Microporous SiO2 and SiO2/MOx (M=Ti, Zr, Al) for ceramic membrane applications: A microstructural study of the sol-stage and the consolidated state

R.S.A. de Lange*, K.N.P. Kumar, J.H.A. Hekkink, G.M.H. van de Velde, K. Keizer, A.J. Burggraaf, W.H. Dokter, H.F. van Garderen, T.P.M. Beelen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Microporous SiO2 and SiO2/MO2 (M=Ti, Zr, Al; 10 mol% MOx) materials for gas separation membrane applications have been prepared from polymeric sols. Characterization of these sols with SAXS showed that the mean fractal dimension of the SiO2 sols is 1.3-1.4 with a radius of gyration of approximately 2.5 nm. The dried and calcined films are microporous and the pore size distribution was bimodal with maxima at diameters of 0.5 nm and 0.75 nm. For the SiO2/TiO2, SiO2/ZrO2 and SiO2/Al2O3 systems, much milder reaction conditions proved to be necessary to obtain sols with comparable fractal dimensions due to the high reactivity of the Ti/Zr/Al-alkoxides. Microporous supported membranes with molecular sieve-like gas transport properties can be prepared from a relatively wide range of sol structures: from polymers too small to characterize with SAXS to structures with fractal dimensions: 1<df<2.04.

Original languageEnglish
Pages (from-to)489-495
Number of pages7
JournalJournal of sol-gel science and technology
Volume2
Issue number1-3
DOIs
Publication statusPublished - 1994

Keywords

  • Ceramic membrane
  • Gas separation
  • Microporous
  • Microstructure
  • SiO

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