FT-IR and FT-FIR studies of vanadium, molybdenum and tungsten oxides supported on different carriers

Research paper by Françoise Maugé, Jean-Paul Gallas, Jean-Claude Lavalley, Guido Busca, Gianguido Ramis, Vincenzo Lorenzelli

Indexed on: 01 Jan '88Published on: 01 Jan '88Published in: Microchimica Acta


In the far IR region at low molybdenum loadings, Mo-SiO2 catalysts present a pseudomolybdate or a polymolybdate species, while bulk-like MoO3 appears at loadings close to the geometrical monolayer coverage. W-SiO2 and V-SiO2 spectra show bands close to those observed on the corresponding bulk oxides.In the case of TiO2, Al2O3, ZrO2 supported catalysts, a band is observed near 1000 cm−1 which is assigned to the Mo=O stretching vibration of coordinatively unsaturated Mon+ ions showing a stronger interaction with the support than one observed on silica.