A Pressure Swing Approach to Selective CO₂ Sequestration Using Functionalized Hypercrosslinked Polymers.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Carbon dioxide (CO2) capture is crucial for mitigating climate change.
• Developing efficient and selective CO2 adsorbents is a key challenge.
• Hypercrosslinked polymers (HCPs) offer tunable porosity and surface chemistry for gas separation.

Purpose of the Study:

• To evaluate functionalized HCPs for CO2 capture under realistic industrial conditions.
• To assess the performance of HCPs using pressure swing adsorption (PSA) methodology.
• To demonstrate the separation of CO2 from N2 in simulated flue gas streams.

Main Methods:

• Synthesis of functionalized HCPs with varying surface areas (213–1124 m²/g).
• CO2 adsorption experiments under humid conditions and elevated temperatures.
• Application of promising HCPs in a PSA setup with simulated flue gas.

Main Results:

• HCPs exhibited rapid CO2 uptake, reaching maximum adsorption in under 60 seconds.
• Carbazole, triphenylmethanol, and triphenylamine based HCPs showed high selectivity and capacity.
• These networks effectively concentrated CO2 from >20% to >85% in just two PSA cycles.

Conclusions:

• Functionalized HCPs are highly effective for CO2 capture and separation via PSA.
• The synthesized materials demonstrate suitability for industrial CO2 separation applications.
• This study highlights the potential of readily synthesized porous materials for flue gas treatment.