Preparation of Highly Dispersed Anchored Vanadium Oxides by Photochemical Vapor Deposition Method and Their Photocatalytic Activity for Isomerization of trans-2-Butene

Article abstract of DOI:10.1021/j100341a006

Highly dispersed anchored vanadium oxide catalysts have been first prepared by using facile reaction of the photochemically activated VOCl3 molecules with surface OH groups on Vycor glass.Anchored vanadium oxides prepared by photochemical method (photo-CVD) exhibit much higher yields in the phosphorescence with its long lifetimes (450 μs).These anchored vanadium oxides exhibit a higher activity for the photocatalytic isomerization reactions of 2-butene, as compared with those obtained for the oxides prepared by conventional impregnation method.A good linear relationship between the yields of photocatalytic isomerization and the vields of phosphorescence from the charge-transfer excited triplet state of the surface vanadyl species in tetrahedral coordination is obtained, indicating that not only the surface vanadyl species play a significant role in the photocatalytic reaction on vanadium oxide catalysts, but also a photochemical vapor deposition method leads to the higher dispersion of vanadium than impregnation method.