Patent ID: 7943115

Claim:
A method for preparing a porous titanium oxide which comprises: adding a particle growth inhibitor to a hydrosol, a hydrogel or a dried product of a hydrous titanium oxide obtained by the reaction of a titanium compound as a raw material with a pH adjusting agent in an aqueous solvent and represented by the general formula TiO (2-x) (OH) 2x . yH 2 O (wherein 0.1≦x<2.0 and 0.3≦y≦40) so as to inhibit growth of a titanium oxide particle; and drying and calcining a mixture obtained by adding the particle growth inhibitor to the hydrosol, the hydrogel or the dried product of the hydrous titanium oxide so as to yield a titanium oxide which has a specific surface area of 80 m 2 /g or more, a pore volume of 0.2 ml/g or more and a pore sharpness degree of 50% or more, wherein the particle growth inhibitor is a compound yielding ions containing at least one element selected from silicon (Si), magnesium (Mg), calcium (Ca) and manganese (Mn); wherein the particle growth inhibitor is added together with the titanium compound as a raw material to the reaction solvent during the synthesis of the hydrous titanium oxide, after the synthesis and before the dehydration of the hydrous titanium oxide or after the dehydration and before the calcination of the hydrous titanium oxide; and wherein the particle growth inhibitor is added to the hydrous titanium oxide so that an amount of the particle growth inhibitor is in a range of 0.1-3 wt % of the titanium oxide, where the particle growth inhibitor is deemed to have a weight of an oxide of the selected element for a calculation purpose.