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

Nieck Edwin Benes, Herve Jobic, Valerie Reat, Henricus J.M. Bouwmeester, H. Verweij

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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.
Original languageUndefined
Pages (from-to)9-15
Number of pages7
JournalSeparation and purification technology
Issue number1-3
Publication statusPublished - 2003


  • IR-72226
  • METIS-215278

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