Catalytically active particulate filter body and method of making

A method of making a porous ceramic honeycomb filter body, the method comprising:

• depositing filtration material comprising filtration particles onto porous filter walls of a filter structure, wherein the filter structure comprises a matrix of the filter walls configured as a cellular honeycomb structure comprised of cells wherein surfaces of the filter walls define channels comprising inlet channels and outlet channels extending from an inlet end to an outlet end of the filter structure, wherein the filter structure comprises a first group of plugs disposed within and sealing the inlet channels at or near the outlet end and a second group of plugs disposed within and sealing the outlet channels at or near the inlet end, wherein the porous filter walls comprise opposing first and second wall surfaces and the filtration particles are supported by the filter walls on, in, or both on and in, the first wall surfaces, then,
• heat treating the filter structure to provide filtration material heat treatment by heating the filter structure to one or more filtration heat treatment temperatures less than or equal to 500° C. and for a time sufficient to reduce hydrophobicity of the filtration material, wherein the filtration material is hydrophobic prior to the depositing and/or hydrophobicity is imparted to the filtration material after the depositing and prior to the heat treating,
• depositing catalytic material onto the second surfaces of the porous filter walls, such that the catalytic material is disposed in the filter walls and/or on the second surfaces of the filter walls, wherein the second surfaces define the outlet channels.

A method of making a porous ceramic honeycomb filter body, the method comprising:

• depositing filtration material comprising filtration particles onto porous filter walls of a filter structure, wherein the filtration material is disposed on or in the filter walls and the filtration material is hydrophobic, and wherein the filter structure comprises a matrix of the filter walls configured as a cellular honeycomb structure comprised of cells wherein surfaces of the filter walls define channels comprising inlet channels and outlet channels extending from an inlet end to an outlet end of the filter structure, wherein the filter structure comprises a first group of plugs disposed within and sealing the inlet channels at or near the outlet end and a second group of plugs disposed within and sealing the outlet channels at or near the inlet end, wherein the porous filter walls comprise opposing first and second wall surfaces and the filtration material is supported by the filter walls on, in, or both on and in, the first wall surfaces, then,
• heat treating the filter structure to provide filtration material heat treatment by heating the filter structure to one or more filtration heat treatment temperatures and preserving at least some hydrophobicity of the filtration particles, then,
• depositing catalytic material onto the second surfaces of the porous filter walls, such that the catalytic material is disposed in the filter walls and/or on the second surfaces of the filter walls while the filtration material is hydrophobic, wherein the second surfaces define the outlet channels.