Formation and characterization of supported microporous membranes prepared by sol-gel modification techniques

R.S.A. de Lange, J.H.A. Hekkink, K. Keizer*, A.J. Burggraaf

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

199 Citations (Scopus)
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Abstract

The formation is described of supported microporous membranes (by IUPAC definition rpore < 1 nm), prepared by modification of mesoporous γ-alumina membranes with polymeric sols. The mesoporous γ-alumina membranes, with a top-layer thickness in the order of 7–10 μm, and with pore radii of 2–2.5 nm, have a very high surface finish (mean roughness 40 nm). The amorphous microporous top-layer thickness is in the order of 60–100 nm. Gas transport properties are effectively improved as is shown by activated permeation and molecular sieve-like separation factors in the order of 50–200 for H2/CH4. These microporous top-layers can be prepared from a relatively wide range of sol structures; from inorganic oligomers which are too small to result in significant scattering with SAXS, to polymeric structures with fractal dimensions in the range: 1 <df <2.04, and radii of gyration between 0.8 and 4 nm.
Original languageEnglish
Pages (from-to)57-75
Number of pages19
JournalJournal of membrane science
Volume99
Issue number1
DOIs
Publication statusPublished - 1995

Keywords

  • Gas separation
  • Ceramic membranes
  • Microporous
  • Sol-gel process

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