Electrochemically-mediated amine regeneration (EMAR) is a new CO2 capture technology with the potential to exploit the excellent removal eï¬ƒciencies of thermal amine scrubbers while reducing parasitic energy losses and capital costs. Copper ions as an important intermediate active substance, itâ€™s electrochemical characteristics in EMAR system have a great influence on the efficiency of the system. In this study, a systematic study was carried out on the electrochemical characteristics of copper ions in the EMAR system. Anionic NO3- and SO42+ are identified more suitable for this system than Cl-. The reduction performance of copper ions will decrease, when the Cu(â…¡) complex is formed with MEA. However, after CO2 absorption, part of MEA in the solution will react with CO2 to form carbamate, and the reduction performance of the Cu(â…¡) complex will also be improved. For the cycling performance, a low current density is beneficial to improve the circulation performance of copper ions. The minimum regeneration energy consumption of the EMAR system obtained in the experiment is only 51.26 KJ/mol CO2, which is extremely competitive compared with thermal scrubbing CO2 capture process.
Keywords CO2 capture, EMAR, copper ions, electrochemical characteristics