Separation of CF₄/N₂, C₂F₆/N₂, and SF₆/N₂ Mixtures in Amorphous Activated Carbons Using Molecular Simulations

Area of Science:

• Materials Science
• Chemical Engineering
• Computational Chemistry

Background:

• Separating fluorinated gases (CF4, C2F6, SF6) from nitrogen is crucial but challenging.
• Existing methods for capturing these potent greenhouse gases are often inefficient.
• Development of novel adsorbent materials is needed for effective gas separation.

Purpose of the Study:

• To investigate saccharose coke-based carbons as membranes for adsorbing and separating CF4, C2F6, and SF6 from nitrogen.
• To evaluate the adsorption and diffusion properties of these gases and their mixtures within specific carbon models.
• To assess the performance of these carbon materials for targeted gas purification applications.

Main Methods:

• Utilized advanced Monte Carlo and molecular dynamics simulations.
• Studied adsorption isotherms and heat of adsorption for single components.
• Calculated competitive adsorption, self-diffusivities, corrected diffusivities, and permselectivity.

Main Results:

• Identified CS1000a, an activated amorphous carbon, as a highly efficient adsorbent.
• Quantified adsorption and diffusion behaviors of CF4, C2F6, SF6, and N2 mixtures.
• Demonstrated effective purification of fluorinated adsorbates from nitrogen-based mixtures.

Conclusions:

• Saccharose coke-based carbons, particularly CS1000a, are promising for capturing and separating fluorinated gases.
• Computational simulations provide valuable insights into gas-membrane interactions.
• CS1000a offers an efficient solution for purifying nitrogen streams from fluorinated contaminants.