Phase equilibria molecular simulations of hydrogen hydrates via the direct phase coexistence approach

We report the three-phase (hydrate-liquid water-vapor) equilibrium conditions of the hydrogen-water binary system calculated with molecular dynamics simulations via the direct phase coexistence approach. A significant improvement of similar to 10.5 K is obtained in the current study, over earlier simulation attempts, by using a combination of modifications related to the hydrogen model that include (i) hydrogen Lennard-Jones parameters that are a function of temperature and (ii) the water-guest energy interaction parameters optimized further by using the Lorentz-Berthelot combining rules, based on an improved description of the solubility of hydrogen in water. Published under an exclusive license by AIP Publishing.

Automated summary

We report the three-phase equilibrium conditions of the hydrogen-water binary system calculated with molecular dynamics simulations, achieving a significant improvement over earlier attempts through modifications in the hydrogen model and the optimization of water-guest energy interaction parameters.