Journal of the American Chemical Society, Vol.126, No.15, 4926-4933, 2004
The complete V-51 MAS NMR spectrum of surface vanadia nanoparticles on anatase (TiO2): Vanadia surface structure of a DeNO(x) catalyst
The first observations of the complete manifold of spinning sidebands (ssbs) including both the central and satellite transitions in V-51 MAS NMR spectra of surface vanadia nanoparticles on titania in DeNO(x) catalysts are presented. V-51 quadrupole coupling and chemical shift anisotropy parameters for the dominating vanadia structure are determined from V-51 MAS NMR spectra recorded at 9.4 and 14.1 T. Based on correlations previously established between V-51 NMR parameters and crystal structure data for inorganic vanadates, the NMR data are consistent with vanadium in a distorted octahedral oxygen coordination environment for the so-called strongly bonded vanadia species on the surface. The investigation includes two vanadia-titania model catalysts and six industrial-type DeNO(x) catalysts.