Abstract
The ternary oxides, TiO 2ZrO 2V 2O 5: with an equal molar ratio of TiO 2 and ZrO 2, were characterized by the dehydrogenation and isomerization reactions of cyclohexane. The effects of V 2O 5 molar ratio on the acidic and basic properties, crystal structure, VO species, and the reaction activities were investigated. The maximum activities of both reactions were observed at the V 2O 5 molar ratio of 0.1 when the calcination temperature was 600 °C. That correlated well with surface acidic sites. The crystalline separation of ternary oxides was observed at a V 2O 5 molar ratio higher than 0.25. The reaction of dehydrogenation was retarded by K 2O but not significantly by B 2O 3, which indicates that the acidic sites play an important role in dehydrogenation reaction. A stepwise bifunctional mechanism was proposed.
Published Version
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