Enhancing Potassium Carbonate for CO₂-Capture with Novel Green Promoters: Mechanisms and Challenges
DOI:
https://doi.org/10.65204/djes.v3i2.580Keywords:
CO2 Capture , Absorption, Amine groups, Green promoters, Mechanism of Promoter SystemAbstract
Potassium carbonate solvent (K2CO3) is an established solvent for CO2-capture due to thermal stability and lower energy requirements for regeneration compared to conventional amines. However, it's limited intrinsically by notoriously slow absorption kinetics. This review presents three new promoters including task-specific ionic liquids (TSILs), task-specific deep eutectic solvents (TASK-DESs), and amine-amino-acid salts (AAAS) to overcome this kinetic limitation. The current proposition for these promoters is mainly based on their high performance as individual, standalone solvents which shows enhanced capacities and reversible chemisorption pathways. Each class has a different compromise between kinetic enhancement, viscosity, cost and stability. TSILs offer excellent tunability and low-volatility at a high cost and viscosity. TASK-DESs provide a greener and simpler synthesis route but have a high viscosity issue due to hydrogen bond networks. AAAS are especially promising because of their fast kinetics their ionic character (reducing volatility) as well as precipitation resistance and lower regeneration energy. This review concludes by identifying key research gaps and future opportunities focused on the rational molecular design of promoters, understanding synergistic effects in carbonate matrices, and conducting an integrated process validation to achieve the full potential of promoter-enhanced K2CO3 technology for scalable carbon capture.
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