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Investigation of High-Temperature CO2 Capture by CaO in CaCl2 Molten Salt

Modifications of CaO-based sorbents with various inorganic salts to overcome the degradation in the reactivity between the active material and CO2 in a carbon capture process have previously been evaluated. The present paper focuses on the performance of a novel CO2 capture technology, where CaCl2 is applied as the solvent for the dissolution/dispersion of CaO and CaCO3. CO2 capture by CaO was carried out with carbonation temperatures in the range of 770–830 °C by bubbling simulated flue gas through the melt, using a fully automated flow-through atmospheric pressure reactor. Subsequently, decomposition of the formed CaCO3 to CaO and CO2 was conducted at 910–950 °C using pure N2. Online gas analysis was performed using a Fourier transform infrared (FTIR) gas detector and gravimetric analysis. The results indicate that the CaO carbonation efficiency decreases at temperatures higher than 800 °C. Increasing the concentration of CaO enhances the carbonation reaction. The amount of CO2 uptake for 15 wt % CaO in...

Authors:   Viktorija Tomkute; Asbjørn Solheim; Espen Olsen
Journal:   Energy & Fuels
Year:   2013
DOI:   10.1021/ef4009899
Publication date:   28-Aug-2013
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