|About this Abstract
||Materials Science & Technology 2020
||Synthesis, Characterization, Modeling and Applications of Functional Porous Materials
||Designing Multi-phase Reaction Pathways for CO2 Capture and Enhanced H2 Production from Ca- and Mg-bearing Precursors to Produce Stable Porous Carbonates Using Cross-scale X-ray Scattering Measurements
||Greeshma Gadikota, Tianhe Yin, Xun Gao, Ivan Kuzmenko
|On-Site Speaker (Planned)
Rising concentrations of atmospheric CO2 and the need for clean energy carriers motivate the directed synthesis of H2. One approach to separate CO2 and enhance H2 production is by combining carbon mineralization with the water-gas-shift (WGS) reaction, in which CO and H2O (steam) react to produce CO2 and H2. Our objective is to develop a single process that combines the separation of CO2 to produce Ca- and Mg-carbonates, while enhancing H2 production. We investigate the influence of nano- and micron-scale oxides and silicates of Ca and Mg on the capture and conversion of CO2 to produce Ca- and Mg-carbonates. At experimental conditions that correspond to the WGS reaction which are 200 oC and pCO2 of 20 atm, near complete conversion of Ca- and Mg-silicates to their respective carbonates is noted. We use in-operando synchrotron cross-scale X-Ray scattering measurements to develop mechanistic insights into the transformations of porous silicates to carbonates.