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Published on: August 16, 2018
Bifunctional Poly(ionic liquid) Membranes for CO2 Utilization
Maria Atlaskina1, Kirill Smorodin1, Sergey Kryuchkov1
1Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia.
Polymers
|May 13, 2026
Summary
This study developed bifunctional polymer ionic liquid (PIL) membranes for integrated carbon capture and conversion. Block copolymers showed high catalytic conversion and selective CO2 transport, advancing carbon utilization technologies.
Area of Science:
- Materials Science
- Chemical Engineering
- Polymer Chemistry
Background:
- Developing efficient materials for carbon capture and utilization (CCU) is crucial for mitigating climate change.
- Existing technologies often require separate steps for CO2 capture and subsequent conversion.
- Polymer ionic liquids (PILs) show potential but often function as either catalysts or membrane materials, not both.
Purpose of the Study:
- To create and evaluate bifunctional membranes based on polymer ionic liquids (PILs) that integrate CO2 capture and catalytic conversion.
- To investigate the dual functionality of PILs under both catalytic and gas transport conditions.
- To explore the effect of polymer architecture and anion type on membrane performance.
Main Methods:
- Synthesis of imidazolium-based PIL homopolymers and block copolymers with polystyrene.
- Characterization of catalytic activity for CO2 cycloaddition to epichlorohydrin.
- Evaluation of gas transport properties using pure gases (N2, O2, CO2) and a simulated flue gas mixture.
- Analysis of membrane morphology using scanning electron microscopy.
Main Results:
- Block copolymer PILs demonstrated higher catalytic conversion (up to 82.7%) compared to homopolymers.
- Chloride-containing block copolymers achieved a good balance of CO2 permeability (up to 7.5 Barrer) and CO2/N2 selectivity (18-22).
- Iodide-containing PILs showed higher selectivity (up to 30) but lower CO2 permeability, correlating with observed microheterogeneity.
Conclusions:
- PIL-based membranes can be designed to exhibit both catalytic activity for CO2 conversion and selective gas transport.
- By tuning polymer and anion structure, bifunctional PIL membranes offer a promising platform for integrated CCU processes.
- This work highlights the potential of PILs for enhancing carbon capture and utilization efficiency.
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