Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane

doi:10.1016/S1003-9953(10)60251-4

能源化学(英文) ›› 2011, Vol. 20 ›› Issue (6): 635-638.DOI: 10.1016/S1003-9953(10)60251-4

Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane

Y. H. Taufiq-Yap^1,2*, S. Nor Asrina^1,2, 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, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; 3. Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, United Kingdom

收稿日期:2011-04-27 修回日期:2011-07-26 出版日期:2011-11-20 发布日期:2011-11-18
通讯作者: Y.H. Taufiq-Yap

Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane

Y. H. Taufiq-Yap^1,2*, S. Nor Asrina^1,2, 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, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia; 3. Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, United Kingdom

Received:2011-04-27 Revised:2011-07-26 Online:2011-11-20 Published:2011-11-18

摘要/Abstract

摘要： 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).

关键词: vanadium phosphate, tellurium, promoter, butane oxidation

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).

Key words: vanadium phosphate, tellurium, promoter, butane oxidation

Y. H. Taufiq-Yap*, S. Nor Asrina, G. J. Hutchings, N. F. Dummer, J. K. Bartley. Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane[J]. 能源化学(英文), 2011, 20(6): 635-638.

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Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane

Effect of tellurium promoter on vanadium phosphate catalyst for partial oxidation of n-butane

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