Experimental study of CO2 capture by nanoparticle-enhanced 2-amino-2-methyl-1-propanol aqueous solution

Abstract

2-Amino-2-methyl-1-propanol (AMP) is often used as a moderator to enhance the CO₂ capture capacity of absorbents due to its unique spatial site resistance structure, and relatively few studies have been conducted on the enhancement of AMP aqueous solutions by nanoparticles for CO₂ capture. In order to investigate the effect of nanoparticles on the CO₂ capture performance of AMP aqueous solution, different nanofluids were formulated in this paper using a two-step method, and a bubbling reactor and an oil bath were used as the experimental setup for absorption/desorption, and through comparative experiments, it was found that the type of nanoparticles, the solid content, and the different parameters have great influences on the CO₂ absorption load and desorption rate. The experimental results show that the addition of TiO₂ nanoparticles to the AMP base solution can accelerate the absorption–desorption mass transfer rate of CO₂, and there exists an optimal solid content of 1 g L⁻¹ (±1.0%, ±2.5%); after multiple absorption–desorption experiments, good cycling performance can still be achieved. The experimental results of the nanofluid-promoted mass transfer mechanism are also illustrated and analyzed in this paper.