The study of CO2 absorption intensification using porous media material in aqueous AMP solution

In this work, the performance of CO 2 absorption into aqueous 2-amino-2-methyl-propanol (AMP) solution was investigated by measuring the amount of CO 2 in the liquid phase during CO 2 absorption process to identify initial CO 2 absorption rate. Then, the porous media material named as MCM41 was introduced into the amine solution to test its influence on CO 2 absorption. It was found that MCM41 increased initial CO 2 absorption rate and enhanced CO 2 absorption process. The physico-chemical properties of MCM41 were characterized in terms of specific surface area, average pore diameter, total pore volume and chemical properties, the amount of acidic sites and the Brϕnsted/Lewis (B/L) acid sites ratio. Results showed that MCM41 was a type of Lewis acid catalyst with large specific surface area and pore volume. In addition, the pKa of AMP solution with and without MCM41 was obtained using acid titration technology to help understand the effect brought by MCM41. A mechanism illustrating how MCM41 increases the CO 2 absorption rate of the AMP solution was proposed and demonstrated that MCM41 is a potential material for enhancing CO 2 absorption.