CO2 Hydrate Formation Promoted by a Natural Amino Acid l-Methionine for Possible Application to CO2 Capture and Storage

We demonstrate that l -methionine, a natural amino acid, can be used to dramatically enhance CO 2 uptake kinetics in the formation of CO 2 hydrate without the use of energy-intensive mixing technologies or environmentally harmful chemicals. To the best of our knowledge, l -methionine is the most effective promoter to enhance CO 2 hydrate formation (at a concentration of 0.2 wt %, the gravimetric capacity reached up to 356 mg g −1 in 1000 min, and t 90 (the time to achieve 90 % of this capacity) was only 15 min). We also present a tentative explanation for the promotion mechanism of l -methionine in the formation of CO 2 hydrate from the point of view of structure–property relationship that will help search for more effective promoters. Our results may offer the possibility of practical application of hydrate-based CO 2 capture and storage technology.