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Article Dans Une Revue Zeolites Année : 1992

Dynamics of ethane and propane in zeolite ZSM-5 studied by quasi-elastic neutron scattering

Hervé Jobic
Gordon Kearley
  • Fonction : Auteur

Résumé

Quasi-elastic neutron scattering has been used to study the dynamics of ethane and propane in zeolite ZSM-5. The experiments were performed at different loadings for the two alkanes and at different temperatures for propane. The long-range translational motion of the molecules has been observed and has been interpreted with a jump diffusion model, the mean jump lengths being of the order of 10 Å, slightly decreasing with increasing loading. The self-diffusion coefficients of ethane are about 2 × 10−9 m2 s−1 at 300 K, those of propane at the same temperature being smaller by a factor of two. An activation energy of 5 kJ mol−1 is obtained for the self-diffusion of propane. These results are in good agreement with the pulsed-field gradient n.m.r. measurements. In addition to the translational motion, a rotational motion of the two molecules is also observed; it is described by an uniaxial rotational diffusion model and rotational diffusion constants are derived.

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hal-00006264 , version 1 (10-01-2022)

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Paternité - Pas d'utilisation commerciale

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Hervé Jobic, Marc Bee, Gordon Kearley. Dynamics of ethane and propane in zeolite ZSM-5 studied by quasi-elastic neutron scattering. Zeolites, 1992, 12, pp.146-151. ⟨10.1016/0144-2449(92)90075-Z⟩. ⟨hal-00006264⟩

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