Pore partition in two-dimensional covalent organic frameworks
Xiaoyi Xu1, Xinyu Wu1, Kai Xu1
1State Key Laboratory of Silicon and Advanced Semiconductor Materials, International Research Center for X Polymers, Department of Polymer Science and Engineering, Zhejiang University, 310027, Hangzhou, China.
Nature Communications
|June 8, 2023
Summary
Researchers developed a pore partition strategy for covalent organic frameworks (COFs), creating the smallest ultramicroporous COF channels. This breakthrough enables efficient separation of hexane isomers, significantly boosting research octane number values.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Covalent organic frameworks (COFs) are tunable crystalline polymers.
- Existing COFs are primarily mesoporous or microporous.
- Developing ultramicroporous (<1 nm) COFs presents a significant challenge.
Purpose of the Study:
- To introduce a pore partition strategy for creating ultramicroporous COFs.
- To synthesize COFs with the smallest pores to date.
- To demonstrate the application of these COFs in isomer separation.
Main Methods:
- Implementing a pore partition strategy by inserting building blocks into prebuilt COF frameworks.
- Segmenting mesopores into multiple uniform ultramicroporous domains.
- Characterizing the resulting framework's pore size and structure.
Main Results:
- Successfully created COFs with wedge-shaped ultramicroporous channels down to 6.5 Å.
- Achieved the smallest pore size reported for any COF.
- Demonstrated highly efficient separation of five hexane isomers via a sieving effect.
- Attained average research octane number (RON) values up to 99 for isomer blends.
Conclusions:
- The pore partition strategy is effective for creating ultramicroporous COFs.
- The developed COFs show exceptional performance in hexane isomer separation.
- This work advances the functional exploitation of COFs for tailored applications.
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