(479f) Adsorption of CO2 Over Supported Amine Adsorbents in the Presence of SOx and NOx Impurities

Rezaei, F., Georgia Institude of Technology
Jones, C. W., Georgia Institute of Technology

For supported amine adsorbents to be useful in practical CO2 capture application, it is crucial to exhibit a stable performance and a long lifetime in the presence of flue gas impurities such as SOx and NOx. Here, the stability of supported aminosilica adsorbents to SO2 and NOx impurities in CO2 capture process is evaluated by conducting equilibrium and dynamic adsorption experiments. The effect of temperature, feed concentration and adsorbent amine loading are investigated by performing the adsorption experiments in TGA and fixed bed using different SO2, NO and NO2 concentrations. In equilibrium measurements, the single-component adsorption of CO2, SO2, NO and NO2 onto supported amine adsorbents is carried out by directly exposing the material to the various gases in carrier gas. The CO2 capacity is measured before and after exposure to SO2, NO or NO2 to evaluate any CO2 capacity loss due to irreversible binding of SO2, NO or NO2 to the supported amine adsorbents. Furthermore, to assess any synergies in co-adsorption of SOx or NOx and CO2 gases, three gas mixtures comprising SO2/CO2, NO/CO2 and NO2/CO2 are used in addition to single-component adsorption measurements. The experiments are performed by simultaneously exposing the adsorbents to CO2 and SO2 or CO2 and NO/NO2 and thereby their CO2 uptake is measured at different temperatures.