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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2009
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| Online Access: | http://psasir.upm.edu.my/id/eprint/13897/1/Dependence%20of%20n-Butane%20activation%20on%20active%20site%20of%20vanadium%20phosphate%20catalysts.pdf |
| _version_ | 1796968533853208576 |
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| author | Yap, Taufiq Yun Hin Goh, Chee Keong Hutchings, Graham John Dummer, Nicholas F. Bartley, Jonathan K. |
| author_facet | Yap, Taufiq Yun Hin Goh, Chee Keong Hutchings, Graham John Dummer, Nicholas F. Bartley, Jonathan K. |
| author_sort | Yap, Taufiq Yun Hin |
| collection | UPM |
| description | 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. |
| first_indexed | 2024-03-06T07:29:43Z |
| format | Article |
| id | upm.eprints-13897 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T07:29:43Z |
| publishDate | 2009 |
| publisher | Springer |
| record_format | dspace |
| spelling | upm.eprints-138972016-11-25T07:54:21Z http://psasir.upm.edu.my/id/eprint/13897/ Dependence of n-butane activation on active site of vanadium phosphate catalysts Yap, Taufiq Yun Hin Goh, Chee Keong Hutchings, Graham John Dummer, Nicholas F. Bartley, Jonathan K. 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. Springer 2009-07 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/13897/1/Dependence%20of%20n-Butane%20activation%20on%20active%20site%20of%20vanadium%20phosphate%20catalysts.pdf 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 10.1007/s10562-009-0003-2 |
| spellingShingle | Yap, Taufiq Yun Hin Goh, Chee Keong Hutchings, Graham John Dummer, Nicholas F. Bartley, Jonathan K. Dependence of n-butane activation on active site of vanadium phosphate catalysts |
| title | Dependence of n-butane activation on active site of vanadium phosphate catalysts |
| title_full | Dependence of n-butane activation on active site of vanadium phosphate catalysts |
| title_fullStr | Dependence of n-butane activation on active site of vanadium phosphate catalysts |
| title_full_unstemmed | Dependence of n-butane activation on active site of vanadium phosphate catalysts |
| title_short | Dependence of n-butane activation on active site of vanadium phosphate catalysts |
| title_sort | dependence of n butane activation on active site of vanadium phosphate catalysts |
| url | http://psasir.upm.edu.my/id/eprint/13897/1/Dependence%20of%20n-Butane%20activation%20on%20active%20site%20of%20vanadium%20phosphate%20catalysts.pdf |
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