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• W2081854580 abstract "In the present investigation the influence of addition of molybdenum oxide and iron oxide to a 5% V2O5/Al2O3 sample has been studied by Raman spectroscopy under ambient as well as dehydrated conditions. The results show that under ambient conditions the presence of both vanadium oxide and molybdenum oxide on the hydrated alumina surface results in the conversion of hydrated metavanadate species into hydrated decavanadate species and of hydrated MoO42− species into hydrated octahedrally coordinated clusters. This is due to the decrease in the net pH at point of zero charge relative to the individual metal oxide systems. For the mixed Fe2O3-V2O5/Al2O3 sample it has been found that under ambient conditions the hydrated metavanadate species are converted into hydrated pyrovanadate and orthovanadate species, which is ascribed to the basic nature of the surface iron oxide species. Under dehydrated conditions the presence of both vanadium oxide and molybdenum oxide on the alumina surface results in increased concentrations of surface vanadate and molybdate species, which are found at much higher surface coverage in the corresponding individual metal oxide systems. A similar effect has been observed in the presence of iron oxide, which also promotes the formation of a moderately distorted vanadium oxide species." @default.
• W2081854580 created "2016-06-24" @default.
• W2081854580 creator A5001233940 @default.
• W2081854580 creator A5066491588 @default.
• W2081854580 date "1992-11-01" @default.
• W2081854580 modified "2023-09-23" @default.
• W2081854580 title "Raman spectroscopy of V2O5, MoO3, Fe2O3, MoO3-V2O5, and Fe2O3-V2O5 supported on alumina catalysts: Influence of coverage and dehydration" @default.
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• W2081854580 doi "https://doi.org/10.1016/0304-5102(92)80182-g" @default.
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