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Improving Ethane/Ethylene Separation Performance under Humid Conditions by Spatially Modified Zeolitic Imidazolate
Dong Luo1, Yun-Lei Peng2,3,4, Mo Xie1
1College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, P.R. China.
ACS Applied Materials & Interfaces
|February 22, 2022
Summary
A new gyroidal zeolitic imidazolate framework (ZIF), ZnBAIm, demonstrates exceptional stability and high ethane/ethylene selectivity, even under humid conditions. This material offers a promising solution for efficient gas separation applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Gas separation performance of crystalline porous materials often degrades in humid conditions due to instability or water competition.
- Zeolitic imidazolate frameworks (ZIFs) show promise for gas separation due to their stability, but pore engineering is limited.
- Common ZIFs lack sufficient substituent positions for effective pore modification.
Purpose of the Study:
- To design and synthesize a novel gyroidal ZIF with enhanced pore engineering capabilities.
- To improve the stability and gas separation performance of ZIFs, particularly under humid conditions.
- To investigate the structure-property relationships governing ethane/ethylene selectivity in modified ZIFs.
Main Methods:
- Synthesis and characterization of a new gyroidal ZIF, ZnBAIm, based on a Schiff base moiety.
- Evaluation of thermal, chemical, and mechanical stabilities under various harsh conditions.
- Gas separation performance testing using breakthrough experiments, including under highly humid conditions.
- Density functional theory calculations and kinetic adsorption studies to elucidate separation mechanisms.
Main Results:
- ZnBAIm exhibits superior thermal (up to 480 °C), chemical (5 M NaOH), and mechanical (190 MPa) stability compared to existing ZIFs.
- ZnBAIm demonstrates significantly improved ethane/ethylene selectivity and separation performance under humid conditions (up to 80% RH).
- Efficient separation of C2H6/C2H4 binary mixtures was achieved, unaffected by high humidity.
Conclusions:
- The modified pore and window sizes in ZnBAIm are key to its enhanced separation performance.
- ZnBAIm offers excellent stability and selectivity for ethane/ethylene separation, even in the presence of water vapor.
- The material's performance is attributed to a combination of thermodynamic and kinetic factors, making it suitable for practical gas separation.
Keywords:
C2H6/C2H4 separationdispersion interactionhydrophobicitythermal/chemical/mechanical stabilitieszeolitic imidazolate framework (ZIF)
