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 journal › Article

100 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 2013

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Keywords

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

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Biotechnology
  • Environmental Engineering

Cite this

Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF-8 via Postsynthetic Modification. / Zhang, Zhijuan; Xian, Shikai; Xia, Qibin; Wang, Haihui; Li, Zhong; Li, Jing.

In: AICHE Journal, Vol. 59, No. 6, 06.2013, p. 2195-2206.

Research output: Contribution to journal › Article

Zhang, Z, Xian, S, Xia, Q, Wang, H, Li, Z & Li, J 2013, 'Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF-8 via Postsynthetic Modification', AICHE Journal, vol. 59, no. 6, pp. 2195-2206. https://doi.org/10.1002/aic.13970
Zhang Z, Xian S, Xia Q, Wang H, Li Z, Li J. Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF-8 via Postsynthetic Modification. AICHE Journal. 2013 Jun;59(6):2195-2206. https://doi.org/10.1002/aic.13970
Zhang, Zhijuan ; Xian, Shikai ; Xia, Qibin ; Wang, Haihui ; Li, Zhong ; Li, Jing. / Enhancement of CO2 Adsorption and CO2/N2 Selectivity on ZIF-8 via Postsynthetic Modification. In: AICHE Journal. 2013 ; Vol. 59, No. 6. pp. 2195-2206.
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N2 - 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.

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