Rapid Screening of Immobilized Amine CO2 Sorbents for Steam Stability by Their Direct Contact with Liquid H2O

Rapid testing of hydrophilic and hydrophobic basic immobilized amine sorbents (BIAS) for CO2 capture stability under practical conditions was achieved by direct contact of the sorbents with flowing liquid water. Losses in both CO2 capture capacity and amine content of sorbents after exposure to 0.5 mL min−1 of H2O at 25 °C for 40 min followed similar trends as losses observed after exposure to N2/steam (105 °C, 7 % H2O) for 10 h. We also found that hydrophobic TMPED helped stabilize sorbents to H2O, which was confirmed by DRIFTS and combined TGA-DSC.