Characterisation of strongly bonded V(V) species in VOx/TiO2 catalyst by static and MAS solid-state 51V NMR spectroscopy

51V static and MAS NMR spectroscopy of central transition is shown to be an effective method for the characterisation of strongly bonded V(V) species in VOx/TiO2 catalysts. Simultaneous determination of quadrupole and CSA tensors parameters (i.e., CQ, ηQ, δσ, ησ) from both static and MAS NMR spectra of central transition permits the extraction of all NMR parameters with a reasonable accuracy. For the first time, a large 51V quadrupolar constant (14–16 MHz) has been obtained for strongly bonded V(V) species in a supported vanadia catalyst, whereas CSA tensor principal components were found to be very close to those for bulk vanadium (V) oxide.