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

Taufiq-Yap, Y. H., Goh, C. K., Hutchings, Graham John, Dummer, Nicholas and Bartley, Jonathan Keith 2009. Dependence of n-Butane Activation on Active Site of Vanadium Phosphate Catalysts. Catalysis Letters 130 (3-4) , pp. 327-334. 10.1007/s10562-009-0003-2

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Vanadium phosphate - n-Butane oxidation - Vanadium - Oxygen species - Maleic anhydride - Activation
Publisher: Springer
ISSN: 1011-372X
Last Modified: 02 Jan 2018 21:27
URI: http://orca.cf.ac.uk/id/eprint/6140

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