Catalysis Letters

, Volume 15, Issue 3, pp 237–245 | Cite as

Acidic properties of vanadium oxide on magnesium fluoride

  • M. Wojciechowska
  • W. Gut
  • M. Grunwald-Wyspiańska
Article
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Accepted:

Abstract

Vanadium oxides supported on magnesium fluoride obtained by the impregnation and the precipitation-deposition method have been studied by IR spectroscopy. The adsorption of pyridine indicated the presence of Lewis acid centers on the impregnated samples, whereas on the samples prepared by precipitation both Lewis and Brønsted centers have been observed. From the adsorption coefficients of the 1540 cm−1 (Brønsted site) and 1445 cm−1 (Lewis site) bands the numbers of both sites have been estimated. The hydroxyl groups bound in the chains of the (VO3)n tetrahedra or those in the trigonal pyramids VO5 are believed to be responsible for the protonic centers, whereas the aprotonic centers occur at the ionic vanadium with coordinatively unsaturated spheres.

Keywords

Vanadium oxide magnesium fluoride acidic properties IR spectroscopy 
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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1992

Authors and Affiliations

  • M. Wojciechowska
    • 1
  • W. Gut
    • 1
  • M. Grunwald-Wyspiańska
    • 1
  1. 1.Faculty of ChemistryA. Mickiewicz UniversityPoznańPoland

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