The encapsulation of viscous CO2 capture solvents such as nanoparticle organic hybrid materials (NOHMs) is a promising option to enhance their kinetically limited CO2 capture rate. By creating large gas-liquid interfacial areas with high gas permeability, the encapsulated solvents can benefit from characteristics of both solvent and solid sorbent technologies. In this study, a hybrid CO2 capture sorbent system has been designed for the NOHMs based on one of the reported encapsulation techniques: Solvent Impregnated Polymers (SIPs). The encapsulated liquid-like NOHMs sorbents have been prepared by immobilizing NOHMs as microemulsions inside a gas permeable polymer phase, which is subsequently UV cured. The CO2 capture behaviors of NOHMs-bearing SIPs are studied in both batch (TGA) and gas-solid dynamic (fixed bed) systems. The results show that the CO2 capture kinetics of NOHMs are significantly improved in the new hybrid sorbent system due to the high surface area of the NOHMs microemulsion phase. The CO2 permeability through the supporting polymer phase is found to be relatively fast but the particle size of NOHMS-based SIPs also influences the CO2 capture kinetics suggesting that for sorbent particles larger than 430 microns, the mass transfer would also play an important role. Also, the governing mechanism of CO2 capture using SIPs is investigated and is determined based on kinetic modeling. The experimental findings suggest that the encapsulation of NOHMs can allow flexible design of CO2 capture units ranging from a fixed bed to a fluidized bed as the sorbents can be treated as a particulate system.

Encapsulation of viscous liquid-like CO2 capture solvent for enhanced capture kinetics

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.