A New Class of Single‐Component Absorbents for Reversible Carbon Dioxide Capture under Mild Conditions

摘要: Some inexpensive and commercially available secondary amines reversibly react with CO2 at room temperature ambient pressure to yield carbonated species in the liquid phase absence of any additional solvent. These solvent-free absorbents have a high capture capacity (0.63-0.65 mol /mol amine) 1.0 bar (=100 kPa), combined low-temperature reversibility pressure. (13) C NMR spectroscopy analysis identified as carbamate salts unexpected carbamic acids. were used for (15 40 % air) continuous cycles absorption-desorption carried out packed columns, yielding an absorption efficiency up 98.5 % temperatures 40-45 °C desorption 70-85 °C The parasitic solvent that requires be heated stability towards moisture heating could result some these being viable alternative aqueous chemical capture.