Oxidation state of vanadium introduced in dealuminated beta zeolite by impregnation with V(super IV)OSO(sub 4): Influence of preparation parameters

Article Abstract:

A study on the sample of vanadium introduced-dealuminated beta zeolite by impregnation with V(super IV)OSO(sub 4) aqueous solution that was characterized using spectroscopy, XRD and N(sub 2)-physisorption is conducted. The formation of different kinds of tetrahedral V species is related to the presence in vacant T sites of VSibeta zeolite of different types of defect sites such as trigonal triple bond Si(super +) defect or SiOH and SiO(super -) groups.

Analysis, Spectrum analysis, Spectroscopy, Oxidation-reduction reactions

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The oxidation of methanol to formaldehyde on TiO2 (110)-supported vanadia films

Article Abstract:

Vanadia Films supported on single-crystal metal oxide substrates are excellent model systems for studying the relationships between the structure and reactivity of supported oxide catalysts. The results of this study demonstrate that monolayer and submonolayer vanadia films supported on TiO2(110) in which the vanadium cations are in the +3 oxidation state are active for the oxidation of methanol to formaldehyde.

Monomolecular films, Oxidation reduction reactions, Metallic oxides, Metal oxides

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Fundamental photoelectrocatalytic and electrophoretic mobility studies of Tio2 and V-doped TiO2 thin-film electrode

Article Abstract:

Titanium dioxide (TiO2) and vanadium-doped titanium dioxide prepared by the sol-gel method showed a quantum-size effect in the form of a 0.19 eV blue shift in the band gap energy compared to the bulk TiO2. The concentration of vanadium as a dopant up to 1% atom ratio increased the pH of the isoelectric point above the value of 5.8 found for pure TiO2.

Titanium dioxide, Photoelectrons

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