US 12,291,987 B2
Exhaust treatment method and apparatus having particulate filters and SCR
Douglas Munroe Beall, Painted Post, NY (US); Sam George, Naperville, IL (US); Mahesh Govindareddy, Painted Post, NY (US); and Achim Karl-Erich Heibel, Corning, NY (US)
Assigned to Corning Incorporated, Corning, NY (US)
Appl. No. 18/284,430
Filed by CORNING INCORPORATED, Corning, NY (US)
PCT Filed Apr. 5, 2022, PCT No. PCT/US2022/023413
§ 371(c)(1), (2) Date Sep. 27, 2023,
PCT Pub. No. WO2022/216658, PCT Pub. Date Oct. 13, 2022.
Claims priority of provisional application 63/315,334, filed on Mar. 1, 2022.
Claims priority of provisional application 63/291,573, filed on Dec. 20, 2021.
Claims priority of provisional application 63/171,454, filed on Apr. 6, 2021.
Claims priority of provisional application 63/170,823, filed on Apr. 5, 2021.
Prior Publication US 2024/0159174 A1, May 16, 2024
Int. Cl. F01N 3/022 (2006.01); B01D 46/24 (2006.01); B01D 46/62 (2022.01); B01D 53/94 (2006.01); F01N 3/023 (2006.01); F01N 3/029 (2006.01); F01N 3/08 (2006.01); F01N 3/20 (2006.01); F01N 13/00 (2010.01)
CPC F01N 3/0222 (2013.01) [B01D 46/24491 (2021.08); B01D 46/24492 (2021.08); B01D 46/2484 (2021.08); B01D 46/62 (2022.01); B01D 53/9431 (2013.01); F01N 3/2066 (2013.01); F01N 13/009 (2014.06); B01D 46/2418 (2013.01); B01D 46/2425 (2013.01); B01D 46/2429 (2013.01); B01D 53/9418 (2013.01); B01D 53/9422 (2013.01); B01D 2251/2067 (2013.01); B01D 2258/01 (2013.01); B01D 2279/30 (2013.01); F01N 3/023 (2013.01); F01N 3/0231 (2013.01); F01N 3/029 (2013.01); F01N 3/0814 (2013.01); F01N 3/0871 (2013.01); F01N 3/206 (2013.01); F01N 3/208 (2013.01); F01N 2330/06 (2013.01); F01N 2330/48 (2013.01); F01N 2610/1453 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An exhaust treatment apparatus for treating an exhaust stream flowing through an exhaust line housing in a downstream direction from an upstream location of the exhaust line housing to a downstream location, the exhaust treatment apparatus comprising:
a first particulate filter;
an SCR unit disposed downstream of the first particulate filter; and
a second particulate filter disposed downstream of the SCR unit;
wherein the first particulate filter, the SCR unit, and the second particulate filter are disposed serially in the exhaust line housing and are configured to allow the exhaust stream to flow serially through the first particulate filter, subsequently through the SCR unit, and subsequently through the second particulate filter wherein the first particulate filter is comprised of a first honeycomb body comprised of intersecting porous ceramic walls comprising a first bulk average porosity of 40-65% as measured by mercury porosimetry, and the second particulate filter is comprised of a second honeycomb body comprised of intersecting porous ceramic walls comprising a second bulk average porosity of 35-55% as measured by mercury porosimetry.