Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF-8 via Postsynthetic Modification

Zhijuan Zhang, Shikai Xian, Qibin Xia, Haihui Wang, Zhong Li, Jing Li

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

Imidazolate framework ZIF-8 is modified via postsynthetic method using etheylenediamine to improve its adsorption performance toward CO2. Results show that the BET surface area of the modified ZIF-8 (ED-ZIF-8) increases by 39%, and its adsorption capacity of CO2 per surface area is almost two times of that on ZIF-8 at 298 K and 25 bar. H2O uptake on the ED-ZIF-8 become obviously lower compared to the ZIF-8. The ED-ZIF-8 selectivity for CO2/N2 adsorption gets significantly improved, and is up to 23 and 13.9 separately at 0.1 and 0.5 bar, being almost twice of those of the ZIF-8. The isosteric heat of CO2 adsorption (Qst) on the ED-ZIF-8 becomes higher, while Qst of N2 gets slightly lower compared to those on the ZIF-8 Furthermore, it suggests that the postsynthetic modification of the ZIF-8 not only improves its adsorption capacity of CO2 greatly, but also enhances its adsorption selectivity for CO2/N2/H2O significantly.

Original languageEnglish
Pages (from-to)2195-2206
Number of pages12
JournalAIChE Journal
Volume59
Issue number6
DOIs
Publication statusPublished - Jun 1 2013

Keywords

  • Adsorption/gas
  • Isosteric heat of adsorption
  • Modification
  • Selectivity
  • ZIF-8

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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