Transport phenomena through intercrystalline and intracrystalline pathways of silicalite zeolite membranes

Mikihiro Nomura, Takeo Yamaguchi, Shin Ichi Nakao

研究成果: Article

58 引用 (Scopus)

抄録

Zeolite membranes are, generally, polycrystalline structures. Penetrant molecules pass through zeolite crystals (intracrystalline pathways) and intercrystalline pathways. The transport phenomena of ethanol through intracrystalline and intercrystalline pathways of silicalite membranes were separately examined. An intercrystalline-intracrystalline model (i-i model) is proposed for quantitative discussion of fluxes through intercrystalline and intracrystalline pathways. The concentration in the interface of the intracrystalline region is of the Langmuir type, and the concentration in the intercrystalline region is proportional to the activity on the outside of the membrane. This i-i model was investigated using silicalite membranes and silicalite membranes modified by chemical vapor deposition (CVD). CVD modification was carried out using a tetramethylorthosilicate (TMOS)/O3 counter-diffusion CVD technique. The i-i model can quantitatively explain the permeate properties of ethanol transport both through the silicalite membrane and the CVD modified membrane. According to this model, ethanol is permselective from ethanol/water mixtures through intercrystalline pathways.

元の言語English
ページ(範囲)203-212
ページ数10
ジャーナルJournal of Membrane Science
187
発行部数1-2
DOI
出版物ステータスPublished - 2001 6 15
外部発表Yes

Fingerprint

Zeolites
membranes
Membranes
Chemical vapor deposition
Ethanol
ethyl alcohol
vapor deposition
penetrants
counters
Fluxes
Crystals
Molecules
Water
water

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics

これを引用

Transport phenomena through intercrystalline and intracrystalline pathways of silicalite zeolite membranes. / Nomura, Mikihiro; Yamaguchi, Takeo; Nakao, Shin Ichi.

:: Journal of Membrane Science, 巻 187, 番号 1-2, 15.06.2001, p. 203-212.

研究成果: Article

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abstract = "Zeolite membranes are, generally, polycrystalline structures. Penetrant molecules pass through zeolite crystals (intracrystalline pathways) and intercrystalline pathways. The transport phenomena of ethanol through intracrystalline and intercrystalline pathways of silicalite membranes were separately examined. An intercrystalline-intracrystalline model (i-i model) is proposed for quantitative discussion of fluxes through intercrystalline and intracrystalline pathways. The concentration in the interface of the intracrystalline region is of the Langmuir type, and the concentration in the intercrystalline region is proportional to the activity on the outside of the membrane. This i-i model was investigated using silicalite membranes and silicalite membranes modified by chemical vapor deposition (CVD). CVD modification was carried out using a tetramethylorthosilicate (TMOS)/O3 counter-diffusion CVD technique. The i-i model can quantitatively explain the permeate properties of ethanol transport both through the silicalite membrane and the CVD modified membrane. According to this model, ethanol is permselective from ethanol/water mixtures through intercrystalline pathways.",
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AU - Yamaguchi, Takeo

AU - Nakao, Shin Ichi

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Y1 - 2001/6/15

N2 - Zeolite membranes are, generally, polycrystalline structures. Penetrant molecules pass through zeolite crystals (intracrystalline pathways) and intercrystalline pathways. The transport phenomena of ethanol through intracrystalline and intercrystalline pathways of silicalite membranes were separately examined. An intercrystalline-intracrystalline model (i-i model) is proposed for quantitative discussion of fluxes through intercrystalline and intracrystalline pathways. The concentration in the interface of the intracrystalline region is of the Langmuir type, and the concentration in the intercrystalline region is proportional to the activity on the outside of the membrane. This i-i model was investigated using silicalite membranes and silicalite membranes modified by chemical vapor deposition (CVD). CVD modification was carried out using a tetramethylorthosilicate (TMOS)/O3 counter-diffusion CVD technique. The i-i model can quantitatively explain the permeate properties of ethanol transport both through the silicalite membrane and the CVD modified membrane. According to this model, ethanol is permselective from ethanol/water mixtures through intercrystalline pathways.

AB - Zeolite membranes are, generally, polycrystalline structures. Penetrant molecules pass through zeolite crystals (intracrystalline pathways) and intercrystalline pathways. The transport phenomena of ethanol through intracrystalline and intercrystalline pathways of silicalite membranes were separately examined. An intercrystalline-intracrystalline model (i-i model) is proposed for quantitative discussion of fluxes through intercrystalline and intracrystalline pathways. The concentration in the interface of the intracrystalline region is of the Langmuir type, and the concentration in the intercrystalline region is proportional to the activity on the outside of the membrane. This i-i model was investigated using silicalite membranes and silicalite membranes modified by chemical vapor deposition (CVD). CVD modification was carried out using a tetramethylorthosilicate (TMOS)/O3 counter-diffusion CVD technique. The i-i model can quantitatively explain the permeate properties of ethanol transport both through the silicalite membrane and the CVD modified membrane. According to this model, ethanol is permselective from ethanol/water mixtures through intercrystalline pathways.

KW - Dual-sorption model

KW - Inorganic membranes

KW - Intercrystalline-intracrystalline

KW - Microporous and porous membranes

KW - Silicalite membranes

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