Effects of synthesis parameters on the zeolite membrane growth

The effects of synthesis parameters (i.e. [TEOS], [TPA +], [OH −], dilution and temperature) on the membrane thickness and orientation were investigated for MFI zeolite membranes grown onto seeded supports (i.e. porous glass and alumina). The zeolite crystals grew preferentially with its c-axis alig...

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Bibliographic Details
Published inJournal of membrane science Vol. 191; no. 1; pp. 143 - 163
Main Authors Wong, Wan Cheong, Au, Louisa Tak Yin, Ariso, Carlos Tellez, Yeung, King Lun
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.09.2001
Subjects
Gas permeation
Membrane microstructure
Membrane preparation
MFI zeolite
Silicalite-1
Zeolite membrane
Membrane microstructure
MFI zeolite
Gas permeation
Zeolite membrane
Silicalite-1
Membrane preparation
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Summary:The effects of synthesis parameters (i.e. [TEOS], [TPA +], [OH −], dilution and temperature) on the membrane thickness and orientation were investigated for MFI zeolite membranes grown onto seeded supports (i.e. porous glass and alumina). The zeolite crystals grew preferentially with its c-axis aligned normal to the support surface. This gave the membrane a preferred orientation of (1 0 1) at temperatures below 433 K and an orientation of (0 0 2) at higher temperatures. An empirical model for zeolite membrane growth as a function of synthesis variables was derived based on the experimental data. The model gave an adequate description of the membrane growth and provided an excellent guide for the synthesis of zeolite membranes with engineered microstructure. This model was employed in preparing zeolite membranes of different thickness ( τ=2–8 μm). Helium, argon and sulfur hexaflouride were used as molecular probes for investigating the transport pathways through the membrane microstructure.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(01)00453-7