Highly selective CO2 capture by triazine-based benzimidazole-linked polymers

Ali Kemal Sekizkardes, Suha Altarawneh, Zafer Kahveci, Timur Islamoʇlu, Hani M. El-Kaderi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)8328-8334
Number of pages7
JournalMacromolecules
Volume47
Issue number23
DOIs
StatePublished - Dec 9 2014
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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