Details
| Original language | English |
|---|---|
| Pages (from-to) | 55-61 |
| Number of pages | 7 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 98 |
| Issue number | 1-3 |
| Early online date | 2 Oct 2006 |
| Publication status | Published - 5 Jan 2007 |
Abstract
The permeation properties of bi-layered Al-ZSM-5/Silicalite-1 membranes were studied using nitrogen/n-hexane permporosimetry, hydrogen/sulphur hexafluoride single gas permeation/mixture separation and n/i-pentane and p/o-xylene mixture separation. At 25 °C and in the 200 kPa feed-t-100 kPa permeate permeation mode hydrogen/sulphur hexafluoride permselectivities increased with the Al-ZSM-5 layer and decreased with the Silicalite-1 layer thickness. This behaviour was not related to defects but rather to different molecular interactions according to the chemical compositions of the membranes. Differences in hydrogen/sulphur hexafluoride permselectivities and separation factors were not as pronounced in most of the membranes for permeation measurements at 105 °C and in the 100-to-1 kPa permeation mode. The membranes composed of Al-ZSM-5 on Silicalite-1 layers were of better quality than membranes with the reverse order of layers according to permporosimetry measurements. The best membrane of this type had a hydrogen/sulphur hexafluoride ideal permselectivity and mixture separation factor of 210 and 97, respectively, at 105 °C. It achieved separation factors of 8 and 5 for the separation of 1:1 mixtures of n/i-pentane and p/o-xylene, respectively. All membranes deteriorated in quality after calcination at temperatures ≥ 450 °C in air in comparison to the initial calcination at 400 °C in a nitrogen atmosphere with trace amounts of air.
Keywords
- Bi-layered membrane, MFI membrane, Mixture separation, Single gas permeation, Stainless steel support
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. 98, No. 1-3, 05.01.2007, p. 55-61.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Permeation properties of bi-layered Al-ZSM-5/Silicalite-1 membranes
AU - Mabande, G. T.P.
AU - Noack, M.
AU - Avhale, A.
AU - Kölsch, P.
AU - Georgi, G.
AU - Schwieger, W.
AU - Caro, J.
PY - 2007/1/5
Y1 - 2007/1/5
N2 - The permeation properties of bi-layered Al-ZSM-5/Silicalite-1 membranes were studied using nitrogen/n-hexane permporosimetry, hydrogen/sulphur hexafluoride single gas permeation/mixture separation and n/i-pentane and p/o-xylene mixture separation. At 25 °C and in the 200 kPa feed-t-100 kPa permeate permeation mode hydrogen/sulphur hexafluoride permselectivities increased with the Al-ZSM-5 layer and decreased with the Silicalite-1 layer thickness. This behaviour was not related to defects but rather to different molecular interactions according to the chemical compositions of the membranes. Differences in hydrogen/sulphur hexafluoride permselectivities and separation factors were not as pronounced in most of the membranes for permeation measurements at 105 °C and in the 100-to-1 kPa permeation mode. The membranes composed of Al-ZSM-5 on Silicalite-1 layers were of better quality than membranes with the reverse order of layers according to permporosimetry measurements. The best membrane of this type had a hydrogen/sulphur hexafluoride ideal permselectivity and mixture separation factor of 210 and 97, respectively, at 105 °C. It achieved separation factors of 8 and 5 for the separation of 1:1 mixtures of n/i-pentane and p/o-xylene, respectively. All membranes deteriorated in quality after calcination at temperatures ≥ 450 °C in air in comparison to the initial calcination at 400 °C in a nitrogen atmosphere with trace amounts of air.
AB - The permeation properties of bi-layered Al-ZSM-5/Silicalite-1 membranes were studied using nitrogen/n-hexane permporosimetry, hydrogen/sulphur hexafluoride single gas permeation/mixture separation and n/i-pentane and p/o-xylene mixture separation. At 25 °C and in the 200 kPa feed-t-100 kPa permeate permeation mode hydrogen/sulphur hexafluoride permselectivities increased with the Al-ZSM-5 layer and decreased with the Silicalite-1 layer thickness. This behaviour was not related to defects but rather to different molecular interactions according to the chemical compositions of the membranes. Differences in hydrogen/sulphur hexafluoride permselectivities and separation factors were not as pronounced in most of the membranes for permeation measurements at 105 °C and in the 100-to-1 kPa permeation mode. The membranes composed of Al-ZSM-5 on Silicalite-1 layers were of better quality than membranes with the reverse order of layers according to permporosimetry measurements. The best membrane of this type had a hydrogen/sulphur hexafluoride ideal permselectivity and mixture separation factor of 210 and 97, respectively, at 105 °C. It achieved separation factors of 8 and 5 for the separation of 1:1 mixtures of n/i-pentane and p/o-xylene, respectively. All membranes deteriorated in quality after calcination at temperatures ≥ 450 °C in air in comparison to the initial calcination at 400 °C in a nitrogen atmosphere with trace amounts of air.
KW - Bi-layered membrane
KW - MFI membrane
KW - Mixture separation
KW - Single gas permeation
KW - Stainless steel support
UR - http://www.scopus.com/inward/record.url?scp=33845325210&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2006.04.019
DO - 10.1016/j.micromeso.2006.04.019
M3 - Article
AN - SCOPUS:33845325210
VL - 98
SP - 55
EP - 61
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-3
ER -