Diamine Grafting of Pyrazole-Based MOF-303 for Diluted-Source CO₂ Capture

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Amine-functionalized materials are key for CO2 capture via carbamate formation.
• Grafting amines onto porous solids is effective, especially at low CO2 levels.

Purpose of the Study:

• To develop a novel strategy for anchoring amine functionalities onto Metal-Organic Framework (MOF)-303.
• To investigate the CO2 capture capabilities and adsorption mechanisms of the modified MOF.

Main Methods:

• Grafting ethylenediamine (EDA) onto MOF-303 using pyrazole linkers as anchoring sites.
• Characterization using FT-IR, SS-NMR, synchrotron X-ray diffraction, and computational modeling.
• CO2 uptake measurements at various concentrations and pressures, including breakthrough experiments.

Main Results:

• MOF-303#EDA demonstrated significant CO2 uptake (0.71 mmol g-1 at 450 ppm).
• High CO2 uptake (2.5 mmol g-1) was observed at 0.15 bar.
• Excellent cyclability was confirmed through breakthrough experiments.

Conclusions:

• The novel amine grafting strategy on MOF-303 is effective for CO2 capture.
• MOF-303#EDA is a promising adsorbent for industrial point source CO2 capture.
• The study provides in-depth insights into the grafting mechanism and CO2 interaction.