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Optimal Host-Guest Fit in Metal-Organic Frameworks to Achieve Record C2H2 Packing Density for Trace Acetylene Capture
Jun-Hao Wang1,2, Yu-Chi Wan1,2, Ji-Ning Cao1,2
1Institute of Crystalline Materials, Shanxi University, Taiyuan, 030006, China.
Angewandte Chemie (International Ed. in English)
|December 27, 2025
Summary
Researchers designed a novel metal-organic framework (MOF) for highly efficient acetylene (C2H2) capture. This optimized host-guest fit material achieves superior performance in separating acetylene from ethylene, even in humid conditions.
Area of Science:
- Materials Science
- Chemical Engineering
- Adsorption Science
Background:
- Host-guest fit is crucial for molecular recognition and separation processes.
- Designing porous materials with precise host-guest interactions for trace impurity removal is challenging.
- Existing methods lack atomic-level understanding for optimizing host-guest fit in adsorbents.
Purpose of the Study:
- To systematically design a series of pillared-layer metal-organic frameworks (MOFs) for optimal host-guest fit.
- To enhance acetylene (C2H2) adsorption performance by tuning the MOF structure.
- To achieve high-purity ethylene (C2H4) production from trace acetylene impurities under challenging conditions.
Main Methods:
- Systematic synthesis of a pillared-layer MOF series (CPL-1) with varying bulky groups.
- Characterization of the synthesized MOFs for their adsorption properties.
- In situ single-crystal X-ray diffraction to elucidate structural changes and host-guest interactions.
Main Results:
- The best-fit MOF, SXU-10, demonstrated superior very-low-pressure C2H2 capture, reaching near saturation at 2 kPa.
- Record C2H2 packing densities achieved: 483.9 mg cm⁻³ at 1 kPa and 733.97 mg cm⁻³ at 100 kPa.
- SXU-10 achieved high C2H2 uptake (1.18 mmol g⁻¹ at 1 kPa) and C2H2/C2H4 selectivity (133) under humid conditions (80% RH), enabling polymer-grade C2H4 production.
Conclusions:
- Optimized host-guest shape fit at sub-ångström precision is key to enhanced adsorption performance and selectivity.
- The designed MOF (SXU-10) exhibits exceptional stability, humidity tolerance, and efficient C2H2 capture for industrial applications.
- This study provides molecular-level insights into engineering bioinspired porous adaptive materials for gas separation.
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