| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5367858 | Applied Surface Science | 2011 | 6 Pages |
Surface state and reactivity of vanadium-tin mixed oxide nanoparticles (V/Sn ratios 0.05-0.2) were characterized by spectroscopic techniques and catalytic measurements. Analyses by X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS) revealed that the oxidation state and surface structure of vanadium oxide species and the electronic interaction between Sn and V atoms are dependent upon the vanadium content. These oxides were evaluated as catalysts for methanol oxidation in a fixed-bed reactor. Both reaction rate and formaldehyde selectivity increased with increasing the vanadium amount in catalyst. Results demonstrate that the V5+ site in the bridging V-O-Sn structure exhibits a high redox activity to facilitate the transformation of adsorbed methoxy to formaldehyde and that the vanadium dispersion plays a crucial role in the surface reactivity. A mechanism that elucidates the catalytic redox process is proposed.
Research highlights⺠Surface state and reactivity of vanadium-doped tin oxide. ⺠Vanadia dispersion and catalysts for methanol oxidation. ⺠Vanadium promotes catalytic conversion of methanol to formaldehyde. ⺠High oxidation state of vanadia and vanadium-tin interaction enhance redox activity.
