Mobility of hydrogen in microporous silica studied with quasi-elastic neutron scattering

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Benes, Nieck E. and Jobic, Herve and Reat, Valerie and Bouwmeester, Henny J.M. and Verweij, Henk (2003) Mobility of hydrogen in microporous silica studied with quasi-elastic neutron scattering. Separation and Purification Technology, 32 (1-3). pp. 9-15. ISSN 1383-5866

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Abstract:The mobility of H2 in microporous amorphous silica is studied using quasi-elastic neutron scattering. At T=90 K the self-diffusion coefficient is approximately Ds=1.2×10−8 m2 s−1 for low degrees of occupancy (<20%) and decreases slightly to Ds=0.95×10−8 m2 s−1 for an occupancy of 31%. A rough estimate for the energy of activation yields Em=1.4 kJ mol−1. Comparison of the results obtained for silica with those of zeolites indicates a pore size for silica in the range of 4–5 Å.
Item Type:Article
Copyright:Elsevier
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/72226
Official URL:http://dx.doi.org/10.1016/S1383-5866(03)00026-1
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