Number of surface redox sites of V-Sb-O catalysts

Number of surface redox sites of V-Sb-O catalysts The NARP technique was applied for the measurement of surface redox sites of V-Sb-oxide catalysts. The profile of produced nitrogen in the NARP measurement was composed of two parts; the initial sharp peak and the tailing part, those represented the contribution of surface redox sites and regeneration step of the redox sites with lattice oxygen, respectively. The surface concentration of redox sites determined from the initial sharp peak was almost equivalent to the surface concentration of vanadium ions above surface Sb/V ratio of 1.0. The role of V-O-Sb sites on VSbO4 surface as redox sites was suggested. The tailing part was broader than that of V2O5 at the same temperature range because of the faster regeneration step relative to that in V2O5. The surface concentration and the regeneration of redox sites strongly depend on the preparation method. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Number of surface redox sites of V-Sb-O catalysts

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Publisher
Brill Academic Publishers
Copyright
Copyright © 2000 by VSP
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856700X00147
Publisher site
See Article on Publisher Site

Abstract

The NARP technique was applied for the measurement of surface redox sites of V-Sb-oxide catalysts. The profile of produced nitrogen in the NARP measurement was composed of two parts; the initial sharp peak and the tailing part, those represented the contribution of surface redox sites and regeneration step of the redox sites with lattice oxygen, respectively. The surface concentration of redox sites determined from the initial sharp peak was almost equivalent to the surface concentration of vanadium ions above surface Sb/V ratio of 1.0. The role of V-O-Sb sites on VSbO4 surface as redox sites was suggested. The tailing part was broader than that of V2O5 at the same temperature range because of the faster regeneration step relative to that in V2O5. The surface concentration and the regeneration of redox sites strongly depend on the preparation method.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jan 1, 2000

References

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