Diffusive hydrogen inter-cage migration in hydrogen and hydrogen-tetrahydrofuran clathrate hydrates

Classical equilibrium molecular dynamics simulations have been performed to investigate the diffusive properties of inter-cage hydrogen migration in both pure hydrogen and mixed hydrogen-tetrahydrofuran sII hydrates at 0.05 kbar from 200 K and up to 250-260 K. For mixed H-2-THF systems in which there is single H-2 occupation of the small cage (labelled 1S1L), we found that no H-2 migration occurs. However, for more densely filled H-2-THF and pure-H-2 systems, in which there is more than single H-2 occupation in the small cage, there is an onset of inter-cage H-2 migration events from the small cages to neighbouring cavities at around 200 K. The mean square displacements of the hydrogen molecules were fitted to a mathematical model consisting of an anomalous term and a Fickian component, and nonlinear regression fitting was conducted to estimate long-time (inter-cage) diffusivities. An approximate Arrhenius temperature relationship for the diffusion coefficient was examined and an estimation of the hydrogen hopping energy barrier was calculated for each system. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793468]