Amino Disiloxanes for CO₂ Capture

A series of aminodisiloxanes were synthesized with varying degrees of functionality and steric hindrance and screened as CO 2 -capture solvents. Compounds with unhindered primary amine groups were found to come closest to reaching their theoretical CO 2 uptake values. In contrast, materials containing either hindered primary amines or secondary amine functionality were less efficient. Addition of a cosolvent, triethylene glycol, was found in most cases to maintain solution liquidity and thereby minimize mass transfer limitations on exposure to CO 2 .