Filter catalyst and method of analyzing a catalytic layer thereof

A method of analyzing a catalytic layer of a filter catalyst comprising:

• comprising turning an SEM photograph on a cross section of the filter catalyst into electronic data so that, in an image being turned into electronic data, a coated state is analyzed from a ratio of a number of pixels forming an outer periphery of the catalytic layer to a number of pixels forming the catalytic layer;
• wherein the filter catalyst comprises:
• a catalyst-support substrate comprising a heat-resistant porous structure having chained pores;
• and a catalytic layer for burning particulates, the catalytic layer formed on a surface of the catalyst-support substrate, wherein:
• forming the catalytic layer comprises removing excess oxide slurry by repeating a pressure fluctuation at both ends of the catalyst-support substrate, and particles forming the oxide slurry having a diameter of 1 μm or less are present in an amount of 70% or more by weight of an entire amount of particles forming the oxide slurry.

A method of analyzing a catalytic layer of a filter catalyst comprising turning an SEM photograph on a cross section of the filter catalyst into electronic data so that, in an image being turned into electronic data, a coated state is analyzed from a ratio of a number of pixels forming an outer periphery of the catalytic layer to a number of pixels forming the catalytic layer;

• wherein the filter catalyst comprises:
• a catalyst-support substrate of comprising a heat-resistant porous structure having chained pores;
• and
• a catalytic layer for burning particulates, the catalytic layer formed on a surface of the catalyst-support substrate, wherein:
• forming the catalytic layer comprises removing excess slurry by repeating a pressure fluctuation at both ends of the catalyst-support substrate, and
• particles forming the slurry having a diameter of 1 μm or less are present in an amount of 70% or more by weight of an entire amount of particles forming the slurry.

A filter catalyst comprising:

• a catalyst-support substrate comprising a heat-resistant porous structure having chained pores;
• and a catalytic layer for burning particulates, the catalytic layer formed on a surface of the catalyst-support substrate;
• wherein:
• a ratio of an outer peripheral length of the catalytic layer in the cross section of the filter catalyst to a cross-sectional area of the catalytic layer is 0.5 or more;
• forming the catalytic layer comprises removing excess oxide slurry by repeating a pressure fluctuation at both ends of the catalyst-support substrate, substrate;
• and particles forming the oxide slurry having a diameter of 1 μm or less are present in an amount of 70% or more by weight of an entire amount of particles forming the oxide slurry.