Zr-doped TiO2 (anatase) was prepared by the homogenous co-precipitation method of the aqueous solutions containing TiOSO4 and ZrCl4 using urea as the precipitation agent. Nanocrystallites of Zr-doped TiO2, 6-9 nm in size, intergrown with amorphous phase form 1-2 mu m porous spherical clusters. Crystallite size of anatase decreases with increasing Zr content, and the catalyst becomes totally amorphous at 10 mol.% Zr. All samples exhibit high specific surface area, which increases with the addition of zirconium (from 391.3 to 689.1 m(2) g(-1)).