Determination of surface V=O species of V2O5 catalysts during reaction condition by using in-situ Narp technique

Determination of surface V=O species of V2O5 catalysts during reaction condition by using in-situ... NARP (Nitric oxide-Ammonia Rectangular Pulse) technique was applied for the in-situ measurement of the number of surface V=O species of V2O5 catalysts. When V2O5 catalyst was exposed to flowing benzene/O2/N2 mixture gas at 573–673 K, the surface concentration of V=O species decreased and finally reached a steady state which was dependent on the [O2]/[Benzene] ratio in the feed gas. It was confirmed by XPS spectra that the decrease in the surface V=O species is attributed to the reduction of the V2O5 surface. Although calcination of V2O5 at above 873 K reduced the surface concentration of V=O species, it recovered after a cyclic reduction-oxidation treatment at 673 K, which modifies the near-surface layer of V2O5. The dependence of the surface V=O species on calcination temperature was correlated with the flatness of the surface and the diffusion of lattice oxygen in near-surface layer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Determination of surface V=O species of V2O5 catalysts during reaction condition by using in-situ Narp technique

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Publisher
Springer Netherlands
Copyright
Copyright © 1998 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856798X00474
Publisher site
See Article on Publisher Site

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