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AGU 2011 Poster Presentations

AGU 2011 Poster Presentations. Forsterite Carbonation in Wet scCO 2 In situ HXRD to moni to r mineral stability Impacts of dissolved water on carbonation Transition phases Water threshold Importance to Carbon Sequestration Caprock stability Mo deling long term impacts to minerals

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AGU 2011 Poster Presentations

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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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