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Citation: Song Wei, Li Jing, Dou Bosheng. An Investigation of Redox Mechanism of Scheelite-type Multicomponent oxide Ag-Bi-V-Mo-O by XPS Spectra[J]. Chinese Journal of Applied Chemistry, ;1996, 13(2): 109-110. shu

An Investigation of Redox Mechanism of Scheelite-type Multicomponent oxide Ag-Bi-V-Mo-O by XPS Spectra

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Received Date: 4 July 1995
Available Online: 6 November 1995
Fund Project:

The redox behavior of Ag-doped bismuth vanadomolybdate catalysts and promotion of catalysis by Ag+ have been investigated by XPS in situ Ar⁺ ion etching. The results of XPS show that Mo⁶⁺ cation is the site on which hydrocarbons absorb and Bi³⁺ cation is responsible for converting molecular oxygen into lattice oxide ion. In the reaction process. Mo⁶⁺ cation is reduced by hydrocarbons and Bi³⁺ cation is oxidized by molecular oxygen. The V⁵⁺ cation is involved in diffusing O₂- and transferring electrons into the bulk of catalysts. Ag+-promoter is conducive to forming lattice oxide ions frorn molecular oxygen and increasing the reoxidation speed on the position of Bi^3- cation.
- bismuth vanadomolybdate,
- Ag⁺-promoter,
- XPS spectra,
- Ar⁺ ion etching,
- redox behavior
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