Hydrogen storage in sH hydrates: a Monte Carlo study

Area of Science:

• Materials Science
• Chemical Engineering
• Physical Chemistry

Background:

• Hydrogen hydrates, particularly the sH type, are a novel class of materials with potential for gas storage.
• Understanding their hydrogen storage capacity is crucial for developing advanced energy solutions.

Purpose of the Study:

• To evaluate the hydrogen storage capacity of sH-type hydrates under varying conditions.
• To determine the influence of promoter molecules on hydrogen uptake in these hydrates.

Main Methods:

• Grand canonical Monte Carlo simulations were employed to model hydrogen storage.
• Simulations were conducted at 274 K and pressures up to 500 MPa.
• Both pure H2 and binary H2-methylcyclohexane sH hydrates were investigated.

Main Results:

• Pure H2 sH hydrates can achieve up to 3.6 wt% hydrogen storage capacity at 500 MPa.
• The large cavities accommodate multiple H2 molecules, while smaller cavities are singly occupied.
• Binary H2-methylcyclohexane sH hydrates show a maximum H2 uptake of 1.4 wt%.

Conclusions:

• sH-type hydrates demonstrate significant potential for hydrogen storage applications.
• The occupancy of cavities and the presence of promoter molecules influence storage capacity.
• Further research into sH hydrates with promoters in medium cavities is warranted.