PURPOSE: To provide a method for producing a high performance exhaust gas purifying catalyst capable of removing NOx, NH3 and CO simultaneously.
CONSTITUTION: As a first component, is provided a composition consisting of the oxides made up of the combination of Ti-V, Ti-Mo, Ti-W, Ti-V-W and Ti-V-Mo and, as a second portion, is provided a composition having precious metal element supported on the salt of noble metal such as chloroplatinic acid, palladium nitrate and rhodium chloride or zeolite, porous silica or porous alumina. The powder of the second component is covered with a water-immiscible film such as a vinyl polymer, cellulose compound and glue. The film covered powder is thereafter mixed with the first component, water is added to this mixture, which is kneaded, shaped, dried and baked. This method provides a highly active denitration catalyst excellent in decomposing activity of unreacted NH3 and oxidative decomposition activity of CO in the exhaust gas denitrated in a high NH3 to NOx ratio.
KONISHI KUNIHIKO
HAMADA IKUHISA
