Functional molecular engineering hierarchical pore-interface based on thermodynamic-kinetic synergy strategy for efficient CO2 capture and separation

Adsorption of CO2 in Flue Gas by Polyethylenimine-Functionalized Adsorbents: Effects of the Support Morphology and Dispersion Mode of Amines

“…Various materials, including activated carbon, zeolites, MXenes, and metal–organic frameworks, have been widely explored due to their well-defined pore structures and high specific surface areas. − However, the temperature dependence of physical adsorption leads to a rapid decrease in the adsorption capacity of these materials for CO 2 at high temperatures, limiting their industrial applications due to adsorption selectivity constraints. , To overcome the limitations of pure physical adsorption, a strategic combination of physical adsorption and chemical adsorption has been developed to improve the adsorption capacity. For example, organic amines loaded into porous supports have been widely studied as solid amine adsorbents for CO 2 capture in recent years, by which a reversible chemisorption between CO 2 and the amine functional groups can be readily achieved. − Therefore, solid amine adsorbents exhibit excellent adsorption capacity, selectivity, and cycle ability and show good application potential in the field of postcombustion CO 2 capture. The synthesis of solid amine adsorbents can be classified into three categories: chemical grafting, simultaneous condensation, and wet impregnation. − While adsorbents prepared through chemical grafting and simultaneous condensation offer improved stability compared to those obtained through direct physical impregnation, the latter method requires less expensive chemical reagents for grafting, making it more cost-effective, enabling a higher loading capacity and easier preparation .…”