CO₂ capture in amine solutions: modelling and simulations with non-empirical methods

Area of Science:

• Chemical Engineering
• Computational Chemistry
• Environmental Science

Background:

• Aqueous amine solutions are the leading technology for carbon dioxide (CO2) capture, but face challenges for large-scale implementation.
• Empirical methods and computational approaches have been used to find optimal solvents, yet deeper chemical understanding is needed.

Purpose of the Study:

• To critically review recent applications of ab initio computer simulations for understanding CO2 capture mechanisms.
• To highlight the impact of structural models and simulation strategies on computational outcomes.
• To emphasize the underappreciated role of water in CO2-amine-water systems.

Main Methods:

• Review of recent computational approaches, specifically ab initio molecular dynamics augmented with metadynamics.
• Analysis of simulation outcomes based on different structural models and reaction simulation strategies.

Main Results:

• Simulation results are highly dependent on the chosen structural models and reaction simulation methods.
• Ab initio molecular dynamics with metadynamics highlights the significant, previously underestimated role of water.
• Water's influence on CO2 capture reactions in amine solutions is crucial for both calculations and experimental data interpretation.

Conclusions:

• A deeper understanding of chemical reactions in solution, particularly the role of water, is essential for advancing CO2 capture technology.
• Current computational approaches need refinement to accurately model these systems.
• Advances in computational methods are necessary for the rational design of improved CO2 capture solvents.