Abstract: CeO₂-TiO₂ oxides were prepared by sol-gel methods from cheap precursors (TiCl₄ and Ce(NO₃)₃) and their morphology,
crystalline phase, surface area and pore structure were characterized by BET, TEM and XRD. The results show that the CeO₂-TiO₂ mixed
oxides prepared by supercritical fluid drying method (SCFD) have high surface area and large pore volume. With the increase of CeO₂
concentration from 5% to 40% in the CeO₂-TiO₂ mixed oxide, the surface area increases from 67.3m₂·g^-1 to 219.4m²·g^-1,
the crystalline phase changes from anatase to amorphous, and the morphology from isolated particle to very small particles interlinked
to a three-dimension network structure. But the CeO₂-TiO₂ mixed oxides prepared by conventional drying method show lower pore volume
and surface area with serious aggregation, and amorphous phase compared to the corresponding aerogels.

Key words: sol-gel, supercritical fluid drying, conventional drying, CeO₂-TiO₂ mixed oxides