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

研究成果: Contribution to journalArticle査読

24 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)87-91
ページ数5
ジャーナルChemical Physics Letters
393
1-3
DOI
出版ステータス出版済み - 7 21 2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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