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Sub-micro porous thin polymer membranes for discriminating H2 and CO2
Xueru Yan1,2, Tianqi Song3, Min Li1,2
1Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, 300072, Tianjin, China.
Nature Communications
|January 20, 2024
Summary
New ultra-thin polymer membranes achieve high selectivity for hydrogen purification and carbon dioxide capture. These advanced materials offer precise molecular sieving for industrial applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Separation Science
Background:
- Existing polymeric membranes lack the required performance for simultaneous hydrogen purification and carbon dioxide capture under industrial conditions.
- There is a critical need for advanced membrane materials capable of precise molecular discrimination for gas separations.
Purpose of the Study:
- To develop ultra-thin polymeric membranes with high permeance and selectivity for efficient hydrogen (H2) purification and carbon dioxide (CO2) capture.
- To engineer precise molecular sieving capabilities into polymer membranes for demanding industrial applications.
Main Methods:
- Fabrication of ultra-thin (13-30 nm) polymer membranes via controllable transformation of amine-linked polymer (ALP) films.
- Conversion of ALP films into benzimidazole-and-amine-linked polymer (BIALP) layers to create sub-micro pores.
- Characterization of membrane performance under industry-relevant conditions, including high pressure and temperature.
Main Results:
- Achieved unprecedented H2/CO2 selectivity of 120 with a H2 permeance of 315 GPU.
- Demonstrated excellent thermal stability up to 300°C and high-pressure resistance up to 11 bar.
- Successfully created ultra-thin BIALP membranes with precise molecular sieving capabilities.
Conclusions:
- The developed BIALP membranes offer a promising solution for simultaneous H2 purification and CO2 capture with superior performance.
- This work presents a novel concept for designing advanced porous polymeric membranes for precise molecular discrimination in gas separations.
- The membranes' high selectivity, permeance, and stability open avenues for their application in industrial gas separation processes.
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