Dependence of n-Butane Activation on Active Site of Vanadium Phosphate Catalysts

The nature and the role of oxygen species and vanadium oxidation states on the activation of n-butane for selective oxidation to maleic anhydride were investigated. Bi-Fe doped and undoped vanadium phosphate catalysts were used a model catalyst. XRD revealed that Bi-Fe mixture dopants led to formati...

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Bibliographic Details
Published in:Catalysis letters Vol. 130; no. 3-4; pp. 327 - 334
Main Authors: Taufiq-Yap, Y. H, Goh, C. K, Hutchings, G. J, Dummer, N, Bartley, J
Format: Journal Article
Language:English
Published: Boston Boston : Springer US 01.07.2009
Springer US
Springer
Springer Nature B.V
Subjects:
Activation
Anhydrides
Bismuth
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Dependence
Exact sciences and technology
General and physical chemistry
Industrial Chemistry/Chemical Engineering
Maleic anhydride
Organometallic Chemistry
Oxidation
Oxygen
Physical Chemistry
Reduction
Selectivity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Vanadium
Activation
Oxygen species
Vanadium phosphate
Butane oxidation
Vanadium
Maleic anhydride
Oxygen
Active site
Transition metal
Selectivity
Air
Conversion
X ray diffraction
n-Butane oxidation
Chemical reduction
Butane
Heterogeneous catalysis
Models
Oxidation
Catalyst
ISSN:1011-372X, 1572-879X
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Summary:The nature and the role of oxygen species and vanadium oxidation states on the activation of n-butane for selective oxidation to maleic anhydride were investigated. Bi-Fe doped and undoped vanadium phosphate catalysts were used a model catalyst. XRD revealed that Bi-Fe mixture dopants led to formation of αII-VOPO₄ phase together with (VO)₂P₂O₇ as a dominant phase when the materials were heated in n-butane/air to form the final catalysts. TPR analysis showed that the reduction behaviour of Bi-Fe doped catalysts was dominated by the reduction peak assigned to the reduction of V⁵⁺ species as compared to the undoped catalyst, which gave the reduction of V⁴⁺ as the major feature. An excess of the oxygen species (O²⁻) associated with V⁵⁺ in Bi-Fe doped catalysts improved the maleic anhydride selectivity but significantly lowering the rate of n-butane conversion. The reactive pairing of V⁴⁺-O⁻ was shown to be the centre for n-butane activation. It is proposed that the availability and appearance of active oxygen species (O⁻) on the surface of vanadium phosphate catalyst is the rate determining step of the overall reaction.
Bibliography:http://dx.doi.org/10.1007/s10562-009-0003-2
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ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-009-0003-2