A 3D Microporous MOF with mab Topology for Selective CO2 Adsorption and Separation. Issue 3 (19th January 2018)

• Record Type: Journal Article
• Authors: Pal, Arun; Lin, Jian‐Bin; Chand, Santanu; Das, Madhab C.
• Is Part Of: ChemistrySelect. Volume 3:Issue 3(2018)
• Page Start: 917
• Page End: 921
• Publication Date: 2018-01-19
• Subjects: Gas separation -- IAST selectivity -- Microporous MOF -- Selective adsorption -- Topology; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201702680
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: A three dimensional MOF, {[Zn(OBA)(L)0.5 ].DMA}n (IITKGP‐7, IITKGP stands for Indian Institute of Technology Kharagpur), has been synthesized by the combination of a V‐shaped organic acid linker (H2 OBA=4, 4′‐oxybisbenzoic acid) with flexible N, N‐donor spacer (L =2, 5‐bis(3‐pyridyl)‐3, 4 – diaza‐2, 4‐hexadiene), forming a network with mab topology (DMA=N, N‐dimethylacetamide). This MOF is characterized by Fourier‐transform infrared spectroscopy (FTIR), elemental analysis (EA), powder X‐ray diffraction (PXRD), thermo gravimetric analysis (TGA) and single crystal X‐ray diffraction. The framework exhibits rhombus‐shaped channels of approximate size of 5.3 Å x 6.4 Å along crystallographic b axis with a potential solvent accessible volume of 31.8%. Gas sorption measurements of the evacuated framework shows preferential uptake of CO2 at 273 and 295 K under 1 bar over N2 and CH4 . Calculations based on ideal adsorbed solution theory (IAST) show that the selectivity values of CO2 /N2 (15:85) are 57 at 273 K and 121.4 at 295 K, whereas CO2 /CH4 (50:50) selectivity values are 8.4 at 273 K and 8.8 at 295 K under 1 bar. The high CO2 separation selectivity over N2 and CH4 makes this MOF a potential candidate for CO2 separation from flue gas mixture and landfill gas mixture. Abstract : A 3D microporous Zn‐MOF bearing azine functionality showed high CO2 /N2 and CO2 /CH4 separation selectivity under ambient conditions. The IAST selectivity for CO2 /N2 mixture is 57 at 273 K and 121.4 at 295 K; the selectivity for CO2 /CH4 mixture is 8.4 at 273 K and 8.8 at 295 K under 100 kPa pressure.