Conjugated microporous polymer networks with adjustable microstructures for high CO₂ uptake capacity and selectivity

Area of Science:

• Materials Science
• Polymer Chemistry
• Separation Science

Background:

• Conjugated microporous polymers (CMPs) are advanced porous materials with tunable structures.
• Developing efficient adsorbents for carbon dioxide (CO2) capture is crucial for environmental sustainability.

Purpose of the Study:

• To synthesize and characterize a series of phenylene-based conjugated microporous polymers (CMPs).
• To investigate the CO2 adsorption capacity and CO2/N2 selectivity of the synthesized CMPs.

Main Methods:

• Synthesis of phenylene-based CMPs with varying monomer lengths and geometries (A6 + Mx type).
• Characterization of BET surface area using gas adsorption analysis.
• Evaluation of CO2 adsorption capacity and CO2/N2 selectivity under specific temperature and pressure conditions.

Main Results:

• Synthesized CMPs exhibited tunable BET surface areas ranging from 571 to 1115 m2 g-1.
• A6CMP-1 demonstrated a high CO2 adsorption capacity of 1218 mg g-1 at 318 K and 60 bar.
• A6CMP-4 showed a significant CO2/N2 selectivity ratio of 47.

Conclusions:

• The study successfully developed phenylene-based CMPs with controllable surface areas.
• The synthesized CMPs show promising performance for CO2 capture and separation applications.
• Monomer design is a key factor in optimizing the adsorption properties of CMPs.