Abstract
Zirconia and titania nanoparticle sols were prepared, using either ligand-based precursor stabilization or acid stabilization routes. These sols were used to prepare microporous coatings on γ-alumina substrates. The acetylacetonate-based particles have very small hydrodynamic diameters (1–2 nm), which lead to sol intrusion into the supports. As a result no appropriate membrane layer was formed. A microemulsion-based zirconia sol leads to a membrane that was selective in pervaporation dehydration of a water/n-butanol mixture. An optimized membrane showed stable separation performance for 120 days with a high selectivity toward water. Permporometry and gas permeation results on a titania membrane based on an acid-stabilized sol not only show microporosity, but also a significant contribution from defect flow.
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Acknowledgments
Part of this research was funded by the Dutch ministry of economic affairs via the agency SenterNovem through the EOS-LT program under project number EOSLT01023. Dr. J. Campaniello is acknowledged for his contributions to the sol–gel experiments at the start of this work. VGK expresses his gratitude to the Swedish Research Council for the grant “Molecular precursors and Molecular Models of Nanoporous Materials”.
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Kreiter, R., Rietkerk, M.D.A., Bonekamp, B.C. et al. Sol–gel routes for microporous zirconia and titania membranes. J Sol-Gel Sci Technol 48, 203–211 (2008). https://doi.org/10.1007/s10971-008-1760-x
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DOI: https://doi.org/10.1007/s10971-008-1760-x