Synthesis of MFI-type zeolite membranes on porous α-alumina supports by wet gel crystallization in the vapor phase

Junhang Dong, E. A. Payzant, M. Z C Hu, D. W. Depaoli, Jerry Lin

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A new method has been developed for synthesis of MFI-type zeolite membranes on porous α-alumina supports. Using this method, a thin layer of wet-gel precursor precoated from a synthesis sol containing SiO2, tetrapropylammonium hydroxide (TPAOH), NaOH, and H2O was converted to an MFI zeolite film by vapor-phase treatment at elevated temperatures. MFI zeolite films were formed on the α-alumina substrates, respectively, in the vapor phases of TPAOH solution and an ethylenediamine(EDA)/triethylamine (TEA)/water mixture, but an amorphous material was obtained in the vapor phase of pure water. Scanning electron microscopy and helium permeation examinations before calcination showed that the MFI membrane obtained in the vapor phase of the TPAOH solution was of higher quality than that synthesized in the vapor phase of the EDA/TEA/water mixture in terms of zeolite film integrity and compactness. It was also found that the existence of the template TPA+ in the parental synthesis sol was critical to the formation of MFI zeolite under the investigated conditions. When precursor layers coated from a template-free colloidal silica system were used, the vapor-phase treatment resulted in formation of Na-P1 and ANA zeolite films, respectively, in the vapors of TPAOH solution and the EDA/TEA/water mixture. The method developed in this work has the advantages of improved controllability, minimal waste generation, and reduced chemical consumption that are desirable for large-scale production of zeolite membranes.

Original languageEnglish (US)
Pages (from-to)979-985
Number of pages7
JournalJournal of Materials Science
Volume38
Issue number5
DOIs
StatePublished - Mar 1 2003
Externally publishedYes

Fingerprint

Zeolites
Aluminum Oxide
ethylenediamine
Crystallization
Alumina
Gels
Vapors
Membranes
Water
Polymethyl Methacrylate
Sols
Helium
Controllability
Permeation
Silicon Dioxide
Calcination
Silica
Scanning electron microscopy
hydroxide ion
tetrapropylammonium

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Synthesis of MFI-type zeolite membranes on porous α-alumina supports by wet gel crystallization in the vapor phase. / Dong, Junhang; Payzant, E. A.; Hu, M. Z C; Depaoli, D. W.; Lin, Jerry.

In: Journal of Materials Science, Vol. 38, No. 5, 01.03.2003, p. 979-985.

Research output: Contribution to journalArticle

Dong, Junhang ; Payzant, E. A. ; Hu, M. Z C ; Depaoli, D. W. ; Lin, Jerry. / Synthesis of MFI-type zeolite membranes on porous α-alumina supports by wet gel crystallization in the vapor phase. In: Journal of Materials Science. 2003 ; Vol. 38, No. 5. pp. 979-985.
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