US 11,808,188 B2
Particulate filter
Ryo Tasaki, Kakegawa (JP); Ryota Onoe, Kakegawa (JP); Momoko Iwai, Kakegawa (JP); and Yamato Matsushita, Kakegawa (JP)
Assigned to Cataler Corporation, Kakegawa (JP)
Appl. No. 17/618,082
Filed by Cataler Corporation, Kakegawa (JP)
PCT Filed Jun. 26, 2020, PCT No. PCT/JP2020/025265
§ 371(c)(1), (2) Date Dec. 10, 2021,
PCT Pub. No. WO2020/262623, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-119019 (JP), filed on Jun. 26, 2019.
Prior Publication US 2022/0316372 A1, Oct. 6, 2022
Int. Cl. F01N 3/022 (2006.01); B01D 46/82 (2022.01); B01D 46/24 (2006.01); B01D 53/94 (2006.01); B01J 21/04 (2006.01); B01J 23/02 (2006.01); B01J 23/58 (2006.01); B01J 35/00 (2006.01); B01J 35/04 (2006.01); F01N 3/035 (2006.01); F01N 3/023 (2006.01); F01N 9/00 (2006.01); F01N 3/021 (2006.01); F01N 3/025 (2006.01); F01N 3/28 (2006.01)
CPC F01N 3/022 (2013.01) [B01D 46/2474 (2013.01); B01D 46/82 (2022.01); B01D 53/94 (2013.01); B01J 21/04 (2013.01); B01J 23/02 (2013.01); B01J 23/58 (2013.01); B01J 35/0006 (2013.01); B01J 35/04 (2013.01); F01N 3/035 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/9022 (2013.01); B01D 2255/9155 (2013.01); B01D 2279/30 (2013.01); F01N 3/021 (2013.01); F01N 3/023 (2013.01); F01N 3/0253 (2013.01); F01N 3/2882 (2013.01); F01N 9/002 (2013.01); F01N 2250/02 (2013.01); F01N 2330/06 (2013.01); F01N 2370/24 (2013.01); F01N 2510/063 (2013.01); F01N 2510/0682 (2013.01); F01N 2510/0684 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A particulate filter suitable for collecting particulate matter in exhaust gas emitted from an internal combustion engine, the particulate filter being disposed in an exhaust passage of the internal combustion engine, the particulate filter comprising:
a wall-flow structure substrate including
an inlet cell open only at an exhaust gas inflow end,
an outlet cell adjacent to the inlet cell and open only at an exhaust gas outflow end, and
a porous partition that partitions the inlet cell and the outlet cell; and
a wash coat layer formed inside the partition, wherein the wash coat layer includes:
an inlet layer having a predetermined thickness from a surface of the partition in contact with the inlet cell toward an inner side of the partition and having a predetermined length along an extending direction of the partition from near the exhaust gas inflow end; and
an outlet layer having a predetermined thickness from a surface of the partition in contact with the outlet cell toward the inner side of the partition and having a predetermined length along the extending direction of the partition from near the exhaust gas outflow end,
the thicknesses and the lengths of the inlet layer and the outlet layer are set such that the inlet layer and the outlet layer partially overlap each other,
the inlet layer contains a precious metal catalyst that promotes combustion of the particulate matter, while the outlet layer contains substantially no precious metal catalyst, and
assuming that a total length of the partition in the extending direction is 100%, the inlet layer exists in a region of 50% or more and 75% or less from near the exhaust gas inflow end.