CO(2) Capture With Absorbents of Tertiary Amine Functionalized Nano–SiO(2)

To improve CO(2) adsorption performance of nanoparticle absorbents, a novel tertiary amine functionalized nano–SiO(2) (NS–NR(2)) was synthesized based on the 3–aminopropyltrimethoxysilane (KH540) modified nano–SiO(2) (NS–NH(2)) via methylation. The chemical structure and performances of the NS–NR(2) were characterized through a series of experiments, which revealed that NS–NR(2) can react with CO(2) in water and nanofluid with low viscosity revealed better CO(2) capture. The CO(2) capture mechanism of NS–NR(2) was studied by kinetic models. From the correlation coefficient, the pseudo second order model was found to fit well with the experiment data. The influencing factors were investigated, including temperature, dispersants, and cycling numbers. Results has shown the additional surfactant to greatly promote the CO(2) adsorption performance of NS–NR(2) because of the better dispersity of nanoparticles. This work proved that NS–NR(2) yields low viscosity, high capacity for CO(2) capture, and good regenerability in water. NS–NR(2) with high CO(2) capture will play a role in storing CO(2) to enhanced oil recovery in CO(2) flooding.