A partial wall-flow filter having some unplugged flow-through channels and some plugged channels. Desirable combinations of filtration efficiency and back pressure may be provided by combinations of t wall≦305 urn, MPD≦20 μm, % P≧50%, and CD≧250 cpsi wherein t wall is the transverse thickness of the
A partial wall-flow filter having some unplugged flow-through channels and some plugged channels. Desirable combinations of filtration efficiency and back pressure may be provided by combinations of t wall≦305 urn, MPD≦20 μm, % P≧50%, and CD≧250 cpsi wherein t wall is the transverse thickness of the porous walls, MPD is a mean pore diameter of the porous walls, % P is the total porosity of the porous walls, and CD is the cell density of the channels. In one embodiment, some of the plugged channels are located adjacent to the inlet end and some are located adjacent to the outlet end. Systems and method including the partial wall-flow filter are also described.
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1. A partial wall-flow filter, comprising: a plurality of porous walls forming channels wherein some of the channels are plugged channels and some are unplugged flow-through channels, wherein the plugged channels include some channels at or near the center of the filter that are plugged adjacent to
1. A partial wall-flow filter, comprising: a plurality of porous walls forming channels wherein some of the channels are plugged channels and some are unplugged flow-through channels, wherein the plugged channels include some channels at or near the center of the filter that are plugged adjacent to an inlet end of the filter and other channels at or near the center of the filter that are plugged adjacent to an outlet end of the filter, a number of channels plugged adjacent to the inlet end is less than a number of channels that are plugged adjacent to the outlet end, and the porous walls further comprise:t wall≦305 μm,MPD≦20 μm,% P≧50%, andCD≧250 cpsiwherein t wall is the transverse thickness of the porous walls, MPD is a mean pore diameter of the porous walls, % P is the total porosity of the porous walls, and CD is the cell density of the channels. 2. The partial wall-flow filter of claim 1, further comprising a percentage of plugged channels to total channels greater than 50% and less than 100%. 3. The partial wall-flow filter of claim 1, further comprising percentage of plugged channels to total channels is greater than 70% and less than 100%. 4. The partial wall-flow filter of claim 1, further comprising percentage of plugged channels to total channels is greater than 80% and less than 100%. 5. The partial wall-flow filter of claim 1, wherein CD≧300 cpsi. 6. The partial wall-flow filter of claim 1, wherein CD≧350 cpsi. 7. The partial wall-flow filter of claim 1, wherein t wall≦254 μm. 8. The partial wall-flow filter of claim 1, wherein t wall≦203 μm. 9. The partial wall-flow filter of claim 1, wherein MPD≦15 μm. 10. The partial wall-flow filter of claim 1, wherein 12 μm≦MPD≦20 μm. 11. The partial wall-flow filter of claim 1, wherein a L/D ratio≦1.25, wherein the L/D ratio is the length of the partial wall-low filter divided by the diameter of the partial wall-low filter. 12. The partial wall-flow filter of claim 1, further comprising % P≧60%. 13. The partial wall-flow filter of claim 1, further comprising a cross sectional area of each of the plugged channels is greater than a cross sectional area of each of the unplugged channels. 14. The partial wall-flow filter of claim 1, wherein 40%≧FE≧70%, wherein FE is filtration efficiency. 15. A partial wall-flow filter, comprising: a plurality of porous walls forming channels, wherein the plugged channels include some channels at or near the center of the filter that are plugged adjacent to an inlet end of the filter and other channels at or near the center of the filter that are plugged adjacent to an outlet end of the filter, a number of channels plugged adjacent to the inlet end is less than a number of channels that are plugged adjacent to the outlet end, wherein some of the channels are plugged channels and some are unplugged flow-through channels and the porous walls further comprise: t wall≦254 μm,12 μm≦MPD≦20 μm,% P≧55%, andCD≧300 cpsiwherein t wall is the transverse thickness of the porous walls, MPD is a mean pore diameter of the porous walls, % P is the total porosity of the porous walls, and CD is the cell density of the channels. 16. A method of operating an exhaust system, comprising: providing a partial wall flow filter having a plurality of porous walls forming channels wherein some of the channels are plugged channels and some are unplugged flow-through channels in an exhaust line, wherein the plugged channels include some channels at or near the center of the filter that are plugged adjacent to an inlet end of the filter and other channels at or near the center of the filter that are plugged adjacent to an outlet end of the filter, a number of channels plugged adjacent to the inlet end is less than a number of channels that are plugged adjacent to the outlet end, wherein the porous walls further comprise: t wall≦305 μm,MPD≦20 μm,% P≧50%, andCD≧250 cpsiwherein t wall is the transverse thickness of the porous walls, MPD is a mean pore diameter of the porous walls, % P is the total porosity of the porous walls, and CD is the cell density of the channels, andpassing exhaust gas having particulate matter entrained therein through the partial wall-flow filter wherein some of the particulate matter is captured and some passes through the flow through channels. 17. A partial wall-flow filter, comprising: a plurality of porous walls forming channels wherein some of the channels are plugged channels and some are unplugged flow-through channels, wherein the plugged channels include some channels at or near the center of the filter that are plugged adjacent to an inlet end of the filter and other channels at or near the center of the filter that are plugged adjacent to an outlet end of the filter, a number of channels plugged adjacent to the outlet end is less than a number of channels that are plugged adjacent to the inlet end, and the porous walls further comprise:t wall≦305 μm,MPD≦20 μm,% P≧50%, andCD≧250 cpsiwherein t wall is the transverse thickness of the porous walls, MPD is a mean pore diameter of the porous walls, % P is the total porosity of the porous walls, and CD is the cell density of the channels.
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