To obtain a catalytic molding excellent in crushing strength without damaging catalytic activity by adding a precipitant in a metallic salt solution to obtain a precipitate, adding a molding assistant at need into a catalytic precursor obtained by treating the precipitate to mold and firing.
The metallic salt is one exhibiting the desired catalytic activity at the time of being fired to convert to a metal oxide and preferably soluble in a solvent at the time of preparing the solution. The metallic salt is dissolved in water or an organic solvent such as alcohol to prepare the metallic salt solution and the precipitant such as an aq. ammonia, sodium carbonate or the like is added thereto to obtain the precipitate consisting essentially of a metallic hydroxide. The precipitate is filtered, washed with a pure water and fired to obtain the catalytic precursor. The catalytic precursor, in which the molding assistant and an adequate binder are added at need, is heated and kneaded to make slurry-like and extrusion-molded into a prescribed shape such as cylindrical shape.
SHIRAGAMI KEN
HASEGAWA KATSUAKI
INABA MASASHI
