Assessing the Stability of Amine-Based Hollow Fiber Sorbents to Flue Gas Impurities in Post-Combustion CO2 Capture

For amine-based hollow fiber sorbents to be useful in practical CO₂ capture applications, it is crucial to exhibit a stable performance and a long lifetime in the presence of flue gas impurities. In our earlier investigation,¹ we studied the stability of supported amine sorbents to SO_x and NO_x gas impurities.  Here, as a next step, the stability of amine-containing polymer/silica hollow fiber sorbents to SO₂, NO and NO₂ impurities during CO₂ capture is evaluated by conducting cyclic adsorption – desorption experiments in a rapid temperature swing adsorption process. Fiber sorbents containing primary, secondary, and tertiary amine moieties are exposed to different gas mixtures, comprising SO₂/CO₂, NO/CO₂ and NO₂/CO₂ using different SO_x and NO_x concentrations. Furthermore, to assess any synergies in co-adsorption of SO_x or NO_x and CO₂ gases, multi-component adsorption measurements are carried out using a mixture of SO₂/NO/CO₂, in addition to the binary-component adsorption measurements listed above. The dynamic cyclic CO₂ capacities of the hollow fiber sorbents are measured accordingly to evaluate any capacity loss over120 cycles due to irreversible binding of SO₂, NO or NO₂ to the amine sites.

Reference

(1)      Rezaei, F.; Jones, C. W. Ind. Eng. Chem. Res. 2013, 52, 12192.