Dispersion and Structure Studies of Molybdenum Oxide on Anatase TiO2

Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (6): 685-689.

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Dispersion and Structure Studies of Molybdenum Oxide on Anatase TiO₂

ZI Feng-lan¹, GUO Hong-you¹, WU Nian-zu², XIE Ya-ning³, HU Tian-dou³

1. Department of Applied Chemistry, Beijing University of Chemistry and Technology, Beijing 100029, P. R. China;
2. State Key Laboratory for Structural Chemistry of Unstable & Stable Species, Institute of Physical Chemistry, Peking University, Beijing 100871, P. R. China;
3. Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing 100039, P. R. China

Received:2003-10-10 Online:2004-12-24 Published:2011-08-06
Supported by:
Supported by the National Natural Science Foundation of China(No.29733080) and the Major State Basic Research Development Program(No.G2000077503).

Abstract

Abstract: X-ray photoelectron spectroscopy(XPS) and extended X-ray absorption fine structure(EXAFS) were used to characterize the structure of the mixture of molybdenum oxide and anatase calcined at 723 K. The results indicate that molybdenum oxide can disperse onto the surface of anatase(TiO₂) and the dispersion threshold is 11.2 mg in per gram of MoO₃ or 4.8 Mo atoms/nm² TiO₂. When the content of MoO₃ is below the dispersion threshold, MoO₃ species is in highly dispersed state interacting strongly with TiO₂ support and in discrete tetrahedral coordination, [MoO₄], on the surface of TiO₂. When the MoO₃ loading is above this value, MoO₃ exists in both dispersed phase and crystalline phase. MoO₃ in dispersed phase is still a discrete [MoO₄] tetrahedron; MoO₃ in crystal phase is in octahedral coordination.

Key words: Molybdenum trioxide, Anatase, Dispersion

ZI Feng-lan, GUO Hong-you, WU Nian-zu, XIE Ya-ning, HU Tian-dou. Dispersion and Structure Studies of Molybdenum Oxide on Anatase TiO₂[J]. Chemical Research in Chinese Universities, 2004, 20(6): 685-689.

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Dispersion and Structure Studies of Molybdenum Oxide on Anatase TiO₂

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