Effect of purification conditions on gas storage and separations in a chromium-based metal-organic framework MIL-101

Seung Joon Lee, Ji Woong Yoon, You Kyong Seo, Min Bum Kim, Su Kyung Lee, U. Hwang Lee, Young Kyu Hwang, Youn Sang Bae, Jong San Chang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The effect of purification condition of a chromium terephthalate MIL-101 on gas storage (H2, CO2, and C2H2) and C2 hydrocarbon separations was investigated for MIL-101a, MIL-101b, and MIL-101c, which were obtained by three-step sequential purification using hot water/ethanol and aqueous NH4F solution treatments. MIL-101c was the best in terms of gas storage capacities among the three samples possibly due to the removal of free and coordinated terephthalic acids. Remarkably, MIL-101c exhibits among the highest total hydrogen uptake at 50 bar and 77 K (9.9 wt%) and shows considerably large deliverable capacity between 1.5 and 50 bar (7.6 wt%). Moreover, MIL-101c shows among the highest C2H2 storage capacity (6.4 mmol g-1) and deliverable capacity (4.3 mmol g-1) at 1 bar and 313 K. For C2H2/C 2H6, C2H2/C2H 4, and C2H4/C2H6 separations, MIL-101c exhibits higher adsorption capacities, working capacities and adsorption figure of merit (AFM) values while MIL-101b shows higher selectivities and sorbent selection parameters. These results clearly show that a proper purification of MIL-101 is important for gas storage and gas separations.

Original languageEnglish
Pages (from-to)160-165
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume193
DOIs
Publication statusPublished - 2014 Jul 15

All Science Journal Classification (ASJC) codes

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

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