A Study of Redox Mechanism of Bi-Mo-Nb Complex Oxide Catalysts by ESR and XPS

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (2): 261.

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A Study of Redox Mechanism of Bi-Mo-Nb Complex Oxide Catalysts by ESR and XPS

CHEN Tong¹, YUAN Song-Yue¹, ZHANG Rui-Feng¹, ZHAN Rui-Yun¹, YU Zuo-Long²

1. Changchun Institute of Appied Chemistry, Academia Sinica, Changchun;
2. Chengdu Institute of Organic Chemistry, Academia Sinica, Chengdu, 610041

Received:1993-04-07 Revised:1993-10-10 Online:1994-02-24 Published:1994-02-24

Abstract

Abstract: α-Bi₂MO₃O₁₂ and Nb-doped α-Bi₂MO₃O₁₂ catalysts were studied by means of in situ ESR and XPS with Ar-ion sputtering.It was observed that the lattice oxygen diffusion and electron transition between Bi and Mo species in the catalyst during the redox cycle.Amodel for the redox mechanism in the catalyst was proposed.The substitution of small amount of Nb⁵⁺ for Mo⁶⁺ significantly enhances the redox rate due to forming oxygen vacancies caused by doping Nb⁵⁺ in α-Bi₂MO₃O₁₂,which accelerates the transfer speeds of oxygen and electron in catalysts.

Key words: Bi-Mo oxide catalyst, Redox mechanism, Solid defect, Oxygen vacacy, ESR, XPS

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CHEN Tong, YUAN Song-Yue, ZHANG Rui-Feng, ZHAN Rui-Yun, YU Zuo-Long. A Study of Redox Mechanism of Bi-Mo-Nb Complex Oxide Catalysts by ESR and XPS[J]. Chem. J. Chinese Universities, 1994, 15(2): 261.

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A Study of Redox Mechanism of Bi-Mo-Nb Complex Oxide Catalysts by ESR and XPS

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