Sol-gel synthesis of molecular sieving silica membranes

Balagopal N. Nair, Takeo Yamaguchi, Hideo Suematsu, Klaas Keizer, Shin-Ichi Nakao

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Abstract

Polymeric silica sol was synthesized by the acid catalyzed hydrolysis and condensation of tetra-ethyl-ortho-silicate. Calcined unsupported membranes made from this sol showed microporous nature. Supported membranes on alumina were prepared by dipping and calcining. Helium showed activated diffusion with an apparent activation energy of 17 kJ mol−1. H2 permeation was comparable to that of helium under identical conditions. N2, Ar, O2, C3H6, C3H8, n-C4H10 and i-C4H10 permeation values were extremely small and therefore difficult to fit appropriate diffusion models. At 303 K hydrocarbon permeation was about 2 times higher than that of N2, Ar or O2. permselectivity around 1000 and helium permeation in the order of 10−7–10−8 mol m−2 s−1 Pa−1 were measured in the temperature range of 303–460 K. Comparison of Eact, selectivity and He and N2 permeation of different samples evidenced the dependence of nitrogen flux on processing defects. Obviously permeation rate of nitrogen molecule was insignificant through majority pores of the membrane.
Original languageEnglish
Pages (from-to)237-243
Number of pages7
JournalJournal of membrane science
Volume135
Issue number2
DOIs
Publication statusPublished - 1997

Fingerprint

Helium
Polymethyl Methacrylate
Permeation
Silicon Dioxide
Sol-gels
Gels
helium
Silica
gels
silicon dioxide
membranes
Membranes
Nitrogen
synthesis
nitrogen
Silicates
Aluminum Oxide
Sols
Hydrocarbons
dipping

Keywords

  • Ceramic membranes
  • Microporous membranes
  • Gas separations

Cite this

Nair, B. N., Yamaguchi, T., Suematsu, H., Keizer, K., & Nakao, S-I. (1997). Sol-gel synthesis of molecular sieving silica membranes. Journal of membrane science, 135(2), 237-243. https://doi.org/10.1016/S0376-7388(97)00137-3
Nair, Balagopal N. ; Yamaguchi, Takeo ; Suematsu, Hideo ; Keizer, Klaas ; Nakao, Shin-Ichi. / Sol-gel synthesis of molecular sieving silica membranes. In: Journal of membrane science. 1997 ; Vol. 135, No. 2. pp. 237-243.
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Nair, BN, Yamaguchi, T, Suematsu, H, Keizer, K & Nakao, S-I 1997, 'Sol-gel synthesis of molecular sieving silica membranes' Journal of membrane science, vol. 135, no. 2, pp. 237-243. https://doi.org/10.1016/S0376-7388(97)00137-3

Sol-gel synthesis of molecular sieving silica membranes. / Nair, Balagopal N.; Yamaguchi, Takeo; Suematsu, Hideo; Keizer, Klaas; Nakao, Shin-Ichi.

In: Journal of membrane science, Vol. 135, No. 2, 1997, p. 237-243.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Sol-gel synthesis of molecular sieving silica membranes

AU - Nair, Balagopal N.

AU - Yamaguchi, Takeo

AU - Suematsu, Hideo

AU - Keizer, Klaas

AU - Nakao, Shin-Ichi

PY - 1997

Y1 - 1997

N2 - Polymeric silica sol was synthesized by the acid catalyzed hydrolysis and condensation of tetra-ethyl-ortho-silicate. Calcined unsupported membranes made from this sol showed microporous nature. Supported membranes on alumina were prepared by dipping and calcining. Helium showed activated diffusion with an apparent activation energy of 17 kJ mol−1. H2 permeation was comparable to that of helium under identical conditions. N2, Ar, O2, C3H6, C3H8, n-C4H10 and i-C4H10 permeation values were extremely small and therefore difficult to fit appropriate diffusion models. At 303 K hydrocarbon permeation was about 2 times higher than that of N2, Ar or O2. permselectivity around 1000 and helium permeation in the order of 10−7–10−8 mol m−2 s−1 Pa−1 were measured in the temperature range of 303–460 K. Comparison of Eact, selectivity and He and N2 permeation of different samples evidenced the dependence of nitrogen flux on processing defects. Obviously permeation rate of nitrogen molecule was insignificant through majority pores of the membrane.

AB - Polymeric silica sol was synthesized by the acid catalyzed hydrolysis and condensation of tetra-ethyl-ortho-silicate. Calcined unsupported membranes made from this sol showed microporous nature. Supported membranes on alumina were prepared by dipping and calcining. Helium showed activated diffusion with an apparent activation energy of 17 kJ mol−1. H2 permeation was comparable to that of helium under identical conditions. N2, Ar, O2, C3H6, C3H8, n-C4H10 and i-C4H10 permeation values were extremely small and therefore difficult to fit appropriate diffusion models. At 303 K hydrocarbon permeation was about 2 times higher than that of N2, Ar or O2. permselectivity around 1000 and helium permeation in the order of 10−7–10−8 mol m−2 s−1 Pa−1 were measured in the temperature range of 303–460 K. Comparison of Eact, selectivity and He and N2 permeation of different samples evidenced the dependence of nitrogen flux on processing defects. Obviously permeation rate of nitrogen molecule was insignificant through majority pores of the membrane.

KW - Ceramic membranes

KW - Microporous membranes

KW - Gas separations

U2 - 10.1016/S0376-7388(97)00137-3

DO - 10.1016/S0376-7388(97)00137-3

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