Homodiamine-functionalized metal-organic frameworks with a MOF-74-type extended structure for superior selectivity of CO<inf>2</inf> over N<inf>2</inf>

Je Seon Yeon, Woo Ram Lee, Nam Woo Kim, Hyuna Jo, Hanyeong Lee, Jeong Hwa Song, Kwang Soo Lim, Dong Won Kang, Jeong Gil Seo, Dohyun Moon, Brian Wiers, Chang Seop Hong

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38 Citations (Scopus)

Abstract

A porous Mg<inf>2</inf>(dondc) framework (H<inf>4</inf>dondc = 1,5-dioxido-2,6-naphthalenedicarboxylic acid) with open metal sites was prepared and functionalized with primary or secondary diamines (en = ethylenediamine, mmen = N,N′-dimethylethylenediamine, or ppz = piperazine). The CO<inf>2</inf> adsorption was substantial under post-combustion flue gas conditions as compared to other reported metal-organic frameworks. Interestingly, the IR spectroscopic measurements demonstrated that the CO<inf>2</inf> adsorption mechanism is based on the combination of physisorption and chemisorption. The CO<inf>2</inf> adsorption capacity of 1-mmen was greater than that of 1-en and 1-ppz, which can likely be attributed to the basicity of the free amine groups tethered to the open coordination sites. Ultrahigh selectivity and superior dynamic separation of CO<inf>2</inf> over N<inf>2</inf> were evident in 1-ppz. Such exceptional CO<inf>2</inf> uptake and CO<inf>2</inf>/N<inf>2</inf> selectivity of diamine-functionalized materials hold potential promise for post-combustion CO<inf>2</inf> capture applications.

Original languageEnglish
Pages (from-to)19177-19185
Number of pages9
JournalJournal of Materials Chemistry A
Volume3
Issue number37
DOIs
Publication statusPublished - 2015 Aug 11

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Yeon, J. S., Lee, W. R., Kim, N. W., Jo, H., Lee, H., Song, J. H., Lim, K. S., Kang, D. W., Seo, J. G., Moon, D., Wiers, B., & Hong, C. S. (2015). Homodiamine-functionalized metal-organic frameworks with a MOF-74-type extended structure for superior selectivity of CO<inf>2</inf> over N<inf>2</inf> Journal of Materials Chemistry A, 3(37), 19177-19185. https://doi.org/10.1039/c5ta02357b