Fabrication of a-oriented Mfi zeolite membrane by secondary growth

Jungkyu Choi, Shubhajit Ghosh, Zhiping Lai, Michael Tsapatsis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Up to now c-, h0h-, and b-oriented MFI membranes have been fabricated by secondary growth [1-7]. While c- and h0h-oriented MFI membranes were achieved by hydrothermal growth of randomly oriented MFI seeds [3-7], the b-oriented MFI membrane was fabricated after secondary growth of a b-oriented mono-layer of MFI seeds [1,2]. We report here an extension of the process that resulted in b-oriented MFI membrane [1, 2] to fabricate thin a-oriented MFI membranes. The process includes a-oriented seed deposition and secondary growth. The characteristic shape of MFI zeolite crystal using as structure directing agent (SDA) trimer-TPA3+3I- (bis-N,N-(tripropylammoniumhexamethylene) di-N,N-propylammonium triiodide) is the b-elongated leaf-shaped crystal with Lc>Lb>La, where Li indicates crystal length along the i-axis [8, 9]. During seed deposition, the extended basal bc-plane and the small thickness along a-axis facilitate the attachment of zeolite seeds with a-out-of-plane orientation. As a result a uniform mono-layer of a-oriented seeds was formed on an a-alumina substrate. After seed deposition hydrothermal growth conditions were identified that resulted in well intergrown a-oriented MFI membranes. We will present detail microstructural characterization of these films along with permeation measurements.

Original languageEnglish (US)
Title of host publication05AIChE
Subtitle of host publication2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
Number of pages1
StatePublished - 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005


Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Country/TerritoryUnited States
CityCincinnati, OH

ASJC Scopus subject areas

  • General Engineering


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