PREPARATION OF CALCINED TITANIUM OXIDE AND CATALYST

PURPOSE:To prepare the titled calcined material, having a large surface area and improved strength and heat resistance, and suitable for a catalyst or catalytic carrier, by calcining metatitanic acid in the form of a sol containing a fine particulate silicic acid. CONSTITUTION:Metatitanic acid in the form of a sol containing fine particulate silicic acid, preferably having 10-50mmu average particle diameter and 200- 300m /g specific surface area, is calcined to give the aimed calcined titanium oxide. The fine particulate silicic acid is present in the metatitanic acid in the form of the sol, and the resultant mixture is calcined to disperse the fine particulate silicic acid uniformly in the resultant calcined material. The titanium oxide remains as the ungrown anatase type crystal by the action of the fine particulate silicic acid, and the surface area is large with the remarkably improved mechanical strength and heat resistance. The resultant calcined titanium oxide is used as a carrier for supporting the metallic oxide having the catalytic activity of removing the nitrogen oxide to give the improved catalyst having the activity of removing the nitrogen oxide for a long term by the synergistic action of the anatase type titanium oxide and the fine particulate silicic acid and a low oxidation ratio of SO2 into SO3.