Microporous Polymelamine Framework Functionalized with Re(I) Tricarbonyl Complexes for CO₂ Absorption and Reduction

Area of Science:

• Materials Science
• Inorganic Chemistry
• Catalysis

Background:

• Development of advanced porous materials for gas capture and conversion is crucial.
• Rhenium complexes offer unique electronic properties for catalytic applications.

Purpose of the Study:

• To synthesize and characterize a novel rhenium-based porous hybrid material.
• To evaluate its performance in CO2 absorption and CO2 reduction reaction (CO2RR).

Main Methods:

• Polymeric complex formation via reaction of Re(CO)5Cl with a melamine-benzene-1,3,5-tricarboxaldehyde network.
• Characterization using FTIR, NMR, SEM, XPS, ICP, XRD, and cyclic voltammetry (CV).
• Gas absorption measurements at 295 K and 1 atm.
• Electrocatalytic CO2RR testing at -1.8 V vs. Ag/AgCl.

Main Results:

• Successful synthesis of a rhenium-based porous hybrid material.
• Achieved CO2 absorption capacity of approximately 44 cm3/g at 295 K and 1 atm.
• Observed catalytic activity for CO2RR with a turn over-number (TON) of ~6.3 over 80 minutes.

Conclusions:

• The novel rhenium-based porous hybrid material exhibits promising CO2 absorption capabilities.
• The material demonstrates catalytic potential for CO2 reduction.
• Potential applications as filler in membranes or columns for gas separation and catalysis are envisaged.