Explicating the amino acid effects for methane storage in hydrate form

Area of Science:

• Environmental Science
• Chemical Engineering
• Materials Science

Background:

• Methane emissions significantly contribute to global temperature rise.
• Capturing methane at the source is crucial for climate change mitigation.
• Methane hydrate formation presents a promising method for gas capture.

Purpose of the Study:

• To investigate the efficacy of various amino acids in methane hydrate formation.
• To evaluate the impact of amino acid structure on methane capture and storage.
• To identify suitable amino acids for practical methane gas capture applications.

Main Methods:

• Experimental study of methane hydrate formation in the presence of different amino acids.
• Measurement of formation temperatures, subcooling requirements, and methane conversion rates.
• Analysis of gas uptake kinetics and the influence of amino acid side chains.

Main Results:

• Amino acids influenced methane hydrate formation temperatures, with most forming hydrates between 268-273 K.
• Subcooling requirements varied, increasing in the order l-thr > l-met > l-phe > l-val > l-cys.
• High methane conversion (80-85%) was observed with l-met, l-phe, l-cys, and l-val, but only 30% with l-thr.
• Faster gas uptake kinetics were noted for l-met and l-phe systems.

Conclusions:

• Amino acids, particularly l-met, l-phe, l-cys, and l-val, are effective materials for methane capture and storage via hydrate formation.
• The hydroxyl group in l-thr increases hydrophilicity, reducing its efficiency for methane capture.
• Amino acids offer a viable, water-soluble, and pelletizable solution for methane gas storage and transportation.