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

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.