In situ FT-IR microscopic investigation of metal substituted AlPO4-5 single crystals

G. Müller, J. Bódis, G. Eder-Mirth, J. Kornatowski, J. A. Lercher

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20 Scopus citations


First direct spectroscopic evidence for the existence of Bronsted acid sites in ALPO4-5 (AFI) single crystal molecular sieves substituted with divalent metal cations is reported. Ammonia and pyridine were used as probe molecules. Compared with unsubstituted AlPO4-5 single crystals, the metal substituted samples exhibit well-developed bands of isolated hydroxyl groups and a broad absorption hand indicating the existence of hydrogen bonded OH groups. Upon adsorption of pyridine on the metal substituted samples the formation of a new, relatively free vibrating hydroxyl group (V(OH) = 3690-3694 cm-1) was observed, giving evidence for a strong Lewis type interaction leading to the cleavage of a metal-oxygen bond close or at the position of the substituting metal cation.

Original languageEnglish
Pages (from-to)173-178
Number of pages6
JournalJournal of Molecular Structure
StatePublished - 1997
Externally publishedYes


  • FT-IR spectroscopy
  • Single crystals
  • Substituted AFI


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