Doped microporous hybrid silica membranes for gas separation

Hammad F. Qureshi, Rogier Besselink, Johan E. ten Elshof, Arian Nijmeijer, Louis Winnubst*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)
72 Downloads (Pure)


Hybrid silica (i.e., bis-triethoxysilylethane: BTESE) membranes doped with B, Ta or Nb were made through a sol–gel process. Triethyl borate, tantalum (V) ethoxide (TPE) and niobium (V) ethoxide (NPE) were selected as doping precursors. The doping concentration was optimized to produce sols, suitable for membrane fabrication. Thermal stability, structural analysis, cross-sectional micrographs and single gas permeation experiments were performed on these membranes, and results are compared with an undoped BTESE membrane. It was observed that the synthesized doped BTESE materials and membranes resulted into a more open (and, in one occurrence, SF6 permeable) pore microstructure, showing high permeances of larger gas molecules, while having a cross-sectional thickness comparable to undoped BTESE membranes. Graphical Abstract: [Figure not available: see fulltext.][Figure not available: see fulltext.][Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)180-188
Number of pages9
JournalJournal of sol-gel science and technology
Issue number1
Publication statusPublished - 26 Jul 2015


  • Gas separation
  • Hybrid silica
  • Metal doping
  • Microporous membranes
  • Sol–gel synthesis


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