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《Chinese Journal of Catalysis》 1986-01
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THE PROPERTIES OF OXYGEN SPECIES ON THE SURFACE OF V_2O_5/SiO_2 CATALYST

Zheng Xiao-ming, Zhou Lie-hua and Zhu Yi-fei (Department of Chemistry,Hangzhou University)  
The TPD spectra of the surface oxygen of V2O5/SiO2 catalyst have been obtained by using the high sensitive TPD-MS determination.TPD spectra show obviously that the surface oxygen of V2O5/SiO2 can be divided into three groups which possess different energies. The first group of surface oxygen is desorbed at 100-150℃, the second group is desorbed at 400-600℃, and the third at above 600℃. They correspond probably to the desorption of O2-, O- and O2- respectively in accordance with the ESR results. The area S1 of the first peak is no more than 5 - 10% of the total peak area (S1 + S2) of the catalyst, therefore, O- is the main form of active oxygen on V2O5/SiO2 catalyst. Dealing with the peak temperatures at different heating rates, the kinetic parameters of desorption species are obtained. The desorption activation energy -of the first peak is 7.83 Kcal/mol, it accords with the characteristic of weak-adsorbed O2-. The apparent activation energy of second peak is as high as 154 Kcal/mol, the reason is that the desorption step has to break two bonds of V-O-, and to overcome the big repelling force between two negative charges during the collisions of two M-O-.
【Fund】: 中国科学院科学基金~~
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