Gas transport and separation with ceramic membranes: Part II: Synthesis and separation properties of microporous membranes

R.J.R. Uhlhorn, K. Keizer*, A.J. Burggraaf

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

175 Citations (Scopus)
213 Downloads (Pure)

Abstract

Non-supported microporous silica (amorphous) and titania thin films were made by the polymeric gel route. The titania system consisted of particles smaller than 5 nm. Reproducible modification of supported γ-alumina films with silica demands a strict control of every modification step. Silica films of 30–60 nm thickness on top of and presumably partly inside the γ-alumina film were realised. The permeabilities of helium and hydrogen through this film are activated, while the propylene permeability was below the detection limit. Separation factors of a H2---C3H6 mixture are larger than 200 at 200 °C with a flux of the preferentially hydrogen of 1.6 × 10−6 mol/m2-sec-Pa. The pores must be of molecular dimensions to realise this (< 1 nm diameter). Preliminary research shows that changes in the synthesis parameters result in higher activation energies and improved separation properties. The relation between synthesis, resulting microstructure and gas separation properties, however, is not yet fully understood.
Original languageEnglish
Pages (from-to)271-287
Number of pages16
JournalJournal of membrane science
Volume66
Issue number2-3
DOIs
Publication statusPublished - 1992

Keywords

  • Ceramic membranes
  • Diffusion
  • Gas and vapor permeation
  • Microporous and porous membranes
  • Gas separations

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