CO2 bubble absorption performance enhancement by TiO2 nanoparticles in MDEA solution

In order to enhance the absorption of CO2 in the N-methyldiethanolamine (MDEA) solution, stable nanofluids (the mass fraction of MDEA is 50% and the mass fraction of TiO2 nanoparticles are 0.05%, 0.2%, 0.4% and 0.8%) without any dispersant were prepared. The influence of nanoparticles mass fraction on CO2bubble absorption in the MDEA solution was studied. The amount of CO2 absorbed by the solution was measured by the weighing method, and the relative errors of the experiment results were analyzed. The experimental results show that the absorption of CO2 in the MDEA solution is enhanced by the addition of TiO2 nanoparticles and the effective absorption ratio increases with the increase of TiO2 nanoparticles mass fraction. The results show that the effective absorption ratio can reach 1.019 5, 1.065 3, 1.077 9 and 1.115 4 when the mass fraction of TiO2 nanoparticles are 0.05%, 0.2%, 0.4% and 0.8%, respectively. The possible mechanisms of the results and phenomena in the experiments are also explained.