| http://www.w3.org/ns/prov#value | - As processes for preparing such a catalyst containing titanium oxide as a main component, there are known, for example a process which comprises adding an aqueous solution of a soluble tungsten compound to titanium hydroxide precipitate gel obtained by adding ammonia water to an aqueous solution of a soluble titanium compound, and mixing the mixture, followed by molding, drying and calcination; a
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