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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Tuning Pore Polarization to Boost Ethane/Ethylene Separation Performance in Hydrogen-Bonded Organic Frameworks
Yunzhe Zhou1, Cheng Chen1, Rajamani Krishna2
1State Key Lab of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Angewandte Chemie (International Ed. in English)
|April 27, 2023
Summary
This study developed novel hydrogen-bonded organic frameworks (HOFs) for efficient ethane/ethylene separation. The new HOF-NBDA material selectively adsorbs ethane, enabling one-step production of high-purity ethylene.
Area of Science:
- Materials Science
- Chemical Engineering
- Separation Science
Background:
- Hydrogen-bonded organic frameworks (HOFs) offer potential for energy-efficient ethane/ethylene separation.
- Achieving selective adsorption of ethane over ethylene in HOFs remains challenging for one-step ethylene acquisition.
Purpose of the Study:
- To enhance ethane/ethylene separation performance in graphene-sheet-like HOFs by tuning pore polarization.
- To develop a HOF capable of the reverse-order adsorption of ethane and ethylene for practical applications.
Main Methods:
- In situ solid phase transformation of HOF-NBDA(DMA) to HOF-NBDA upon heating.
- Tuning pore surface polarity from electronegative to neutral/nonpolar.
- Gas adsorption capacity and breakthrough experiments at 298 K.
- Theoretical calculations to understand adsorption mechanisms.
Main Results:
- HOF-NBDA exhibits a nonpolar pore surface, selectively adsorbing ethane.
- HOF-NBDA shows significantly higher C2H6/C2H4 separation performance (23.4 cm3/g capacity difference, 136% uptake ratio) compared to HOF-NBDA(DMA).
- Practical breakthrough experiments demonstrate HOF-NBDA produces polymer-grade C2H4 from a 1/99 C2H6/C2H4 mixture with high productivity (29.2 L/kg).
Conclusions:
- Tuning pore polarization in HOFs is an effective strategy to achieve selective ethane adsorption.
- HOF-NBDA enables efficient, one-step separation of ethylene from ethane/ethylene mixtures.
- The developed HOF shows promise for industrial applications in energy-saving gas separation.
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