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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.:

US 9259684 B1

PDFFull Text
Date of Patent:
Feb. 16, 2016

Filed:

Dec. 11, 2012

Exhaust system for a lean-burn internal combustion engine including scr catalyst

Applicant:

Johnson Matthey Public Limited Company, London, GB;

Inventors:

Philip Gerald Blakeman, Philadelphia, PA (US);

Gavin Michael Brown, Saffron Walden, GB;

Andrew Francis Chiffey, Ware, GB;

Jane Gast, Spring City, PA (US);

Paul Richard Phillips, Royston, GB;

Raj Rao Rajaram, Slough, GB;

Glen Spreitzer, Collegeville, PA (US);

Andrew Peter Walker, High Wycombe, GB;

Assignee:

Johnson Matthey Public Limited Company, London, GB;

Attorney:

Gary D. Mangels

Primary Examiner:

Colleen Dunn

Assistant Examiner:

Haytham Soliman

Int. Cl.
CPC ...
B01J 23/58 (2006.01); B01D 53/94 (2006.01); B01J 35/00 (2006.01); F01N 3/20 (2006.01); F01N 3/28 (2006.01); B01J 37/02 (2006.01); B01J 37/03 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01); B01J 23/72 (2006.01); B01J 29/76 (2006.01); B01J 35/04 (2006.01); B01J 37/00 (2006.01); F01N 13/00 (2010.01); F01N 3/035 (2006.01); B01J 23/63 (2006.01); B01J 23/83 (2006.01); B01J 29/85 (2006.01);
U.S. Cl.
CPC ...
B01D 53/9477 (2013.01); B01D 53/9472 (2013.01); B01J 23/42 (2013.01); B01J 23/44 (2013.01); B01J 23/72 (2013.01); B01J 29/763 (2013.01); B01J 29/7615 (2013.01); B01J 35/0006 (2013.01); B01J 35/04 (2013.01); B01J 37/0036 (2013.01); B01J 37/0215 (2013.01); B01J 37/0246 (2013.01); B01J 37/038 (2013.01); F01N 3/2066 (2013.01); F01N 3/2803 (2013.01); F01N 13/009 (2014.06); B01D 53/944 (2013.01); B01D 53/9418 (2013.01); B01D 2255/1021 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/20761 (2013.01); B01J 23/63 (2013.01); B01J 23/83 (2013.01); B01J 29/85 (2013.01); B01J 2229/186 (2013.01); F01N 3/035 (2013.01); F01N 2370/00 (2013.01); F01N 2510/0682 (2013.01); F01N 2610/02 (2013.01); Y02T 10/24 (2013.01);
Abstract

An exhaust systemfor an internal combustion engine comprises a) a first catalysed substrate monolithcomprising a first washcoat coating disposed in a first washcoat zoneof the substrate monolith and a second washcoat coating disposed in a second washcoat zoneof the substrate monolith, wherein the first washcoat coating comprises a catalyst composition comprising at least one platinum group metal (PGM) and at least one support material, wherein at least one PGM in the first washcoat coating is liable to volatilise when the first washcoat coating is exposed to relatively extreme conditions including relatively high temperatures, wherein the second washcoat coating comprises at least one material supporting copper for trapping volatilised PGM and wherein the second washcoat coating is oriented to contact exhaust gas that has contacted the first washcoat; and b) a second catalysed substrate monolithcomprising a catalyst for selectively catalysing the reduction of oxides of nitrogen to dinitrogen with a nitrogenous reductant disposed downstream from the first catalysed substrate monolith.

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