Exhaust gas cleaning catalyst and process for production thereof

摘要

An exhaust gas cleaning catalyst composed of a refractory three-dimensional structure and a catalytically active substance supported thereon. That surface or part of the catalyst which makes contact with an exhaust gas is formed of numerous irregularly arranged protrusions composed of a refractory inorganic powder having a particle diameter of 5 to 300 micrometers or a mixture of it with refractory inorganic fibers and the catalytically active substance supported on the protrusions. The catalyst can be produced, for example, by preparing an aqueous slurry from the refractory inorganic powder having a particle diameter of 5 to 300 micrometers or a mixture of it with the refractory inorganic fibers and a suitable dispersant, forming numerous irregularly arranged protrusions on that surface or part of a refractory three-dimensional structure which makes contact with an exhaust gas by using the resulting slurry, drying the structure optionally followed by calcination, depositing the catalytically active substance, and drying and calcining the resulting structure.