Enhanced CO<sub>2</sub> Capture-Desorption by Surface-Active Amine
ABDULMUIZ ADEKOMI, Omar A. Carrasco-Jaim, Upali Weerasooriya, Ryosuke Okuno
Abstract
Developing an efficient solvent for carbon dioxide (CO 2 ) capture stands as a pivotal step in mitigating greenhouse gas emissions and long-term climate change. In this study, we evaluated the CO 2 capture-desorption performance of 3-(dimethylamino)propylamine-6-propylene oxide (DMAPA-6PO), as a surface-active tertiary amine for cyclic CO 2 capture as bicarbonate. Results delineate a distinct CO 2 capture pathway utilizing DMAPA-6PO, which not only promotes bicarbonate generation, but also enhances CO 2 solubilization. This enhancement is attributed to the surface activity, based on 13 C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR) analyses. Furthermore, DMAPA-6PO demonstrated a stable cyclic capacity, maintaining the CO 2 capture performance and bicarbonate concentration profiles over 900 min of testing cycles. We also examined the CO 2 capture capacity regeneration efficiency and desorption heat requirement in comparison with those of common commercial solvents. DMAPA-6PO showed a capture capacity regeneration efficiency that was 30% higher than that of monoethanolamine (MEA). Additionally, it exhibited a superior desorption rate, resulting in a substantial reduction of 88% in the heat duty requirements compared to MEA. The results demonstrate that DMAPA-6PO is a promising surface-active tertiary amine for capturing CO 2, offering significant advantages in both the CO 2 -capture- as -bicarbonate pathway and traditional amine-based thermal desorption process.