Abstract:

TiO2-Al2O3 composites (TiO2 content is 0.08gTiO2/gAl2O3) were prepared by two methods: mixing gel and coprecipitation, and characterized by XRD, XPS, and LRS. The results show that γ-Al2O3 is the only species of crystal to be identified by XRD for both samples treated at 550℃ for 5 hours, but the forms of TiO2 are different. TiO2 is dispersed on the surface for the sample by mixing gel. As to the composite by coprecipitation, TiO2 is dispersed so well in the bulk that it is difficult to be detected by XRD or LRS.

Key words: TiO₂-Al₂O₃, Composite, Mixing gel, coprecipitation