High-Selective CO₂ Capture in Amine-Decorated Al-MOFs

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Amine-functionalized metal-organic frameworks (MOFs) are effective for CO2 capture due to high capacity, selectivity, and regenerability.
• Post-combustion capture is crucial for reducing CO2 emissions and achieving carbon neutrality goals.

Purpose of the Study:

• To prepare and evaluate an ethylenediamine (ED)-decorated Al-based MOF (ED@MOF-520) for CO2 adsorption and separation from N2.
• To assess the CO2 capture performance, selectivity, and stability of the synthesized ED@MOF-520.

Main Methods:

• Synthesis of ethylenediamine (ED)-decorated Al-based MOFs (ED@MOF-520) with high surface area and porosity.
• Evaluation of CO2/N2 adsorption and separation performance at 273 K.
• Analysis of CO2 adsorption heat and cycle stability.

Main Results:

• ED@MOF-520 demonstrated superior CO2 capture performance compared to blank MOF-520.
• Achieved a CO2/N2 separation factor of 50 at 273 K, a 185% increase in separation efficiency.
• Exhibited a moderate CO2 adsorption heat (29 kJ mol-1) and good cycle stability.

Conclusions:

• ED@MOF-520 is a highly promising adsorbent for efficient CO2 capture and separation from N2 in post-combustion processes.
• The material's performance supports its application in addressing carbon peak and carbon neutrality targets.
• The enhanced CO2/N2 separation efficiency highlights the potential of amine-functionalized MOFs in carbon capture technologies.