Time-resolved studies on correlations between dynamic electronic structure and selectivity of a H5[PV2Mo10O40] partial oxidation catalyst

Time-resolved in situ X-ray absorption spectroscopy studies on an activated H5[PV2Mo10O40] oxidation catalyst were performed to obtain correlations between the dynamic structure and the catalytic selectivity of the material. Both the geometric and electronic structures of the vanadium and molybdenum...

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Bibliographic Details
Published in:Journal of catalysis 2007-04, Vol.247 (2), p.231-237
Main Authors: RESSLER, Thorsten, TIMPE, Olaf
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
Kinetics
Oxidation
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Time-resolved in situ X-ray absorption spectroscopy studies on an activated H5[PV2Mo10O40] oxidation catalyst were performed to obtain correlations between the dynamic structure and the catalytic selectivity of the material. Both the geometric and electronic structures of the vanadium and molybdenum metal centers of the catalyst change dynamically under the reaction conditions used. Moreover, the selectivity of the catalyst exhibits a pronounced correlation with the degree of reduction and the solid-state kinetics of the reoxidation process. The corresponding extent of reoxidation curve can be simulated with a solid-state kinetic model assuming three-dimensional diffusion as the rate-limiting step. Thus, the partially reduced catalyst exhibits a rate constant of the bulk-diffusion limited reoxidation, coinciding with the temporal evolution of the selectivity of the catalyst. [PUBLICATION ABSTRACT]
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2007.01.017