Synthesis of submicron polycrystalline MFI zeolite films on porous ceramic supports

Junhang Dong, Karsten Wegner, Jerry Lin

Research output: Contribution to journalArticle

76 Scopus citations

Abstract

This paper reports preparation and properties of ultra-thin MFI-type zeolite (silicalite) films on sol-gel derived mesoporous 8 mol% yttria doped zirconia (YZ) supports by the in situ synthesis method. Only non-continuous zeolite films were obtained on the as-synthesized YZ supports (calcined at 450°C). Continuous polycrystalline pure silicalite films, with a thickness of 0.5-0.7 μm, could be grown on the YZ supports pretreated at 700°C. The difference in the oxygen vacancy defect concentrations in these two types of YZ supports is suggested to explain the different results of growing silicalite films. Moreover, defect free 2-3 μm thick silicalite films were also prepared on the α-alumina supports under the same synthesis conditions. The silicalite layer on the YZ support offers a significantly lower mass transfer resistance as compared to that on the alumina support. Single gas permeation data of hydrogen, methane and ethane through these membranes were measured and compared with those of silicalite membranes prepared by other groups. The alumina supported silicalite membranes prepared in this work show better separation factors than the literature values. The zeolite film on the YZ support is less resistant to the stress induced in the step of template removal as compared to the zeolite film on the alumina support.

Original languageEnglish (US)
Pages (from-to)233-241
Number of pages9
JournalJournal of Membrane Science
Volume148
Issue number2
DOIs
Publication statusPublished - Sep 30 1998
Externally publishedYes

    Fingerprint

Keywords

  • Gas and vapor permeation
  • Gas permeation
  • Inorganic membranes
  • Membrane preparation and structure
  • Microporous and porous membranes
  • Silicalite
  • Submicron films
  • Yttria doped zirconia
  • Zeolite membranes

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics

Cite this