https://doi.org/10.1016/j.apenergy.2016.09.081
“In order to avoid high energy penalty costs, apart from a high CO2 capture capacity and a fast adsorption-desorption kinetics, CO2 sorbents should be stable and regenerated at low temperature. In this section, the stability and cyclic behaviour of FS-DETA-10% and FS-DETA-40% were investigated via four consecutives CO2 adsorption-desorption cycles, during 850 min at 60 °C. The adsorption temperature was selected at 60 °C since it is the most common temperature used in chemical absorption processes using aqueous alkanolamines. The carbon capture stability during the 4 cycles can be observed in Fig. 11, and the calculated CO2 capture capacities during each cycle for FS-DETA-10% and FS-DETA-40% at 60 °C are shown in Fig. 12. The CO2 capture capacity remained substantially constant after four cycles, with a relatively insignificant drop of 0.36% between the first and the fourth cycle in the case of FS-DETA-10% (from 30.43 to 30.32 mg-CO2/g-ads). However, a drop of 4.9% in the CO2 capture capacity between the first and the fourth cycle was observed for FS-DETA-40% (from 28.92 to 27.51 mg-CO2/g-ads). The drop exhibited by FS-DETA-40% could be due to imperfect regeneration, or possibly leaching of DETA from the support material during the adsorption or regeneration processes. For comparison, a drop of 4% in the carbon capture capacity after 10 cycles was considered acceptable for MC-PEI-65% by Jitong and Wang [58], whereas a drop of 7% in the carbon capture capacity observed on 50-TEPA-TiO2-Based composite sorbents under 10% CO2/N2 at 75 °C was associated with the continuous volatilisation of the impregnated TEPA during the first 4 cycles [38].”
“Fig. 11. CO2 adsorption and regenerability of FS-DETA-10% and FS-DETA-40% at 60 °C. Adsorption step conditions: pure CO2 (60 mL/min). Regeneration by flushing pure N2 (60 mL/min).”
“Fig. 12. CO2 adsorption capacity of FS-DETA-10% and FS-DETA-40% respect to the number of cycles, at 60 °C and 1 bar.”