Studies on Kinetic Properties of Active Oxygen on the Surfaces of V2O5/SiO2, V2O5-MoO3/SiO2 and V2O5-P2O5/SiO2 Catalysts

Abstract

Abstract: Applying the TPD-MS with a high sensitivity of determination, the TPD spectrum of surface oxygen of V₂O₅/SiO₂, V₂O₅-MoO₃/SiO₂ and V₂O₆-P₂O₅/SiO₂ catalysts was obtained.The surface oxygen of these catalysts can be divided into three groups according to the desorption temperature.O₂^-- from 673K to 873K and O^2-at above 873K.The activation energy and frequency factor of all the three kinds of oxygen species were calculated.Based on these results, the mechanism of oxygen desorption and the influence of P₂O₅ and MoO₃ on the properties of oxygen supply of V₂O₅/SiO₂ catalst were investigated.MoO₃ and a small amount of P₂O₅ increase the number of supplying oxygen and increase the activity of O^-species.A large amount of P₂O₅ increases the number of supplying oxygen and restrains the activity of O^- species.

Key words: Catalyst, Vanadium pentoxide, Oxygen

Zheng Xiaoming, Zhu Yifei, Zhou Lihua . Studies on Kinetic Properties of Active Oxygen on the Surfaces of V₂O₅/SiO₂, V₂O₅-MoO₃/SiO₂ and V₂O₅-P₂O₅/SiO₂ Catalysts[J]. Chemical Research in Chinese Universities, 1989, 5(4): 304-312.

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Studies on Kinetic Properties of Active Oxygen on the Surfaces of V₂O₅/SiO₂, V₂O₅-MoO₃/SiO₂ and V₂O₅-P₂O₅/SiO₂ Catalysts

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