XAS STUDY OF V2O5 AL2O3 CATALYSTS DOPED WITH RARE-EARTH-OXIDES/

This paper reports on XAS studies of well dispersed V2O5/Al2O3 and V2O 5/Sm2O3/Al2O3 samples. XAS spectra at V-K and Sm-L(III) edges show tha t the rare earth oxide favours the formation of regular tetrahedral un its, [VO4], over the surface of the support. Positions of the preedge peak at the V-K edge, and intensities of the white line at the Sm-L(II I) edge also suggest modifications in the electronic density around V and Sm atoms when they are simultaneously supported over Al2O3.