Co2 absorption/desorption enhanced by nanoparticles in post-combustion co2 capture

Abstract

Absorption and desorption with faster kinetics are capable of reducing the size of absorber and stripper, and hence reducing the total cost of CO2 removal. In this work, we introduced nanoparticles to enhance the CO2 absorption and desorption with aqueous amine solutions. It is verified that particle Brownian movement and convective motion induced by Brownian movement contribute to the increase in liquid-side mass transfer coefficient. We investigated the effects of nanoparticles on three different kinds of solutions (30 % MEA, 30 % MDEA, and 1.5 mol/L PZ) and find that the corresponding influence of nanoparticles is quite different. We attribute the differences to the viscosities of solutions, which are likely to have significant influence on CO2 diffusion. Furthermore, we investigated the effects of SiO2,Al2O3, TiO2, CuO nanoparticles on the enhancement of the solvent regeneration. Solvent with TiO2 shows the highest desorption ability, following by CuO, SiO2, and Al2O3.