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High CO 2 ‐Capture Ability of a Porous Organic Polymer Bifunctionalized with Carboxy and Triazole Groups
Author(s) -
Xie LinHua,
Suh Myunghyun Paik
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201301822
Subject(s) - adsorption , sorption , polymer , selectivity , chemistry , materials science , chemical engineering , nuclear chemistry , organic chemistry , catalysis , engineering
A new porous organic polymer, SNU‐C1 , incorporating two different CO 2 ‐attracting groups, namely, carboxy and triazole groups, has been synthesized. By activating SNU‐C1 with two different methods, vacuum drying and supercritical‐CO 2 treatment, the guest‐free phases, SNU‐C1‐va and SNU‐C1‐sca , respectively, were obtained. Brunauer–Emmett–Teller (BET) surface areas of SNU‐C1‐va and SNU‐C1‐sca are 595 and 830 m 2 g −1 , respectively, as estimated by the N 2 ‐adsorption isotherms at 77 K. At 298 K and 1 atm, SNU‐C1‐va and SNU‐C1‐sca show high CO 2 uptakes, 2.31 mmol g −1 and 3.14 mmol g −1 , respectively, the high level being due to the presence of abundant polar groups (carboxy and triazole) exposed on the pore surfaces. Five separation parameters for flue gas and landfill gas in vacuum‐swing adsorption were calculated from single‐component gas‐sorption isotherms by using the ideal adsorbed solution theory (IAST). The data reveal excellent CO 2 ‐separation abilities of SNU‐C1‐va and SNU‐C1‐sca , namely high CO 2 ‐uptake capacity, high selectivity, and high regenerability. The gas‐cycling experiments for the materials and the water‐treated samples, experiments that involved treating the samples with a CO 2 ‐N 2 gas mixture (15:85, v / v ) followed by a pure N 2 purge, further verified the high regenerability and water stability. The results suggest that these materials have great potential applications in CO 2 separation.