Thermal Stability Enhanced Tetraethylenepentamine/Silica Adsorbents for High Performance CO2 Capture

Sunghyun Park, Keunsu Choi, Hyun Jung Yu, Young June Won, Chaehoon Kim, Minkee Choi, So Hye Cho, Jung-hyun Lee, Seung Yong Lee, Jong Suk Lee

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15 Citations (Scopus)

Abstract

Tetraethylenepentamine (TEPA), consisting mainly of primary and secondary amines, exhibits a high CO2 sorption capacity; however, its poor thermal stability hampers practical utilization in the temperature swing adsorption process for CO2 capture. Here, a facile functionalization of TEPA with 1,2-epoxybutane (EB) substantially enhanced its thermal stability as well as the CO2 adsorption kinetics. Our careful analysis on the liquid-state 13C NMR disclosed the amine state distribution of EB-functionalized TEPA (EB-TEPA). Although the increase in tertiary amine portion induced by EB-functionalization reduced CO2 sorption capacity, the 0.64EB-TEPA (i.e., TEPA functionalized with EB with a TEPA/EB molar ratio of 1:3)/SiO2 showed an excellent long-term stability over the 10 consecutive cycles of adsorption/desorption processes with a CO2 swing capacity of 2.0 mmol CO2 g-1 under dry CO2/N2 (15/85 mol/mol) feed conditions. Also, the first-principles calculation identified the configuration of modified TEPA molecules with XRD measurements, supporting an easy access of CO2 into amine moieties of our modified TEPA molecules.

Original languageEnglish
Pages (from-to)4632-4639
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume57
Issue number13
DOIs
Publication statusPublished - 2018 Apr 4

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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    Park, S., Choi, K., Yu, H. J., Won, Y. J., Kim, C., Choi, M., Cho, S. H., Lee, J., Lee, S. Y., & Lee, J. S. (2018). Thermal Stability Enhanced Tetraethylenepentamine/Silica Adsorbents for High Performance CO2 Capture. Industrial and Engineering Chemistry Research, 57(13), 4632-4639. https://doi.org/10.1021/acs.iecr.7b04912