| 摘要 |
PURPOSE:To obtain the titled catalyst having large surface area and excellent mechanical strength and heat resistance by mixing at least one kind of a compd. selected from a tungsten compd. and a molybdenum compd. into colloidal orthotitanic acid and baking the mixture. CONSTITUTION:Orthotitanic acid is brought into sol and 5-40wt%, based on the titanium oxide, or a tungsten compd. and/or molybdenum compd. is added and mixed. The mixture is baked at >=800 deg.C. The tungsten compd. and the molybdenum compd. are the precursors forming oxides on baking. The baked product is the titanium oxide of an ungrown anatase type crystal and is appropriately used as a catalyst carrier or a catalyst. Furthermore, a metallic oxide having catalytic activity on removing nitrogen oxides can be deposited on the baked product. Those catalysts for removing nitrogen oxides maintain high activity for a long period. Moreover, the catalysts are practically and industrially excellent since the oxidation degree of sulfur dioxide is extremely low. |
