Quasi-elastic neutron scattering study of the mobility of methane in microporous silica

Benes, Nieck E. and Jobic, Herve and Verweij, Henk (2001) Quasi-elastic neutron scattering study of the mobility of methane in microporous silica. Microporous and Mesoporous Materials , 43 (2). pp. 147-152. ISSN 1387-1811

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Abstract:	The dynamics of translation and rotation of methane in microporous bulk silica have been studied with quasi-elastic neutron scattering. At T=200 K the self-diffusion coefficient of translation is DS=1.1×10−8 m2 s−1 with an estimated activation energy of 4 kJ mol−1. Any variation of DS with occupancy is within the experimental error of 50%. The isotropic rotational diffusion constant DR is of the order of 1011 s−1, with an experimental error of a factor of 2. The pore-size distribution has been studied with small angle X-ray scattering. A broad pore-size distribution is observed, with pores smaller than 10 Å. The largest fraction of pores is observed at the lower experimental limit, corresponding to a pore size of 2 Å.
Item Type:	Article
Copyright:	Elsevier Science
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Membranes (IM)
Link to this item:	http://purl.utwente.nl/publications/72258
Official URL:	http://dx.doi.org/10.1016/S1387-1811(00)00357-7
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