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Dehydrogenation of Isobutane to Isobutene over V2O5/gamma-Al2O3 Catalysts: Effects of the Extent of Catalyst Reduction on Catalytic Performance

Ma H., Fu Y.-H., Li Y., Wang Z. -L., Zhu W. -C., Wang G.-J.

Polish Journal of Chemistry

2003

Vol. 77 / nr 7

903-908

V2O5/_-Al2O3 catalysts for the dehydrogenation of isobutane to isobutene were prepared by impregnation and characterized by BET,H2-TPR, ESR and XPS. Based on our studies of the effects of the extent of catalyst reduction on catalytic performance, we conclude that the V2O5/_-Al2O3 catalytic activity for the dehydrogenation of isobutane is related to the valence state of vanadium present in the catalyst, in the order of V4+> V3+. Furthermore, V4+ species are the main active sites of this reaction under the present reaction conditions.

Effect of Potassium Modification of Structure and Reactivity of V2O5/gamma-Al2O3 for Isobutane Dehydrogenation to Isobutene

Ma H., Wang Z. -L., Zhu W. -C., Jing S. -B., Ji D. -H., Wang G.-J.

Polish Journal of Chemistry

2002

Vol. 76 / nr 12

1733-1738

Undoped and K-doped V2O5/ -Al2O3 catalysts for the dehydrogenation of isobutane to isobutene were prepared by impregnation and characterized by means of BET, H2-TPR, NH3-TPD, XPS and ESR. It is found that potassium addition changes acidic and electric properties of V2O5/ -Al2O3 and results in a better spreading of V2O5 over -Al2O3 surface. Small addition of potassium toV2O5/ -Al2O3 catalyst (K:V = 0.05), consisting of 12 wt% V2O5, increased the activity and selectivity in dehydrogenation of isobutane to isobutene.