Numéro
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
Page(s) C2-859 - C2-861
DOI http://dx.doi.org/10.1051/jp4:1997259
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-859-C2-861

DOI: 10.1051/jp4:1997259

Ultrahighly Dispersed Titanium Oxide on Silica : Effect of Precursors on the Structure and Photocatalysis

S. Yoshida, S. Takenaka, T. Tanaka and T. Funabiki

Deparment of Molecular Engineering, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan


Abstract
The effect of precursor on the dispersion and catalytic performance of titanium oxide supported on silica has ben investigated. The catalysts were prepared by a simple impregnation method with three kinds of titanium complexes of different ligands (bis(isopropyato)-bis(pivaroylmethanato) : DPM, acetylacetonato : ACAC, tetrakis(isopropylato) : IPRO) with the aim of preparing ultrahighly dispersed titanium oxide on silica. The XAFS study revealed that titanium species in the catalyst prepared from the complex with DPM ligand was a mononuclear species of an almost regular tetrahedral TiO4. The species prepared from the complex with ACAC ligand was also mononuclear but the titanium ion was coordinated by five oxygen atoms. The complex with IPRO ligand resulted in preparation of a catalyst containing some aggregated titanium species. These catalysts exhibited a remarkable difference in photooxidation of propane.



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