Journal
NATURE CHEMISTRY
Volume 13, Issue 10, Pages 933-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41557-021-00740-z
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Funding
- National Natural Science Foundation of China [21975044, 21971038, 21922810]
- Fujian Provincial Department of Science and Technology [2019H6012, 21019L3004]
- Welch Foundation [AX-1730]
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Porous materials show great potential for cost- and energy-efficient separation processes, with a microporous hydrogen-bonded organic framework demonstrated to have good ethylene selectivity over ethane through a gating mechanism. The material exhibited stable performance under harsh conditions and validated high purity ethylene separation through breakthrough experiments.
Porous materials are very promising for the development of cost- and energy-efficient separation processes, such as for the purification of ethylene from ethylene/ethane mixture-an important but currently challenging industrial process. Here we report a microporous hydrogen-bonded organic framework that takes up ethylene with very good selectivity over ethane through a gating mechanism. The material consists of tetracyano-bicarbazole building blocks held together through intermolecular CN center dot center dot center dot H-C hydrogen bonding interactions, and forms as a threefold-interpenetrated framework with pores of suitable size for the selective capture of ethylene. The hydrogen-bonded organic framework exhibits a gating mechanism in which the threshold pressure required for guest uptake varies with the temperature. Ethylene/ethane separation is validated by breakthrough experiments with high purity of ethylene (99.1%) at 333 K. Hydrogen-bonded organic frameworks are usually not robust, yet this material was stable under harsh conditions, including exposure to strong acidity, basicity and a variety of highly polar solvents.
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