Cyclic adsorption–desorption performance testing of PEI-modified SCF materials

https://doi.org/10.1039/C8TA06224B

“The regenerability or cyclic adsorption–desorption performance of a CO₂ adsorbent is critical in determining their life-time importance in practical applications. Therefore, some of the best-performing PEI-600-modified SCF adsorbents are selected for cyclic performance testing under simulated flue gas conditions. As shown in Fig. 10, no appreciable changes in CO₂ uptake were observed from the 50 cycles of adsorption–desorption tests for different selected samples, highlighting the novel thermo-stability and fully reversible CO₂ adsorption of the adsorbents. The negligible losses observed in the first few cycles were believed to be mainly associated with the evaporation loss of small quantities of lower molecular mass PEI components present in the PEI. In addition, it seems that the SCF materials prepared at higher aging temperatures or longer aging times present considerably higher thermal stability, which is attributable to the presumably increased holding strength of the materials for the impregnated PEI due to their denser and thicker shells as shown in Fig. 3 and S1.†”

“Fig. 10 Cyclic adsorption–desorption profiles of PEI-600-modified SCF materials for CO₂ uptake under simulated flue gas conditions (15% CO₂ in N₂). Conditions: adsorption temperature: 75 °C; desorption temperature: 130 °C; heating rate: 15 °C min⁻¹.”