Highly Selective CO2 Capture by Triazine-Based Benzimidazole-Linked Polymers
2014
Sekizkardes, Ali Kemal | Altarawneh, Suha | Kahveci, Zafer | İslamoğlu, Timur | El-Kaderi, Hani M.
Triazine-based benzimidazole-linked polymers (TBILPs), TBILP-1 and TBILP-2, were synthesized by condensation reaction of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine (TFPT) with 1,2,4,5-benzenetetraamine tetrachloride (BTA) and 2,3,6,7,14,15-hexaaminotriptycene (HATT), respectively. The Ar sorption isotherms at 87 K revealed high surface areas for TBILP-1 (330 m² g–¹) and TBILP-2 (1080 m² g–¹). TBILP-2 adsorbed significantly high CO₂ (5.19 mmol g–¹/228 mg g–¹) at 1 bar and 273 K. Initial slope selectivity calculations demonstrated that TBILP-1 has very high selectivity for CO₂ over N₂ (63) at 298 K, outperforming all triazine-based porous organic polymers reported to date. On the other hand, the larger surface area of TBILP-2 leads to relatively lower selectivity for CO₂/N₂ (40) and CO₂/CH₄ (7) at 298 K. TBILPs showed moderate isosteric heats of adsorption for CO₂: TBILP-1 (35 kJ mol–¹) and TBILP-2 (29 kJ mol–¹) enabling high and reversible CO₂ uptake at ambient temperature. In addition, TBILPs displayed promising working capacity, regenerability, and sorbent selection parameter values for CO₂ capture from gas mixtures under vacuum swing adsorption (VSA) and pressure swing adsorption (PSA) conditions.
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