Ceramic zeolite composite membranes. Preparation, characterization and gas permeation

Meng Dong Jia, Klaus-Victor Georg Peinemann*, Rolf Dieter Behling

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Scopus citations

Abstract

Ceramic zeolite composite membranes, comprising a ceramic substrate and a dense pure zeolite thin layer on the surface of the substrate, have been developed by in-situ synthesis. The zeolite thin layer has been shown by X-ray diffraction, SEM and optical microscopy to have a pure zeolite phase, in which individual zeolite crystallites have intergrown in three dimensions into a polycrystal zeolite thin disc. The nitrogen permeability of these composite membranes, after calcination, reaches 1-4 m3/m2-hr-bar at room temperature. The ideal selectivities are 2.81 for He over N2 and 47.7 for N2 over n-butane, which are far beyond the range of Knudsen diffusion. After improvement of the preparation procedure the membrane even shows a selectivity of 6.2 for n-butane over i-butane. Combined effects of "shape-selectivity" of the zeolite and capillary condensation of the non-zeolite pores are considered to be responsible for the high selectivities.

Original languageEnglish (US)
Pages (from-to)15-26
Number of pages12
JournalJournal of Membrane Science
Volume82
Issue number1-2
DOIs
StatePublished - Jul 15 1993

Keywords

  • Keywords
  • ceramic membranes
  • gas and vapour permeation
  • separation, shape-selective
  • silicalite-1
  • zeolite membranes

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics

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