Dependence of the diffusion coefficients of methane in silicalite on diffusion distance as investigated by 1H PFG NMR

Hiromitsu Takaba, Atsushi Yamamoto, Kikuko Hayamizu, Yasunori Oumi, Tsuneji Sano, Etsuo Akiba, Shin Ichi Nakao

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

1H PFG NMR was performed to measure the diffusion coefficient of methane in three MFI-type siliceous zeolite silicalite samples, which were synthesized under different hydrothermal conditions resulting in different crystal sizes or intracrystalline defects. Measured diffusivities of methane decreased at the diffusion distance around 7 μm for all samples. The distance almost corresponds with the distance between cracks in the intracrystalline. However, the well-calcined sample, which has no detectable cracks as observed by scanning electron microscope, also showed a drastic decrease in the diffusion coefficient. This result suggests the existence of an intracrystalline transport barrier in the single crystal, the size of which is below the SEM resolution.

Original languageEnglish
Pages (from-to)87-91
Number of pages5
JournalChemical Physics Letters
Volume393
Issue number1-3
DOIs
Publication statusPublished - Jul 21 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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