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Dependence of n-butane activation on active site of vanadium phosphate catalysts


Yap, Taufiq Yun Hin and Goh, Chee Keong and Hutchings, Graham John and Dummer, Nicholas F. and Bartley, Jonathan K. (2009) Dependence of n-butane activation on active site of vanadium phosphate catalysts. Catalysis Letters, 130 (3-4). pp. 327-334. ISSN 1011-372X; ESSN: 1572-879X


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.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1007/s10562-009-0003-2
Publisher: Springer
Keywords: Vanadium phosphate; n-butane oxidation; Vanadium; Oxygen species; Maleic anhydride; Activation
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 18 Jun 2015 02:11
Last Modified: 25 Nov 2016 07:54
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1007/s10562-009-0003-2
URI: http://psasir.upm.edu.my/id/eprint/13897
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