A method for an olefin polymerization catalyst comprises contacting a silica support or a chromium-silica support with titanium to produce a Cr/Si—Ti catalyst. A titanium-containing solution is used to facilitate the association of titanium with the support, wherein the titanium-containing solution is formed by contacting a solvent, an amino acid, optionally a peroxide, optionally a carboxylate and a titanium-containing compound. A method for preparation of an olefin polymerization catalyst comprises contacting a chromium-silica support with the titanium-containing solution under conditions suitable to form a pre-catalyst composition and further processing the pre-catalyst composition to produce a Cr/Si—Ti catalyst. A method for preparation of an olefin polymerization catalyst comprises contacting a silica support with the titanium-containing solution and a chromium-containing compound under conditions suitable to form a pre-catalyst composition and further processing the pre-catalyst composition to produce a Cr/Si—Ti catalyst.