Programmed fluorine binding engineering in anion-pillared metal-organic framework for record trace acetylene capture
Xiao-Wen Gu1, Enyu Wu1, Jia-Xin Wang1
1State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Science Advances
|August 4, 2023
Summary
Researchers engineered fluorine binding in metal-organic frameworks for efficient acetylene (C2H2) capture. This novel material, ZJU-300a, demonstrates superior C2H2 uptake and selectivity, crucial for trace gas separation.
Area of Science:
- Materials Science
- Chemical Engineering
- Adsorption Science
Background:
- Porous physisorbents offer low-energy solutions for trace gas capture.
- Challenges include weak sorbate-sorbent interactions, limiting uptake and selectivity at low concentrations.
- Selective separation of acetylene (C2H2) from ethylene (C2H4) is critical in industrial processes.
Purpose of the Study:
- To develop a physisorbent with enhanced C2H2 binding affinity for trace gas separation.
- To engineer fluorine binding sites within anion-pillared metal-organic frameworks (MOFs).
- To achieve benchmark C2H2 capture from C2H4 mixtures.
Main Methods:
- Programmed fluorine binding engineering in anion-pillared MOFs.
- Design and synthesis of a novel MOF material, ZJU-300a.
- Gas adsorption isotherms and breakthrough experiments to evaluate performance.
Main Results:
- ZJU-300a exhibits an ultrastrong C2H2 binding affinity due to a multiple-site fluorine binding model.
- Record C2H2 uptake of 3.23 mmol/g at 0.01 bar and 296 K.
- Exceptional C2H2/C2H4 selectivity of 1672 and maximal dynamic selectivity of 264 in breakthrough tests.
Conclusions:
- Programmed fluorine binding engineering is an effective strategy for enhancing C2H2 capture.
- ZJU-300a demonstrates high performance for trace C2H2 separation from C2H4.
- The developed MOF offers a promising solution for selective gas separation with low energy consumption.
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