| 摘要 |
PURPOSE: To suppress the peeling and falling of a catalytic component by coating the surface of a honeycomb structure with an aq. slurry for coating having a specified viscosity and contg. a catalyst, a specified fixing agent, one or more kinds of specified viscosity reducing agents and a specified peeling preventing agent, and carrying out firing. CONSTITUTION: A catalyst is slurried with water, the surface of a honeycomb structure is coated with the resultant aq. slurry and the catalyst is fixed to obtain a honeycomb structure catalyst. At this time, a fixing agent made of a catalyst and one or more of sols of alumina, silica, titania and zirconia, one or more kinds of viscosity reducing agents selected from among acetic acid, acetic anhydride and alkali salts of acetic acid and a peeling preventing agent made of silica ceramic fibers are incorporated into the aq. slurry for coating and the viscosity of the slurry is regulated to <100cps. After the slurry is applied on the surface and the catalyst is fixed, firing is carried out. |
