Abstract
The diffusion of molecular hydrogen adsorbed in zeolite 13X at high coverage's has been studied by quasi-elastic neutron scattering for temperatures ranging from 0 to 60 K. No diffusive motion was observed, within instrumental resolution, at temperatures below 20 K, well above the bulk melting point of H 2 , in contrast to recent NMR studies. The diffusive motion of the adsorbed H 2 could be described by a liquid like jump diffusion model above 35 K. The diffusion coefficient demonstrates an Arrhenius behavior: D = D0 exp(E/kT), with D0 = 1.2 × 10 −8 m 2 /s and an activation energy of E = 62 K. The inelastic scattering spectrum has also been studied. The scattering consisted of several peaks superimposed on a broad background extending from 1 meV to above 100 meV and is consistent with rotational transitions for a hindered rotor in a strong orientational potential with a broad distribution of barrier heights.
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Fu, H., Trouw, F. & Sokol, P.E. A Quasi-Elastic and Inelastic Neutron Scattering Study of H2 in Zeolite. Journal of Low Temperature Physics 116, 149–165 (1999). https://doi.org/10.1023/A:1021881516198
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DOI: https://doi.org/10.1023/A:1021881516198