In this study, four different metal/non-metal oxide nanoparticles including CuO, Fe3O4, ZnO, and SiO2 were employed to improve CO2 absorption and desorption in methyl diethanolamine (MDEA)-based nanofluid. CO2 absorption experiment with various nanofluids was done in a bubble column reactor at ambient temperature. Also, CO2 stripping experiments for all nanofluids were done at 60 and 70 °C. The influence of nanoparticles type, nanoparticle concentration, and the stability of nanoparticles were studied on both CO2 absorption and stripping. The obtained results revealed that Fe3O4 nanoparticles at 0.01 wt.% concentration had the best influence on CO2 absorption and it improved the CO2 loading up to 36%. Also, CO2 stripping experiments for all nanofluids were done at 60 and 70 °C. The desorption experiments illustrated that metal oxide nanoparticles can be more efficient in improving CO2 desorption. In CO2 desorption, the CuO nanoparticles at 0.05 wt.% had higher efficiency, and enhanced CO2 concentration at outlet gas phase up to 44.2 vol.% at 70 °C. Finally, as an indication, the chemical stability of Fe3O4 NPs under optimum operational conditions was studied using XRD analysis and the result showed that the proposed operational condition did not have any negative effect on the chemical nature of Fe3O4 NPs.
Keywords: Bubble column; CO2 capture; Gas stripping; Nanofluid; Nanoparticles; Solvent regeneration.
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.