Growth, microstructure, and permeation properties of supported zeolite (MFI) films and membranes prepared by secondary growth

George Xomeritakis, Anastasios Gouzinis, Sankar Nair, Tatsuya Okubo, Mingyan He, Rene M. Overney, Michael Tsapatsis

Research output: Contribution to journalConference articlepeer-review

186 Scopus citations

Abstract

MFI polycrystalline films were prepared on non-porous glass as well as on porous alumina substrates, using secondary growth of seed layers. The secondary growth procedure consists of deposition of MFI microcrystals from a colloidal suspension on the substrate to form seed layers, followed by hydrothermal growth of the seed crystals to form a film. In situ growth was also employed on non-porous substrates that were seed free. The two different growth procedures were compared and it was found that the presence of the seed layers affects film growth and final microstructure. The films upon secondary growth exhibit columnar grain microstructure. Depending on the secondary growth conditions the grains of the polycrystalline films may exhibit c- or [hoh]-out-of-plane orientation. We report single-component and binary permeation measurements using N2, SF6 and butane isomers, for MFI membranes prepared by secondary growth on porous alumina substrates. The N2:SF6 single-component selectivity is 8-10, while the permeation flux of n-C4H10 and the n-C4H10:i-C4H10 flux ratio from 50/50 mixtures at 22°C is in the range 1.5-5.5x10-3 mol m-2 s-1 and 28-62, respectively. The n-C4H10:i-C4H10 flux ratio remains high up to 150°C but decreases drastically at higher temperatures.

Original languageEnglish (US)
Pages (from-to)3521-3531
Number of pages11
JournalChemical Engineering Science
Volume54
Issue number15-16
DOIs
StatePublished - Jul 1 1999
EventProceedings of the 1998 15th International Symposium on Chemical Reaction Engineering, ISCRE 15 - Newport Beach, CA, USA
Duration: Sep 13 1998Sep 16 1998

Keywords

  • Gas permeation
  • Inorganic membrane
  • Seeded growth
  • Silicalite-1
  • Zeolite membrane

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