Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 49, Pages 16020-16025Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808716
Keywords
adsorption separation; ethane; ethylene; metal-organic frameworks; purification
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Funding
- Zhejiang Provincial Natural Science Foundation of China [LR17B060001]
- National Natural Science Foundation of China [21722609, 21436010]
- National Key R&D Program of China [2016YFB0301500]
- Welch Foundation [AX-1730]
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Purification of C2H4 from an C2H4/C2H6 mixture, one of the most important while challenging industrial separation processes, is mainly through energy-intensive cryogenic distillation. Now a family of gallate-based metal-organic framework (MOF) materials is presented, M-gallate (M=Ni, Mg, Co), featuring 3D interconnected zigzag channels, the aperture sizes of which (3.47-3.69 angstrom) are ideally suitable for molecular sieving of ethylene (3.28 x 4.18 x 4.84 angstrom(3)) and ethane (3.81 x 4.08 x 4.82 angstrom(3)) through molecular cross-section size differentiation. Co-gallate shows an unprecedented IAST selectivity of 52 for C2H4 over C2H6 with a C2H4 uptake of 3.37 mmolg(-1) at 298 K and 1 bar, outperforming the state-of-the-art MOF material NOTT-300. Direct breakthrough experiments with equimolar C2H4/C2H6 mixtures confirmed that M-gallate is highly selective for ethylene. The adsorption structure and mechanism of ethylene in the M-gallate was further studied through neutron diffraction experiments.
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