US 11,865,497 B2
Monometallic rhodium-containing four-way conversion catalysts for gasoline engine emissions treatment systems
Janosch Cravillon, Hannover (DE); Stephan Siemund, Pattensen (DE); Attilio Siani, Shanghai (CN); Thomas Schmitz, Wunstorf (DE); and Markus Kinne, Hannover (DE)
Assigned to BASF Corporation, Florham Park, NJ (US)
Filed by BASF Corporation, Florham Park, NJ (US)
Filed on Oct. 29, 2021, as Appl. No. 17/452,826.
Application 17/452,826 is a continuation of application No. 16/323,148, granted, now 11,185,819, previously published as PCT/EP2017/068775, filed on Jul. 25, 2017.
Claims priority of application No. 16182969 (EP), filed on Aug. 5, 2016.
Prior Publication US 2022/0118405 A1, Apr. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 21/04 (2006.01); B01J 21/12 (2006.01); B01J 23/46 (2006.01); B01J 23/63 (2006.01); B01J 35/00 (2006.01); B01J 35/04 (2006.01); B01J 35/10 (2006.01); F01N 3/035 (2006.01); F01N 3/10 (2006.01); B01D 53/94 (2006.01); B01J 37/02 (2006.01)
CPC B01D 53/945 (2013.01) [B01D 53/9477 (2013.01); B01J 23/464 (2013.01); B01J 23/63 (2013.01); B01J 35/0006 (2013.01); B01J 35/04 (2013.01); B01J 35/108 (2013.01); B01J 37/0244 (2013.01); F01N 3/035 (2013.01); F01N 3/101 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/2065 (2013.01); B01D 2255/407 (2013.01); B01D 2255/908 (2013.01); B01D 2255/9155 (2013.01); B01D 2258/014 (2013.01); F01N 2330/06 (2013.01); F01N 2510/06 (2013.01); F01N 2510/068 (2013.01); F01N 2510/0684 (2013.01); Y02T 10/12 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust stream comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates, the emission treatment system comprising:
a close-coupled three-way conversion (TWC) composite comprising a first TWC catalytic material supported on a flow-through substrate; and
a catalyzed particulate filter located downstream of the dose-coupled TWC composite, the catalyzed particulate filter comprising a second TWC catalytic material that permeates walls of a particulate filter,
wherein the second TWC catalytic material comprises rhodium as the only platinum group metal, a support, and an oxygen storage component,
wherein the catalyzed particulate filter has a coated porosity ranging from 75% to 98% of an uncoated porosity of the particulate filter.