The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2018
Filed:
Sep. 16, 2014
Applicant:
Johnson Matthey Public Limited Company, London, GB;
Inventor:
Daniel Swallow, Bedfordshire, GB;
Assignee:
Johnson Matthey Public Limited Company, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01N 3/00 (2006.01); F01N 3/20 (2006.01); F01N 3/08 (2006.01); F01N 3/035 (2006.01); F01N 13/00 (2010.01); B01D 53/94 (2006.01);
U.S. Cl.
CPC ...
F01N 3/208 (2013.01); B01D 53/9418 (2013.01); B01D 53/9481 (2013.01); F01N 3/035 (2013.01); F01N 3/0807 (2013.01); F01N 3/0842 (2013.01); F01N 3/0885 (2013.01); F01N 13/009 (2014.06); B01D 53/9431 (2013.01); B01D 2255/20707 (2013.01); B01D 2255/20723 (2013.01); B01D 2255/20738 (2013.01); B01D 2255/20761 (2013.01); B01D 2255/20776 (2013.01); B01D 2255/502 (2013.01); B01D 2255/504 (2013.01); F01N 3/0814 (2013.01); F01N 2370/02 (2013.01); F01N 2430/085 (2013.01); F01N 2510/06 (2013.01); F01N 2610/02 (2013.01); Y02A 50/2325 (2018.01); Y02T 10/24 (2013.01);
Abstract
An exhaust system for treating an exhaust gas from an internal combustion engine is disclosed. The system comprises a modified lean NOtrap (LNT), a urea injection system, and an ammonia-selective catalytic reduction (NH-SCR) catalyst. The modified LNT comprises platinum, palladium, barium, and a ceria-containing material, and has a platinum:palladium molar ratio of at least 3:1. The modified LNT stores NOat temperatures below about 200° C. and releases the stored NOat temperatures above about 200° C. The urea injection system injects urea at temperatures above about 180° C.