摘要:
A substrate with a surface-collection-layer includes a honeycomb substrate having a porous partition wall that defines and forms cells, and a plurality of plugging portions. A surface-collection-layer is formed on a surface of the partition wall that forms the remaining cells, and the thickness of the surface-collection-layer on the outlet-side open end is larger than the thickness of the surface-collection-layer in a center area of the substrate. The partition wall has predetermined thickness, porosity, and average pore size. The surface-collection-layer has a predetermined thickness, porosity, and average pore size, and the substrate has a predetermined cell density.
摘要:
A honeycomb structural body includes porous partition walls arranged to form a plurality of cells which become through channels of a fluid, porosities of the partition walls are from 45 to 70%, a pore diameter distribution of the partition walls is measured by mercury porosimetry, the pore diameter distribution indicates a bimodal distribution, in the bimodal distribution, a pore diameter at the maximum peak value of a small pore side distribution is from 1 to 10 μm, and a pore diameter at the maximum peak value of a large pore side distribution exceeds 10 μm, and a ratio between a pore volume of the small pores and a pore volume of the large pores is in a range of 1:7 to 1:1 in the honeycomb structural body.
摘要:
There is provided a honeycomb catalyst body including, a honeycomb substrate, plugging portions, and a three way catalyst. All the cells are open in the inflow side end face, the honeycomb substrate has two regions of an inflow side region and an outflow side region, the inflow side region of the honeycomb substrate is a region from the inflow side end face to a position of 10 to 90% of a length in an central axial direction of the honeycomb substrate from the inflow side end face, and 100 to 400 g/L of the three way catalyst is loaded on the partition walls in the inflow side region, no catalyst is loaded on the partition walls in the outflow side region, and a ratio of the length to a diameter of the inflow side end face of the honeycomb substrate is 1.1 to 2.0.
摘要:
A honeycomb structure includes: porous partition walls having a large number of pores and disposed to form a plurality of cells communicating between two end faces, and plugged portions disposed to plug each of the cells on one of the end faces. A percentage of the number of carbon particulates contained in combustion exhaust gas satisfying the following condition (1) and passing through a honeycomb structure is 80% or more at a space velocity of 25000/h. The condition (1) is that the carbon particulates has a mean diameter of 0.07 to 0.2 μm, a ratio of the carbon particulates having a diameter of 1 μm or more is 0.1% or less in number and that a concentration of the carbon particulates is 10 mg/m3. The honeycomb structure is excellent in purification efficiency, has low pressure loss, and is mountable even in a limited space.
摘要:
There is provided a honeycomb filter wherein particles having an average particle diameter smaller than the average pore diameter of partition walls are deposited at least in open pores formed in the surface layer of the partition wall and in the pores of the partition wall in a surface layer portion of the partition walls on the exhaust gas inflow side, thereby forming a composite region. The average pore diameter of the partition walls is 5 to 40 μm, and the porosity of the partition wall is 35 to 75%. The particles to be deposited have an average particle diameter of 1 to 15 μm, and the height of the composite region is not more than 80 μm in the direction from the outermost contour line of the partition walls to the surface of the partition walls.
摘要:
There is provided a honeycomb catalyst carrier provided with porous partition walls containing cordierite or aluminum titanate as a main component and separating and forming a plurality of cells functioning as fluid passages. The partition walls have a porosity of 0.5% or more and 10% or less. The honeycomb catalyst carrier can be warmed up fast, and the temperature of the catalyst loaded on the honeycomb catalyst carrier can be raised faster.
摘要:
A honeycomb filter 20 includes a plurality of porous partition portions 22 forming a plurality of cells 23 serving as channels of fluid and trapping layers 24 that are formed on the partition portions and configured to trap a solid component contained in the fluid. In the honeycomb filter 20, a predetermined trapping region present on the partition portions 22 satisfies that, in an inscribed-circle-diameter distribution obtained by dividing an image of the partition portions captured with an electron microscope into a material region and a plurality of pore regions and by drawing maximum inscribed circles individually inscribed in the pore regions, a median pore diameter D50 is 1 μm or more and 6 μm or less and a median pore diameter D80 is 1 μm or more and 7 μm or less, and an inscribed-circle porosity determined from the inscribed-circle-diameter distribution is 35% or more and 60% or less.
摘要:
A honeycomb filter includes a partition portion having a thickness tp of 150 μm or more and 460 μm or less and a trapping layer having an average thickness tAve of 5 μm or more and 80 μm or less, wherein a film thickness ratio Y1 of a downstream thickness tl to an up- and mid-stream thickness thm satisfies a relationship according to formula (1), wherein a film thickness ratio Y2 of the maximum thickness tmax of a trapping layer to the average thickness tAve of the trapping layer satisfies a relationship according to formula (2), and wherein a cell has a hydraulic diameter HDin satisfying a relationship according to formula (3): −4/375·tAve+2.05≦Y1≦−17/375·tAve+10.23 (1); Y2≦−1/15·tAve+8.33 (2); and 0.95≦HDin≦2.0 (3).
摘要:
A honeycomb filter includes a cell having one open end and another closed end that serves as a fluid flow path and a cell having one closed end and another open end, wherein the cells are alternately disposed. The honeycomb filter includes an undeposited region in an upstream region of a partition portion, which has no trapping layer and has a length of 5% or more and 30% or less of the length of the inlet cell. The upstream region of the partition portion includes an undeposited region having an area of 10% or more of that of the cell in a cross-section perpendicular to the exhaust gas flow direction. The undeposited region with no trapping layer in the upstream region decreases the permeation resistance of the partition portion in the upstream region and facilitates fluid passage through the partition portion in the upstream region.
摘要:
There is provided a honeycomb structure where a catalyst is loaded on surfaces of inner pores of the surface layer and on a surface of the surface layer; a relation between a catalyst area proportion A of the catalyst to a gap area proportion B of a gap in a cross-section of the surface layer on the inlet side is 1% 1.5.