Polymer-MOF Network Enabling Ultrathin Coating for Post-Combustion Carbon Capture.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Developing membranes for post-combustion carbon capture faces challenges with permeance-selectivity trade-offs and high-temperature performance.
• Mixed matrix membranes (MMMs) using polymers and metal-organic frameworks (MOFs) show promise but are limited by low MOF loading in thin films.

Purpose of the Study:

• To develop a novel inverse synthesis strategy for creating polymer-MOF networks with high MOF loading.
• To fabricate and evaluate defect-free, thin polymer-MOF composite membranes for efficient carbon capture applications.

Main Methods:

• An inverse synthesis strategy was employed, copolymerizing monomers with functionalized UiO-66 nanoparticles to form polymer-MOF networks.
• Defect-free, thin polymer-MOF coatings (up to 40 wt% MOF loading) were achieved within polyethylene oxide-based polymers on polyacrylonitrile supports.

Main Results:

• The membrane with 40 wt% MOF exhibited a 212% increase in CO2 permeance at 25°C and maintained a selectivity of 20 at 60°C.
• Under mixed gas conditions with 83% relative humidity at 60°C, the membrane achieved a CO2 permeance of 2793 GPU and a CO2/N2 selectivity of 21.6.

Conclusions:

• The developed polymer-MOF membranes demonstrate excellent performance for carbon capture, overcoming limitations of traditional MMMs.
• This inverse synthesis approach offers a pathway for energy-efficient flue gas carbon capture and potential for other applications.