Poly(ionic liquid)-coated hydroxy-functionalized carbon nanotube nanoarchitectures with boosted catalytic performance...

Area of Science:

• Materials Science
• Catalysis
• Green Chemistry

Background:

• Poly(ionic liquids) (PILs) show promise for carbon dioxide (CO2) fixation due to high ionic densities.
• Developing efficient, metal-free methods to enhance PIL catalytic activity remains a significant challenge.
• Existing PIL catalysts often require co-catalysts or harsh conditions, limiting their practical application.

Purpose of the Study:

• To develop novel poly(ionic liquid)-coated carbon nanotube nanoarchitectures (CNTs@PIL) for enhanced CO2 fixation.
• To investigate the structure-property-performance relationships of functionalized CNTs hybridized with PILs.
• To achieve metal- and co-catalyst-free catalytic cycloaddition of CO2 to epoxides with improved efficiency and selectivity.

Main Methods:

• Facile preparation of CNTs@PIL nanoarchitectures via noncovalent, in-situ polymerization.
• Systematic investigation of different carbon nanotubes (CNTs) and PILs effects on composite properties.
• Characterization of porosity, CO2 capture, swelling, diffusion, and catalytic performance.

Main Results:

• Hybridization of PIL with hydroxyl- or carboxyl-functionalized CNTs (CNT-OH, CNT-COOH) increased porosity, CO2 capture, swelling, and diffusion.
• The optimal CNT-OH@PIL catalyst exhibited over 4.5 times higher catalytic efficiency for CO2 cycloaddition to propylene oxide compared to pure PIL.
• CNT-OH@PIL demonstrated high CO2/N2 adsorptive selectivity, broad substrate tolerance, and recyclability over 12 cycles.

Conclusions:

• Functionalized CNTs synergistically activate epoxides at the interfacial layer, boosting PIL catalytic performance.
• CNTs@PIL nanoarchitectures offer a feasible and effective strategy for enhancing metal-free PIL catalysts for CO2 fixation.
• The developed CNT-OH@PIL catalyst presents a promising, sustainable solution for CO2 utilization, even with simulated flue gas.