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Structural dimensionality governing CO2/C2H2 separation in MWW zeolites.
Ang Li1, Xiao-Xia Zhang1, Yuqi Zhang2
1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, PR China. xuzhihu@licp.cas.cn.
Materials Horizons
|January 28, 2026
Summary
Structural dimensionality is key for separating carbon dioxide (CO2) and acetylene (C2H2) using MWW zeolites. Monolayer MWW materials show superior performance over 3D structures, offering a new design strategy for molecular sieving.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Zeolites with the MWW framework structure are widely investigated for gas separation applications.
- Controlling the structural dimensionality of zeolites is crucial for optimizing their separation performance.
Purpose of the Study:
- To investigate the impact of structural dimensionality on carbon dioxide (CO2) and acetylene (C2H2) separation using MWW zeolites.
- To compare the separation efficiency of 2D MWW monolayers versus 3D MWW frameworks.
Main Methods:
- Experimental breakthrough experiments were conducted to evaluate gas separation performance.
- Density Functional Theory (DFT) calculations were employed to analyze adsorption mechanisms and transport properties.
- Characterization of MWW materials with varying structural dimensionality.
Main Results:
- Exfoliated 2D MWW monolayers demonstrated significantly improved CO2/C2H2 separation compared to their 3D counterparts.
- Monolayer materials exhibited an extended breakthrough interval and higher selectivity for CO2 over C2H2.
- DFT analysis revealed site-specific adsorption preferences and reduced diffusion barriers in the 2D structures.
Conclusions:
- Structural dimensionality is a critical design parameter for enhancing molecular sieving capabilities in MWW zeolites.
- 2D MWW materials offer a promising platform for efficient CO2/C2H2 separation.
- This study establishes dimensionality as a novel design axis for advanced molecular sieve development.
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