摘要:
A honeycomb filter of the present invention includes a ceramic honeycomb substrate including a porous honeycomb fired body having a large number of cells placed longitudinally in parallel with one another with a cell wall interposed therebetween, each of the cells passing fluid therethrough and being sealed at either a fluid inlet end or a fluid outlet end of the cell; and an auxiliary filter layer including at least two layers, the auxiliary filter layer being formed on a surface of the cell wall of the cell opened at the fluid inlet end and sealed at the fluid outlet end, and on a pore portion in the cell wall. The auxiliary filter layer includes a first layer in which particles having a first average particle diameter are deposited on the surface of said cell wall, and a second layer in which particles having a smaller second average particle diameter than said first average particle diameter are deposited on a surface of said first layer.
摘要:
An object of the present invention is to provide a honeycomb filter having low pressure loss and high collection efficiency. The honeycomb filter of the present invention comprises a ceramic honeycomb substrate in which a multitude of cells through which a fluid flows are disposed in parallel in a longitudinal direction and are separated by cell walls, each cell being sealed at an end section at either the fluid inlet side or the fluid outlet side, and a filter layer which, among the surfaces of the cell walls, is formed on the surface of the cell walls of those cells in which the end section at the fluid inlet side is open and the end section at the fluid outlet side is sealed by a sealing material, wherein the filter layer comprises spherical ceramic particles, and the average particle size of the spherical ceramic particles increases gradually from the fluid inlet side toward the fluid outlet side.
摘要:
A honeycomb filter of the present invention includes a ceramic honeycomb substrate having a large number of cells placed longitudinally in parallel with one another with a cell wall interposed therebetween, each of the cells passing fluid therethrough and being sealed at either a fluid inlet end or a fluid outlet end of the cell; an auxiliary filter layer formed on a surface of the cell wall of the cell opened at the fluid inlet end and sealed at the fluid outlet end in the surface of the cell wall; and an SCR catalyst supported on a surface of the cell wall of the cell sealed at the fluid inlet end and opened at the fluid outlet end, in the cell wall on which the auxiliary filter layer is formed. The honeycomb filter includes a portion that satisfies a