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A microporous MOF with polar pore surface exhibiting excellent selective adsorption of CO2 from CO2-N2 and CO2-CH4 gas mixture with high CO2 loading

Abstract

A microporous MOF {[Zn(SDB)(L)0.5].S}n (IITKGP-5) with polar pore surface has been constructed by combination of a V-shaped –SO2 functionalized organic linker (H2SDB = 4, 4'-sulfonyldibenzoic acid) with 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 approximate size of 4.2 x 5.6 Å2 along crystallographic b axis with a potential solvent accessible volume of 26 %. The activated IITKGP-5a revealed CO2 uptake capacity of 56.4 and 49 cm3g-1 at 273K/1 atm and 295 K/1 atm respectively. On contrary, it takes up much lower amount of CH4 (17 cm3g-1 at 273 K and 13.6 cm3g-1 at 295 K) and N2 (5.5 cm3g-1 at 273 K; 4 cm3g-1 at 295 K) under 1 atm pressure exhibiting its potential for highly selective adsorption of CO2 from flue gas as well as landfill gas mixture. Based on ideal adsorbed solution theory (IAST), CO2/N2 selectivity of 435.5 and CO2/CH4 selectivity of 151.6 have been realized under 273 K/100 kPa. The values at 295 K are 147.8 for CO2/N2 and 23.8 for CO2/CH4 gas mixture under 100 kPa. In addition, this MOF nearly approaches to the target values proposed for PSA and TSA process for practical utility exhibiting its prospective for flue gas separation with a CO2 loading capacity of 2.04 mmolg-1.

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Publication details

The article was received on 08 Sep 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT03341A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    A microporous MOF with polar pore surface exhibiting excellent selective adsorption of CO2 from CO2-N2 and CO2-CH4 gas mixture with high CO2 loading

    A. Pal, S. Chand, S. M. Elahi and M. C. Das, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03341A

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