Nitrogen-Rich Porous Organic Polymers with Supported Ag Nanoparticles for Efficient CO₂ Conversion

Area of Science:

• Materials Science
• Catalysis
• Environmental Chemistry

Background:

• Rising CO2 emissions and climate change necessitate efficient CO2 conversion technologies.
• Developing multifunctional catalysts for CO2 valorization is a critical challenge.

Purpose of the Study:

• To synthesize novel porous organic polymers (NPOPs) for CO2 capture and conversion.
• To develop highly dispersed silver-supported catalysts (Ag@NPOPs) for high-value chemical synthesis from CO2.

Main Methods:

• Synthesis of NPOPs via copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC).
• Impregnation and in situ reduction to form Ag nanoparticles within NPOPs.
• Application of Ag@NPOPs in catalytic CO2 conversion reactions with propargylic amines and terminal alkynes.

Main Results:

• NPOPs exhibited high CO2 adsorption capacities (84.0 and 63.7 mg g-1).
• Ag@NPOPs demonstrated high catalytic activity for carboxylative cyclization (TOF 1125.1 h-1) and carboxylation (TOF 90.9 h-1).
• The catalyst showed excellent stability, withstanding five recycling cycles without significant activity loss.

Conclusions:

• The developed Ag@NPOPs are effective and stable catalysts for converting CO2 into valuable chemicals under mild conditions.
• These materials offer a promising approach for CO2 utilization and mitigating climate change.