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Nitrogen-doped porous carbons derived from isomeric metal azolate frameworks

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Abstract

Pyrolysis treatments of three [Zn(eim)2] (Heim = 2-ethylimidazole) supramolecular isomers, namely MAF-5 (ANA, 38.6%), MAF-6 (RHO, 55.4%) and MAF-32 (qtz, 0%), possessing different network topologies and porosities, gave morphology-retaining, nitrogen-doped porous carbons denoted as CMAF-5, CMAF-6 and CMAF-32, respectively. Elemental analyses gave nitrogen contents of CMAF-32 (5.45%) > CMAF-5 (5.05%) > CMAF-6 (2.55%), indicating that larger pores are beneficial for the removal of nitrogen contents. Ar sorption measurements for CMAF-5/CMAF-6/CMAF-32 gave pore volumes and surface areas of 0.42/0.65/0.35 cm3 g−1 and 1027/1453/730 m2 g−1, respectively, which are higher than those of their precursors but showing the same trend. The pore sizes of CMAF-5/CMAF-6/CMAF-32 mainly distribute in the ultramicroporous region of 3.7 to 7.5 Å, but still follow CMAF-32 < CMAF-5 < CMAF-6, coincident with the porosities of their precursors. These carbons show remarkable CO2 sorption and CO2/N2 selectivities, consistent with their pore sizes and nitrogen contents. Notably, the IAST CO2/N2 (v/v = 15 : 85, 298 K and 1 bar) selectivities of CMAF-5 and CMAF-32 reach 180 and 262, respectively, which are the highest among all known porous carbon materials. Mixed-gas breakthrough experiments using a 15 : 85 CO2/N2 mixture gave a CO2/N2 selectivity of 234 for CMAF-32.

Graphical abstract: Nitrogen-doped porous carbons derived from isomeric metal azolate frameworks

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Publication details

The article was received on 08 Aug 2017, accepted on 30 Oct 2017 and first published on 30 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06996K
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Nitrogen-doped porous carbons derived from isomeric metal azolate frameworks

    X. Zhang, L. Jiang, Z. Mo, H. Zhou, P. Liao, J. Ye, D. Zhou and J. Zhang, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA06996K

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