ZrO2-coated TiO2 powder was prepared using zirconium tetra-n-butoxide through the sol-gel method. Specific surface area and photocatalytic activity of ZrO2-coated TiO2 powder was measured. Crystalline phase of ZrO2-coated TiO2 powder was investigated. Specific surface area, crystalline phase and catalytic activity depended on amount of ZrO2-coated. The photocatalytic activity of TiO2 powder was decreased with increasing heat-treatment temperature at the range from 400°C to 800°C. The photocatalytic activity of 1 mass% ZrO2-coated TiO2 powder was higher than that of uncoated TiO2 powder after the heattreatment at 400°C, 600°C and 800°C, respectively. It is considered that sintering of heated TiO2 powder is depressed by coated ZrO2.
