The development of energy-effi cient absorbents for post-combustion CO₂ capture is essential for carbon neutrality. 

Conventional amines such as monoethanolamine (MEA) show high CO₂ reactivity but suff er from high regeneration 

energy due to stable carbamate formation. In this study, we evaluated 2,2´-(ethylenedioxy) bis(ethylamine) (EDBEA), an 

ether-containing diamine, and compared its absorption performance with MEA, 3-(methylamino)propylamine (MAPA), 

2-amino-2-methyl-1-propanol (AMP), and digylcolamine (DGA). Bubble-cell experiments revealed that EDBEA exhibited 

slightly lower CO₂ absorption capacity than MAPA, but a higher cyclic capacity, indicating enhanced regenerability. 13 C 

NMR and relative Gibbs free energy calculations confi rmed that the carbamate formed by EDBEA was less stable than 

those of MEA and MAPA. Density functional theory (DFT) analyses showed that the ether group in EDBEA reduced 

electron density near nitrogen atom, weakened hydrogen bonding, and favored van der Waals interactions over extensive 

hydrogen-bond networks, thereby lowering the regeneration energy requirement. These results demonstrate that incorporating

an ether group eff ectively modulates the electronic environment of amines, leading to reduced carbamate stability 

and improved solvent regenerability.