Details
| Original language | English |
|---|---|
| Pages (from-to) | 263-273 |
| Number of pages | 11 |
| Journal | Journal of membrane science |
| Volume | 159 |
| Issue number | 1-2 |
| Early online date | 2 Jun 1999 |
| Publication status | Published - 1 Jul 1999 |
| Externally published | Yes |
Abstract
Porous α-alumina supports were seeded with colloidal TPA-silicalite-1 crystals and calcined. The supports were treated in a synthesis solution to grow the seed crystals into ZSM-5 films. The synthesis solution was free from organic template molecules in order to avoid the calcination step which often introduces cracks in the synthesized zeolite film. An SEM investigation indicated that the zeolite films on the supports were defect free and that the film thickness was approximately 1.5μm. XRD data showed that the film consisted of well-crystallized ZSM-5. The permeance in single gas experiments decreased in the order H2O, H2, CO2, O2, N2 and CH4. The difference in permeance between each molecular species in the series was almost one order of magnitude which indicated that the membranes were of a high quality. Molecules larger than CH4 permeated with similar and low rates, independent of their kinetic diameters, indicating a non-selective permeation path through defects in the zeolite films. However, the permeance of these larger molecules was less than 1/10 000 of that for H2O. The highest measured separation factors for binary mixtures of N2/SF6 and H2/i-C4 were 110 and 99. Copyright (C) 1999 Elsevier Science B.V.
Keywords
- Membrane, Microporous, Molecular sieve, Zeolite
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- General Materials Science
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 159, No. 1-2, 01.07.1999, p. 263-273.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - ZSM-5 membranes synthesized without organic templates using a seeding technique
AU - Hedlund, J.
AU - Noack, M.
AU - Kölsch, P.
AU - Creaser, D.
AU - Caro, J.
AU - Sterte, J.
PY - 1999/7/1
Y1 - 1999/7/1
N2 - Porous α-alumina supports were seeded with colloidal TPA-silicalite-1 crystals and calcined. The supports were treated in a synthesis solution to grow the seed crystals into ZSM-5 films. The synthesis solution was free from organic template molecules in order to avoid the calcination step which often introduces cracks in the synthesized zeolite film. An SEM investigation indicated that the zeolite films on the supports were defect free and that the film thickness was approximately 1.5μm. XRD data showed that the film consisted of well-crystallized ZSM-5. The permeance in single gas experiments decreased in the order H2O, H2, CO2, O2, N2 and CH4. The difference in permeance between each molecular species in the series was almost one order of magnitude which indicated that the membranes were of a high quality. Molecules larger than CH4 permeated with similar and low rates, independent of their kinetic diameters, indicating a non-selective permeation path through defects in the zeolite films. However, the permeance of these larger molecules was less than 1/10 000 of that for H2O. The highest measured separation factors for binary mixtures of N2/SF6 and H2/i-C4 were 110 and 99. Copyright (C) 1999 Elsevier Science B.V.
AB - Porous α-alumina supports were seeded with colloidal TPA-silicalite-1 crystals and calcined. The supports were treated in a synthesis solution to grow the seed crystals into ZSM-5 films. The synthesis solution was free from organic template molecules in order to avoid the calcination step which often introduces cracks in the synthesized zeolite film. An SEM investigation indicated that the zeolite films on the supports were defect free and that the film thickness was approximately 1.5μm. XRD data showed that the film consisted of well-crystallized ZSM-5. The permeance in single gas experiments decreased in the order H2O, H2, CO2, O2, N2 and CH4. The difference in permeance between each molecular species in the series was almost one order of magnitude which indicated that the membranes were of a high quality. Molecules larger than CH4 permeated with similar and low rates, independent of their kinetic diameters, indicating a non-selective permeation path through defects in the zeolite films. However, the permeance of these larger molecules was less than 1/10 000 of that for H2O. The highest measured separation factors for binary mixtures of N2/SF6 and H2/i-C4 were 110 and 99. Copyright (C) 1999 Elsevier Science B.V.
KW - Membrane
KW - Microporous
KW - Molecular sieve
KW - Zeolite
UR - http://www.scopus.com/inward/record.url?scp=0033013453&partnerID=8YFLogxK
U2 - 10.1016/S0376-7388(99)00069-1
DO - 10.1016/S0376-7388(99)00069-1
M3 - Article
AN - SCOPUS:0033013453
VL - 159
SP - 263
EP - 273
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
IS - 1-2
ER -