Preparation and characterization of microporous metal oxides


  • We are grateful for support provided by the Bundesministerium für Forschung and Technologie. grant number BMFT 03 C257-5. We thank M. T. Otten from Philips Analytical in Eindhoven for the electron microscopy study of the amorphous silica and Dr. H. Grondey and J. Heilmann for the solid-state Xe-NMR measurements


The reliable preparation of microporous membranes capable of molecular-size exclusion requires the availability of stable microporous and uniform inorganic oxides with a monomodal and narrow pore-size distribution and a pore diameter maximum below 1 nm. A new method of pore-size analysis is presented and the optimization of the sol-gel process used to produce the microporous oxides discussed.