Li, Fuyue Stephanie Qiu, Wulin Lively, Ryan P. Lee, Jong Suk Rownaghi, Ali A. Koros, William J. 2024-01-20T12:03:25Z 2024-01-20T12:03:25Z 2021-08-31 2013-07 1864-5631 https://pubs.kist.re.kr/handle/201004/127943 Carbon dioxide emitted from existing coal-fired power plants is a major environmental concern due to possible links to global climate change. In this study, we expand upon previous work focused on aminosilane-functionalized polymeric hollow-fiber sorbents by introducing a new class of polyethyleneimine (PEI)-functionalized polymeric hollow-fiber sorbents for post-combustion carbon dioxide capture. Different molecular weight PEIs (M-n approximate to 600, 1800, 10000, and 60000) were studied as functional groups on polyamide imide (PAI, Torlon) hollow fibers. This imide ring-opening modification introduces two amide functional groups and was confirmed by FTIR attenuated total reflectance spectroscopy. The carbon dioxide equilibrium sorption capacities of PEI-functionalized Torlon materials were characterized by using both pressure decay and gravimetric sorption methods. For equivalent PEI concentrations, PAI functionalized with lower molecular weight PEI exhibited higher carbon dioxide capacities. The effect of water in the ring-opening reaction was also studied. Up to a critical value, water in the reaction mixture enhanced the degree of functionalization of PEI to Torlon and resulted in higher carbon dioxide uptake within the functionalized material. Above the critical value, roughly 15% w/w water, the fiber morphology was lost and the fiber was soluble in the solvent. PEI-functionalized (M-n approximate to 600) PAI under optimal reaction conditions was observed to have the highest CO2 uptake: 4.9g CO2 per 100g of polymer (1.1mmolg(-1)) at 0.1bar and 35 degrees C with dry 10% CO2/90% N-2 feed for thermogravimetric analysis. By using water-saturated feeds (10% CO2/90% N-2 dry basis), CO2 sorption was observed to increase to 6.0g CO2 per 100g of sorbent (1.4mmolg(-1)). This material also demonstrated stability in cyclic adsorption-desorption operations, even under wet conditions at which some highly effective sorbents tend to lose performance. Thus, PEI-functionalized PAI fibers can be considered as promising material for post-combustion CO2 capture. English WILEY-V C H VERLAG GMBH CARBON-DIOXIDE CAPTURE FLUE-GAS REACTION-KINETICS SWING ADSORPTION ACTIVATED CARBON CROSS-LINKING MEMBRANES ADSORBENTS SEPARATION NANOFILTRATION Polyethyleneimine-Functionalized Polyamide Imide (Torlon) Hollow-Fiber Sorbents for Post-Combustion CO2 Capture Article 10.1002/cssc.201300172 1 CHEMSUSCHEM, v.6, no.7, pp.1216 - 1223 CHEMSUSCHEM 6 7 1216 1223 scie scopus 000321309600020 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Chemistry Science & Technology - Other Topics Article CARBON-DIOXIDE CAPTURE FLUE-GAS REACTION-KINETICS SWING ADSORPTION ACTIVATED CARBON CROSS-LINKING MEMBRANES ADSORBENTS SEPARATION NANOFILTRATION amines carbon dioxide capture environmental chemistry mesoporous materials polymers