Details
Originalsprache | Englisch |
---|---|
Seiten (von - bis) | 25-37 |
Seitenumfang | 13 |
Fachzeitschrift | Microporous and Mesoporous Materials |
Jahrgang | 49 |
Ausgabenummer | 1-3 |
Frühes Online-Datum | 31 Okt. 2001 |
Publikationsstatus | Veröffentlicht - 15 Nov. 2001 |
Extern publiziert | Ja |
Abstract
In the last 10 years extensive work was done in the preparation and characterization of molecular sieve membranes, especially of the types MFI, LTA and FAU. There is a remarkable progress in the synthesis of MFI membranes from the pure silica crystallization system. These silicalite-1 membranes show both separation properties by molecular size exclusion and by molecular interaction because of the hydrophobic interaction of the silica surface with permeating molecules. Silicalite-1 membranes exhibit promising permeation properties for industrially interesting mixtures as n-/ iso-alkanes or the xylene isomers. However, so far these membranes are available only with areas of 1-10 cm2, and the reproducibility of the membrane preparation is unsatisfactory. The yield of high-quality membranes is in the range of 10-30% of the preparations. In this work the membrane area was enlarged by the factor of 30, and the support shape was changed from a flat disc to a tube geometry. This was achieved by the optimization of the synthesis gel composition and the synthesis conditions. Furthermore, by changing the prepared membrane type from a mono- to a polylayer and by varying the calcination conditions, the density and size of leaks could be reduced. As a result of all these measures the yield of high-quality membranes with a minimum permselectivity of H2 to SF6 of 43 (which is five times the Knudsen factor) as a quality criterium was increased to 70% of all preparations. Special attention was given to the economy of the synthesis of MFI membranes which implies to save material, energy and time.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Allgemeine Chemie
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Ingenieurwesen (insg.)
- Werkstoffmechanik
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Microporous and Mesoporous Materials, Jahrgang 49, Nr. 1-3, 15.11.2001, S. 25-37.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Preparation of MFI membranes of enlarged area with high reproducibility
AU - Noack, M.
AU - Kölsch, P.
AU - Schäfer, R.
AU - Toussaint, P.
AU - Sieber, I.
AU - Caro, J.
PY - 2001/11/15
Y1 - 2001/11/15
N2 - In the last 10 years extensive work was done in the preparation and characterization of molecular sieve membranes, especially of the types MFI, LTA and FAU. There is a remarkable progress in the synthesis of MFI membranes from the pure silica crystallization system. These silicalite-1 membranes show both separation properties by molecular size exclusion and by molecular interaction because of the hydrophobic interaction of the silica surface with permeating molecules. Silicalite-1 membranes exhibit promising permeation properties for industrially interesting mixtures as n-/ iso-alkanes or the xylene isomers. However, so far these membranes are available only with areas of 1-10 cm2, and the reproducibility of the membrane preparation is unsatisfactory. The yield of high-quality membranes is in the range of 10-30% of the preparations. In this work the membrane area was enlarged by the factor of 30, and the support shape was changed from a flat disc to a tube geometry. This was achieved by the optimization of the synthesis gel composition and the synthesis conditions. Furthermore, by changing the prepared membrane type from a mono- to a polylayer and by varying the calcination conditions, the density and size of leaks could be reduced. As a result of all these measures the yield of high-quality membranes with a minimum permselectivity of H2 to SF6 of 43 (which is five times the Knudsen factor) as a quality criterium was increased to 70% of all preparations. Special attention was given to the economy of the synthesis of MFI membranes which implies to save material, energy and time.
AB - In the last 10 years extensive work was done in the preparation and characterization of molecular sieve membranes, especially of the types MFI, LTA and FAU. There is a remarkable progress in the synthesis of MFI membranes from the pure silica crystallization system. These silicalite-1 membranes show both separation properties by molecular size exclusion and by molecular interaction because of the hydrophobic interaction of the silica surface with permeating molecules. Silicalite-1 membranes exhibit promising permeation properties for industrially interesting mixtures as n-/ iso-alkanes or the xylene isomers. However, so far these membranes are available only with areas of 1-10 cm2, and the reproducibility of the membrane preparation is unsatisfactory. The yield of high-quality membranes is in the range of 10-30% of the preparations. In this work the membrane area was enlarged by the factor of 30, and the support shape was changed from a flat disc to a tube geometry. This was achieved by the optimization of the synthesis gel composition and the synthesis conditions. Furthermore, by changing the prepared membrane type from a mono- to a polylayer and by varying the calcination conditions, the density and size of leaks could be reduced. As a result of all these measures the yield of high-quality membranes with a minimum permselectivity of H2 to SF6 of 43 (which is five times the Knudsen factor) as a quality criterium was increased to 70% of all preparations. Special attention was given to the economy of the synthesis of MFI membranes which implies to save material, energy and time.
KW - Economical formation
KW - Large area membranes
KW - MFI membranes
KW - Optimization of synthesis
KW - Reproducibility
UR - http://www.scopus.com/inward/record.url?scp=0035498022&partnerID=8YFLogxK
U2 - 10.1016/S1387-1811(01)00396-1
DO - 10.1016/S1387-1811(01)00396-1
M3 - Article
AN - SCOPUS:0035498022
VL - 49
SP - 25
EP - 37
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-3
ER -