A Microporous Organic Copolymer for Selective CO₂ Capture under Humid Conditions
2019
Abdelnaby, Mahmoud M. | Qasem, Naef A. A. | Al-Maythalony, Bassem A. | Cordova, Kyle E. | Al Hamouz, Othman Charles S.
A cross-linked microporous organic copolymer, termed KFUPM-2, was synthesized through a Friedel–Crafts alkylation polymerization of phenothiazine, pyrrole, and p-formaldehyde in the presence of iron(III) chloride catalyst. KFUPM-2 was demonstrated to have intrinsic permanent microporosity with a Brunauer–Emmett–Teller surface area of 352 m² g–¹ and a high capacity (39.1 cm³ g–¹ at 273 K and 760 Torr) and affinity (Qₛₜ = 34 kJ mol–¹ and CO₂/N₂ selectivity of 51) toward CO₂ as a result of its nitrogen-rich structure. To demonstrate its practical applicability, breakthrough measurements were performed using a gas mixture that mimicked the composition of an industrial flue gas stream (CO₂/N₂ = 20/80% v/v with 91% relative humidity). Accordingly, KFUPM-2 was shown to have an ultrahigh CO₂ dynamic capacity (32 cm³ g–¹ at 298 K) in the presence of water and was demonstrated recyclable over at least 10 cycles with mild regeneration conditions needed between each cycle.
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