Experimental Study on Enhancement of Bubble Absorption of Gaseous CO 2 with Nanofluids in Ammonia

In order to study the effects of nanoparticles on the CO 2 absorption in ammonia, nanofluids with different ammonia concentration and different nanoparticle solid loading were prepared by a two-step method. The nanofluids-enhanced gas absorption test devices were also established. The CO 2 absorption in TiO 2 , CuO, SiO 2 nanofluids, which nanoparticles solid loading were 1.0-8.0 g/L, was tested respectively. In comparison with the blank absorption experiment, the effects of nanoparticle solid loading, nanoparticle types, ammonia concentration on the removal efficiency and removal rate were obtained. Experimental results show that adding nanoparticles can enhance the removal efficiency and removal rate, which increase first and then decrease with the increase of nanoparticle solid loading, and there exists an optimum solid loading of TiO 2 nanoparticles. The effect of SiO 2 nanofluid is inhibitory on the reaction. The enhancement factor of CuO nanofluid is always hovering around 1, which does not show the obvious enhancement or inhibition on the reaction. The optimum solid loading decreases gradually with the increase of ammonia concentration. In addition, according to the experimental results, the mechanism of enhanced absorption was analyzed theoretically.