Capturing carbon dioxide as a polymer from natural gas.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Natural gas extraction yields significant amounts of carbon dioxide (CO2), often vented to the atmosphere.
• Current methods for CO2 containment at well-heads are costly and can be corrosive.
• There is a need for efficient, inexpensive, and non-corrosive CO2 capture technologies.

Purpose of the Study:

• To synthesize inexpensive and non-corrosive porous carbon materials for CO2 capture.
• To investigate the mechanism of CO2 fixation and polymerization within the carbon structure.
• To develop a regenerable sorbent for CO2 removal from natural gas.

Main Methods:

• Synthesis of nucleophilic porous carbons from carbon-sulfur and carbon-nitrogen precursors.
• Characterization using Infrared (IR), Raman, and (13)C nuclear magnetic resonance (NMR) spectroscopy.
• Evaluation of CO2 fixation, polymerization, and sorbent regeneration under varying conditions.

Main Results:

• Successfully synthesized porous carbons capable of capturing CO2 via polymerization to poly(CO2) within carbon channels.
• CO2 fixation occurred at lower pressures than previously required, initiated by chemisorbed sulfur or nitrogen atoms.
• The poly(CO2) spontaneously depolymerized at ambient conditions, allowing for facile sorbent regeneration without thermal input.

Conclusions:

• Novel porous carbons offer an inexpensive and effective method for CO2 capture from natural gas.
• The chemisorption-initiated polymerization mechanism enables efficient CO2 fixation and selective hydrocarbon displacement.
• The spontaneous depolymerization allows for energy-efficient regeneration, presenting a sustainable solution for carbon capture.