditions

  2. Mineral Selection and Technique • Forsterite [Mg2SiO4] • Important basalt mineral • Major source Mg cations • Common to other CSI • Wollastonite [CaSiO3] • Fast reacting • High carbonation potential • Sequestration option Wollastonite Forsterite • Be sleeve • Transparent to x-rays (Co and Cu) • Pressure rating ~100-200 bar • Acid gas compatible • Temperature range (-100° to225°C) • Be inserts • Geometrically compatible to low angles • X-ray transmission capable • Corundum (α-Al2O3) standard • Base (PNNL) • Gas ports (two) • Sealing o-ring

  3. Forsterite [Mg2SiO4] Carbonation with Wet scCO2 (50°C) EXP #3, 67% 33% Unreacted Forsterite EXP #5, 1185% 1185% 67%

  4. Forsterite Carbonation with Wet scCO2 (75°C) • In situ HXRD Results • Hydromagnesite precursor [Mg5(CO3)4(OH)2·4H2O] • Complete conversion to magnesite • Large amorphous peak indicating amorphous silica • SEM characterization • Large clusters of magnesite • Well formed rhombohedrals 4

  5. Wollastonite [CaSiO3] Carbonation • In situ HXRD Experiments • Powdered samples (2 particle sizes) • Aragonite and/or Calcite • Controlling carbonation of wollastonite • Water content • Heating • Particle size 5

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