期刊
CATALYSIS LETTERS
卷 107, 期 1-2, 页码 61-71出版社
SPRINGER
DOI: 10.1007/s10562-005-9732-z
关键词
EUROCAT EL10V8; supported vanadium oxide; absorption spectroscopy; VOx/TiO2( anatase); in situ XAS; V(2)O5
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.
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