Details
| Original language | English |
|---|---|
| Pages (from-to) | 253-265 |
| Number of pages | 13 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 35-36 |
| Early online date | 6 Apr 2000 |
| Publication status | Published - Apr 2000 |
| Externally published | Yes |
Abstract
For pervaporation and steam permeation, in one- and two-step crystallizations, respectively, two kinds of MFI membranes of different SiO2/Al2O3 ratio on a mesoporous alumina ceramic support have been prepared. In the one-step crystallization, using TPA-OH as template, a supported silicalite membrane was obtained by in situ crystallization. In the two-step crystallization, by first attaching seed crystals to the ceramic surface with electrostatic forces and then crystallizing a continuous MFI layer in a template-free synthesis, a ZSM-5 membrane was prepared. The membranes have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) in combination with electron dispersive X-ray (EDX) line scan as well as by single gas and binary mixture permeation. In pervaporation and steam permeation measurements of water/iso-propanol and water/methanol mixtures, the silicalite membrane showed a hydrophobic and the ZSM-5 membrane a hydrophilic separation behavior. However, only the silicalite membrane obtained by one-step crystallization allows shape selective permeation such as the separation of n/isobutane and methanol/MTBE mixtures. In the case of the polycrystalline ZSM-5 membrane with columnar microstructure, a superposition of mass transport through the crystal boundaries and the crystals takes place. (C) 2000 Elsevier Science B.V. All rights reserved.
Keywords
- Binary mixtures, Permeation, Pervaporation, Silicalite membrane, ZSM-5 membrane
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 35-36, 04.2000, p. 253-265.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - MFI membranes of different Si/Al ratios for pervaporation and steam permeation
AU - Noack, M.
AU - Kölsch, P.
AU - Caro, J.
AU - Schneider, M.
AU - Toussaint, P.
AU - Sieber, I.
PY - 2000/4
Y1 - 2000/4
N2 - For pervaporation and steam permeation, in one- and two-step crystallizations, respectively, two kinds of MFI membranes of different SiO2/Al2O3 ratio on a mesoporous alumina ceramic support have been prepared. In the one-step crystallization, using TPA-OH as template, a supported silicalite membrane was obtained by in situ crystallization. In the two-step crystallization, by first attaching seed crystals to the ceramic surface with electrostatic forces and then crystallizing a continuous MFI layer in a template-free synthesis, a ZSM-5 membrane was prepared. The membranes have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) in combination with electron dispersive X-ray (EDX) line scan as well as by single gas and binary mixture permeation. In pervaporation and steam permeation measurements of water/iso-propanol and water/methanol mixtures, the silicalite membrane showed a hydrophobic and the ZSM-5 membrane a hydrophilic separation behavior. However, only the silicalite membrane obtained by one-step crystallization allows shape selective permeation such as the separation of n/isobutane and methanol/MTBE mixtures. In the case of the polycrystalline ZSM-5 membrane with columnar microstructure, a superposition of mass transport through the crystal boundaries and the crystals takes place. (C) 2000 Elsevier Science B.V. All rights reserved.
AB - For pervaporation and steam permeation, in one- and two-step crystallizations, respectively, two kinds of MFI membranes of different SiO2/Al2O3 ratio on a mesoporous alumina ceramic support have been prepared. In the one-step crystallization, using TPA-OH as template, a supported silicalite membrane was obtained by in situ crystallization. In the two-step crystallization, by first attaching seed crystals to the ceramic surface with electrostatic forces and then crystallizing a continuous MFI layer in a template-free synthesis, a ZSM-5 membrane was prepared. The membranes have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) in combination with electron dispersive X-ray (EDX) line scan as well as by single gas and binary mixture permeation. In pervaporation and steam permeation measurements of water/iso-propanol and water/methanol mixtures, the silicalite membrane showed a hydrophobic and the ZSM-5 membrane a hydrophilic separation behavior. However, only the silicalite membrane obtained by one-step crystallization allows shape selective permeation such as the separation of n/isobutane and methanol/MTBE mixtures. In the case of the polycrystalline ZSM-5 membrane with columnar microstructure, a superposition of mass transport through the crystal boundaries and the crystals takes place. (C) 2000 Elsevier Science B.V. All rights reserved.
KW - Binary mixtures
KW - Permeation
KW - Pervaporation
KW - Silicalite membrane
KW - ZSM-5 membrane
UR - http://www.scopus.com/inward/record.url?scp=0033627505&partnerID=8YFLogxK
U2 - 10.1016/S1387-1811(99)00226-7
DO - 10.1016/S1387-1811(99)00226-7
M3 - Article
AN - SCOPUS:0033627505
VL - 35-36
SP - 253
EP - 265
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
ER -