ESR STUDY OF V2O5 CATALYST ON CARRIERS

ESR studies were carried out on V2O5 catalyst on two different carriers, Neobead and Alundum. The ESR spectrum of V2O5 catalyst on the Alundum carrier was a singlet which was similar to the spectrum of pure V2O5. A completely different spectrum having hyperfine structure was obtained from the V2O5 catalyst on the Neobead carrier. It was concluded that the ground state of V4+ in the catalyst on the Neobead was the dxy orbital. The molecular orbital interpretation of the g factors and the hf coupling constants lead to the conclusion that the unpaired electron was localized on the mother ion V4+. By computer simulation the linewidths of ESR spectra were determined. The analysis of the ESR spectrum suggests that the V4+ ion in the V2O5 catalyst on the Neobead was separately formed. The V4+ ion of V2O5 on the Alundum carrier forms a cluster. © 1969.