INVESTIGATION OF THE EUROCAT V2O5 TIO2 CATALYSTS AND OF THE TIO2 SUPPORT BY SECONDARY-ION MASS-SPECTROMETRY/

The V2O5/TiO2 materials and the TiO2 support have been studied by seco ndary-ion mass spectrometry in three laboratories, using respectively static, dynamic and intermediate modes. Phosphorus, potassium and niob ium are present as significant impurities; titanium-containing ions pr edominate in all three materials, but there is some evidence for the f ormation of mixed ions of the type TiVO(x+). The concordance of these results with structural models developed from other techniques is disc ussed.