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Titolo:
Preparation of MFI membranes of enlarged area with high reproducibility
Autore:
Noack, M; Kolsch, P; Schafer, R; Toussaint, P; Sieber, I; Caro, J;
Indirizzi:
Berlin Aldershop EV, Inst Appl Chem, D-12489 Berlin, Germany Berlin Aldershop EV Berlin Germany D-12489 Chem, D-12489 Berlin, Germany Hahn Meitner Inst Berlin GmbH, D-12489 Berlin, Germany Hahn Meitner Inst Berlin GmbH Berlin Germany D-12489 489 Berlin, Germany
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-3, volume: 49, anno: 2001,
pagine: 25 - 37
SICI:
1387-1811(20011115)49:1-3<25:POMMOE>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SILICALITE-1 MEMBRANES; SEPARATION PERFORMANCE; SECONDARY GROWTH; ZSM-5 MEMBRANES; ZEOLITE; FILMS; PERMEATION;
Keywords:
MFI membranes; reproducibility; optimization of synthesis; large area membranes; economical formation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Noack, M Berlin Aldershop EV, Inst Appl Chem, Richard Willstatter Str 12, D-12489 Berlin, Germany Berlin Aldershop EV Richard Willstatter Str 12 Berlin Germany D-12489
Citazione:
M. Noack et al., "Preparation of MFI membranes of enlarged area with high reproducibility", MICROP M M, 49(1-3), 2001, pp. 25-37

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 permeationproperties for industrially interesting mixtures as n-1 iso-alkanes or thexylene isomers. However, so far these membranes are available only with areas of 1-10 cm(2), 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 synthesisconditions. 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 H-2 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. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 22:48:38