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Bottom-Up Synthesis of 8-Connected Three-Dimensional Covalent Organic Frameworks for Highly Efficient Ethylene/Ethane Separation
Abstract
Developing cost-/energy-efficient separation techniques for purifying ethylene from an ethylene/ethane mixture is highly important but very challenging in the industrial process. Herein, using a bottom-up [8 + 2] construction approach, we rationally designed and synthesized three three-dimensional covalent organic frameworks (COFs) with 8-connected bcu networks, which can selectively remove ethane from an ethylene/ethane mixture with high efficiency. These COF materials, which are fabricated by the condensation reaction of a customer-designed octatopic aldehyde monomer with linear diamino linkers, possess high crystallinity, good structural robustness, and high porosity. Attributed to the well-organized micro-sized pores with a nonpolar/inert pore environment, these COFs display high ethane adsorption capacity and good selectivity over ethylene, making them among the best ethane-selective adsorbents for ethylene purification. Their excellent ethylene/ethane separation performance is validated by dynamic breakthrough experiments with high-purity ethylene (>99.99%) produced through a single adsorption process. The separation performance surpasses all reported C 2 H 6 -selective COFs and even some benchmark metal–organic frameworks. This work provides important guidance for the design of new adsorbents for value-added gas purification.
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Metadata
- Authors
- Jin, F., Lin, E., Wang, T., Geng, S., Wang, T., Liu, W., Xiong, F., Wang, Z., Chen, Y., Cheng, P., & Zhang, Z.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-03-21
- Volume
- 144
- Issue
- 12
- Pages
- 5643-5652
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W4220854741
- Cited by
- 281
- References
- 51
- FWCI
- 16.55
- Type
- journal article
- Language
- en
- Open access
- closed
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