The structural changes of the supported vanadium oxide in the V2O5/TiO2(anatase) EUROCAT EL10V8 powder catalyst during reduction and oxidation at 420 and 490 degrees C were studied with in-situ X-ray absorption spectroscopy (XAS). The Vanadium K-edge XAS results are compared with pure bulk V2O5. For the reduction-oxidation cycle at 420 degrees C, similar structural changes as for bulk V2O5 were observed for the supported vanadium oxide: a reduction to the VO2 structure and re-oxidation back to V2O5. After reduction at 490 degrees C however, a different structure was obtained: very regular "VO6" octahedra with a V2.8+ valence. This may point to a structural support effect.