Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202114132
Keywords
acetylene; cationic frameworks; metal-organic frameworks; physisorption; ultramicroporous MOFs
Categories
Funding
- IISER Pune
- Alexander von Humboldt foundation
- CSIR
- DST [GAP/DST/CHE-19-447/30119447]
- SERB [CRG/2019/000906]
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By utilizing a series of square lattice topology metal-organic frameworks, efficient separation of C2H2 from industrial C2-C1 impurities has been achieved, introducing a new crystal engineering blueprint for designing C2H2-selective layered metal-organic physisorbents.
Energy-efficient selective physisorption driven C2H2 separation from industrial C2-C1 impurities such as C2H4, CO2 and CH4 is of great importance in the purification of downstream commodity chemicals. We address this challenge employing a series of isoreticular cationic metal-organic frameworks, namely iMOF-nC (n=5, 6, 7). All three square lattice topology MOFs registered higher C2H2 uptakes versus the competing C2-C1 gases (C2H4, CO2 and CH4). Dynamic column breakthrough experiments on the best-performing iMOF-6C revealed the first three-in-one C2H2 adsorption selectivity guided separation of C2H2 from 1:1 C2H2/CO2, C2H2/C2H4 and C2H2/CH4 mixtures. Density functional theory calculations critically examined the C2H2 selective interactions in iMOF-6C. Thanks to the abundance of square lattice topology MOFs, this study introduces a crystal engineering blueprint for designing C2H2-selective layered metal-organic physisorbents, previously unreported in cationic frameworks.
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