Extraordinarily selective adsorption of CO2 over N2 in a polyethyleneimine-impregnated NU-1000 material

Jo Hong Kang, Tae Ung Yoon, Seo Yul Kim, Min Bum Kim, Hyung Ju Kim, Hee Chul Yang, Youn Sang Bae

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Developing an efficient adsorbent for selective separation and capture of CO2 from CO2/N2 mixture is an important and challenging issue for mitigating global warming. In this study, we posited that high CO2/N2 selectivity could be obtained by impregnating polyethyleneimine (PEI) within the pores of NU-1000, a zirconium-based metal-organic framework (MOF), since it has a high surface area (∼2320 m2/g) and free and exposed –OH groups but does not have unsaturated metal sites possibly having strong interactions with N2 molecules. A series of PEI-impregnated NU-1000 (PEI(x)@NU-1000) materials with varied PEI loadings have been successfully prepared. As reasoned, PEI(50)@NU-1000 showed the highest CO2/N2 selectivity among the PEI-loaded adsorbents in the literature under similar conditions. Remarkably, it exhibited extremely high CO2/N2 selectivities (∼8000) at low pressures and a very high CO2/N2 selectivity (661) at a typical pressure of flue gas (1 bar). Furthermore, PEI(50)@NU-1000 could efficiently separate CO2/N2 mixture under a dynamic flow condition and maintained its CO2 uptakes during three consecutive adsorption and desorption.

Original languageEnglish
Pages (from-to)84-91
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume281
DOIs
Publication statusPublished - 2019 Jun

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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