A microporous MOF with a polar pore surface exhibiting excellent selective adsorption of CO2 from CO2–N2 and CO2–CH4 gas mixtures with high CO2 loading. Issue 44 (25th October 2017)

• Record Type: Journal Article
• Authors: Pal, Arun; Chand, Santanu; Elahi, Syed Meheboob; Das, Madhab C.
• Is Part Of: Dalton transactions. Volume 46:Issue 44(2017)
• Page Start: 15280
• Page End: 15286
• Publication Date: 2017-10-25
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7dt03341a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A microporous MOF (IITKGP-5) with polar pore surface exhibits highly selective sorption of CO2 from flue gas as well as landfill gas mixture with IAST selectivity for 435.5 and 151.6 at 273 K/100 kPa respectively. Abstract : A microporous MOF {[Zn(SDB)(L)0.5 ]·S} n (IITKGP-5 ) with a polar pore surface has been constructed by the combination of a V-shaped –SO2 functionalized organic linker (H2 SDB = 4, 4′-sulfonyldibenzoic acid) with an N-rich spacer (L = 2, 5-bis(3-pyridyl)-3, 4-diaza-2, 4-hexadiene), forming a network with sql ( 2, 6L1 ) topology.IITKGP-5 is characterized by TGA, PXRD and single crystal X-ray diffraction. The framework exhibits lozenge-shaped channels of an approximate size of 4.2 × 5.6 Å 2 along the crystallographic b axis with a potential solvent accessible volume of 26%. The activatedIITKGP-5a revealed a CO2 uptake capacity of 56.4 and 49 cm 3 g −1 at 273 K/1 atm and 295 K/1 atm, respectively. On the contrary, it takes up a much smaller amount of CH4 (17 cm 3 g −1 at 273 K and 13.6 cm 3 g −1 at 295 K) and N2 (5.5 cm 3 g −1 at 273 K; 4 cm 3 g −1 at 295 K) under 1 atm pressure exhibiting its potential for a highly selective adsorption of CO2 from flue gas as well as a landfill gas mixture. Based on the ideal adsorbed solution theory (IAST), a CO2 /N2 selectivity of 435.5 and a CO2 /CH4 selectivity of 151.6 have been realized at 273 K/100 kPa. The values at 295 K are 147.8 for CO2 /N2 and 23.8 for CO2 /CH4 gas mixtures under 100 kPa. In addition, this MOF nearly approaches the target values proposed for PSA and TSA processes for practical utility exhibiting its prospect for flue gas separation with a CO2 loading capacity of 2.04 mmol g −1 .