On stability and performance of highly c-oriented columnar AlPO 4-5 and CoAPO-5 membranes

Jared A. Stoeger, Charitomeni M. Veziri, Miguel Palomino, Avelino Corma, Nick K. Kanellopoulos, Michael Tsapatsis, Georgios N. Karanikolos

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Continuous films comprised of highly c-oriented aluminophosphate AlPO 4-5 or cobalt-substituted AlPO4-5 (CoAPO-5) were grown on porous supports and subjected to heat treatment in order to investigate the potential for membrane applications. A study in the early stages of in-plane crystalline intergrowth revealed a potential mechanism for flake-like crystal formation between the original oriented columnar crystals. Variations in metal substitution (AlPO4-5, CoAPO-5), support (glass, silicon, porous alumina), and calcination method (conventional, rapid thermal processing) were chosen to examine the conditions by which structural integrity was compromised following secondary (or tertiary) growth, resulting in reduced membrane functionality. Through the use of rapid thermal processing, the structure debilitation could be partially avoided. The membrane quality was inspected through pervaporation measurements consisting of a liquid hydrocarbon feed of n-heptane and 1,3,5-triisopropylbenzene. By investigating the effect of template removal on the oriented, columnar crystalline structure, useful insight is provided into the potential for the membranes to participate in applications such as molecular separations, catalysis, or host-guest assemblies.

Original languageEnglish (US)
Pages (from-to)286-294
Number of pages9
JournalMicroporous and Mesoporous Materials
Issue number1
StatePublished - Jan 2012


  • AlPO-5
  • CoAPO-5
  • Membrane
  • Pervaporation
  • Rapid thermal processing

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    Stoeger, J. A., Veziri, C. M., Palomino, M., Corma, A., Kanellopoulos, N. K., Tsapatsis, M., & Karanikolos, G. N. (2012). On stability and performance of highly c-oriented columnar AlPO 4-5 and CoAPO-5 membranes. Microporous and Mesoporous Materials, 147(1), 286-294. https://doi.org/10.1016/j.micromeso.2011.06.028