Carbon molecular sieve membranes prepared from porous fiber precursor

J.N. Barsema, N.F.A. van der Vegt, G.H. Koops, Matthias Wessling

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Carbon molecular sieve (CMS) membranes are usually prepared from dense polymeric precursors that already show intrinsic gas separation properties. The rationale behind this approach is that the occurrence of any kind of initial porosity will deteriorate the final CMS performance. We will show that it is not necessary to produce a non-porous precursor in order to obtain a selective CMS membrane. We used tight ultra-filtration (UF) fiber membranes as a precursor. These fibers did not have any gas separation properties before the pyrolysis treatment, nor were coatings applied to these fibers before or subsequent to the pyrolysis. After a heat treatment in air followed by a pyrolysis in a nitrogen atmosphere CMS fiber membranes were obtained. The CMS fibers were analyzed using scanning electron microscopy, thermo gravimetrical analysis, and gas permeation. From the permeation rates and permselectivity values measured for He, H2, CO2, Ar, O2, N2, CH4, C2H4, C2H6, C3H6, C3H8 and SF6 the evolution of the mean pore diameter was investigated. It was found that the pore diameter increases with pyrolysis temperature up to 800 °C, but decreases as the temperature is raised to 900 °C. The overall porosity reaches its highest value at 900 °C.
Original languageUndefined
Pages (from-to)239-246
JournalJournal of membrane science
Volume205
Issue number1-2
DOIs
Publication statusPublished - 2002

Keywords

  • METIS-209110
  • IR-38156

Cite this

Barsema, J.N. ; van der Vegt, N.F.A. ; Koops, G.H. ; Wessling, Matthias. / Carbon molecular sieve membranes prepared from porous fiber precursor. In: Journal of membrane science. 2002 ; Vol. 205, No. 1-2. pp. 239-246.
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abstract = "Carbon molecular sieve (CMS) membranes are usually prepared from dense polymeric precursors that already show intrinsic gas separation properties. The rationale behind this approach is that the occurrence of any kind of initial porosity will deteriorate the final CMS performance. We will show that it is not necessary to produce a non-porous precursor in order to obtain a selective CMS membrane. We used tight ultra-filtration (UF) fiber membranes as a precursor. These fibers did not have any gas separation properties before the pyrolysis treatment, nor were coatings applied to these fibers before or subsequent to the pyrolysis. After a heat treatment in air followed by a pyrolysis in a nitrogen atmosphere CMS fiber membranes were obtained. The CMS fibers were analyzed using scanning electron microscopy, thermo gravimetrical analysis, and gas permeation. From the permeation rates and permselectivity values measured for He, H2, CO2, Ar, O2, N2, CH4, C2H4, C2H6, C3H6, C3H8 and SF6 the evolution of the mean pore diameter was investigated. It was found that the pore diameter increases with pyrolysis temperature up to 800 °C, but decreases as the temperature is raised to 900 °C. The overall porosity reaches its highest value at 900 °C.",
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Carbon molecular sieve membranes prepared from porous fiber precursor. / Barsema, J.N.; van der Vegt, N.F.A.; Koops, G.H.; Wessling, Matthias.

In: Journal of membrane science, Vol. 205, No. 1-2, 2002, p. 239-246.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Carbon molecular sieve membranes prepared from porous fiber precursor

AU - Barsema, J.N.

AU - van der Vegt, N.F.A.

AU - Koops, G.H.

AU - Wessling, Matthias

PY - 2002

Y1 - 2002

N2 - Carbon molecular sieve (CMS) membranes are usually prepared from dense polymeric precursors that already show intrinsic gas separation properties. The rationale behind this approach is that the occurrence of any kind of initial porosity will deteriorate the final CMS performance. We will show that it is not necessary to produce a non-porous precursor in order to obtain a selective CMS membrane. We used tight ultra-filtration (UF) fiber membranes as a precursor. These fibers did not have any gas separation properties before the pyrolysis treatment, nor were coatings applied to these fibers before or subsequent to the pyrolysis. After a heat treatment in air followed by a pyrolysis in a nitrogen atmosphere CMS fiber membranes were obtained. The CMS fibers were analyzed using scanning electron microscopy, thermo gravimetrical analysis, and gas permeation. From the permeation rates and permselectivity values measured for He, H2, CO2, Ar, O2, N2, CH4, C2H4, C2H6, C3H6, C3H8 and SF6 the evolution of the mean pore diameter was investigated. It was found that the pore diameter increases with pyrolysis temperature up to 800 °C, but decreases as the temperature is raised to 900 °C. The overall porosity reaches its highest value at 900 °C.

AB - Carbon molecular sieve (CMS) membranes are usually prepared from dense polymeric precursors that already show intrinsic gas separation properties. The rationale behind this approach is that the occurrence of any kind of initial porosity will deteriorate the final CMS performance. We will show that it is not necessary to produce a non-porous precursor in order to obtain a selective CMS membrane. We used tight ultra-filtration (UF) fiber membranes as a precursor. These fibers did not have any gas separation properties before the pyrolysis treatment, nor were coatings applied to these fibers before or subsequent to the pyrolysis. After a heat treatment in air followed by a pyrolysis in a nitrogen atmosphere CMS fiber membranes were obtained. The CMS fibers were analyzed using scanning electron microscopy, thermo gravimetrical analysis, and gas permeation. From the permeation rates and permselectivity values measured for He, H2, CO2, Ar, O2, N2, CH4, C2H4, C2H6, C3H6, C3H8 and SF6 the evolution of the mean pore diameter was investigated. It was found that the pore diameter increases with pyrolysis temperature up to 800 °C, but decreases as the temperature is raised to 900 °C. The overall porosity reaches its highest value at 900 °C.

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KW - IR-38156

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DO - 10.1016/S0376-7388(02)00117-5

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