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Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane |
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| Authors: | YHTaufiq-Yap SNor Asrina GJHutchings NFDummer JKBartley Centre of Excellence for Catalysis Science Technology Faculty of Science Universiti Putra Malaysia UPM Serdang Selangor Malaysia |
| Affiliation: | Y.H.Taufiq-Yap1,2,S.Nor Asrina1,G.J.Hutchings3,N.F.Dummer3,J.K.Bartley3 1.Centre of Excellence for Catalysis Science and Technology,Faculty of Science,Universiti Putra Malaysia,43400 UPM Serdang,Selangor,Malaysia,2.Department of Chemistry,3.Cardiff Catalysis Institute,School of Chemistry,Cardiff University,Cardiff CF10 3AT,United Kingdom |
| Abstract: | Te-promoted (1%) vanadium phosphate catalyst (VPDTe) was prepared via VOPO4·2H2O by calcining its precursor VOHPO4·0.5H2O in a flow of n-butane/air. VPDTe catalyst has resulted a higher existence of V5+ phase with V5+/V4+ ratio of 0.23. SEM micrographs show that Te addition altered the arrangement of the platelets from “rose-like” clusters to layer with irregular shape. Te addition has also markedly lowered the reduction activation energies of the vanadium phosphate catalyst as revealed by TPR profile. The amount of active oxygen species associated with V4+ phase of the Te promoted catalyst was significantly higher than those of the unpromoted catalyst. These observations suggest that high mobility and availability of reactive oxygen species contributed to the enhancement of n-butane conversion up to 80% at 673 K, while only 47% over unpromoted catalyst (2400 h?1, 1.7% n-butane in air). |
| Keywords: | vanadium phosphate tellurium promoter butane oxidation |
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