US 11,885,251 B2
Selective catalytic reduction catalyst pre-heating burner assembly and method of controlling burner emissions
Thomas M. Harris, Dexter, MI (US); and Matthew G. Muhleck, Dansville, MI (US)
Assigned to Tenneco Automotive Operating Company Inc., Northville, MI (US)
Filed by Tenneco Automotive Operating Company Inc., Lake Forest, IL (US)
Filed on May 25, 2022, as Appl. No. 17/824,229.
Prior Publication US 2023/0383681 A1, Nov. 30, 2023
Int. Cl. F01N 3/20 (2006.01); F01N 3/10 (2006.01); F01N 3/28 (2006.01); F01N 3/36 (2006.01); B01J 35/04 (2006.01); B01J 23/42 (2006.01); B01D 53/94 (2006.01); B01D 39/12 (2006.01); B01D 46/24 (2006.01); B01D 46/52 (2006.01); F01N 3/025 (2006.01)
CPC F01N 3/2033 (2013.01) [B01D 39/12 (2013.01); B01D 46/2403 (2013.01); B01D 46/521 (2013.01); B01D 53/945 (2013.01); B01D 53/9418 (2013.01); B01D 53/9477 (2013.01); B01J 23/42 (2013.01); B01J 35/04 (2013.01); F01N 3/101 (2013.01); F01N 3/2066 (2013.01); F01N 3/2828 (2013.01); F01N 3/2842 (2013.01); F01N 3/36 (2013.01); B01D 2239/1208 (2013.01); B01D 2255/102 (2013.01); B01D 2255/908 (2013.01); B01D 2255/9155 (2013.01); B01D 2279/30 (2013.01); F01N 3/025 (2013.01); F01N 3/0253 (2013.01); F01N 3/0256 (2013.01); F01N 3/204 (2013.01); F01N 2240/14 (2013.01); F01N 2370/02 (2013.01); F01N 2610/03 (2013.01); F01N 2610/08 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/16 (2013.01); F01N 2900/1824 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An exhaust system for a vehicle, comprising:
an exhaust pipe section defining a main exhaust passageway therein;
a selective catalytic reduction (SCR) catalyst arranged in fluid communication with and positioned downstream of the exhaust pipe section; and
a burner assembly connected to the exhaust pipe section, the burner assembly including a burner with a combustion chamber disposed therein, an igniter for initiating fuel combustion in the combustion chamber, and a connecting tube extending between an outlet of the combustion chamber and the exhaust pipe section,
wherein the connecting tube includes an inner surface defining a connecting tube passageway that is arranged in fluid communication with the combustion chamber of the burner and the main exhaust passageway in the exhaust pipe section,
wherein a catalytic washcoat is disposed on the inner surface of the connecting tube, the catalytic washcoat comprising a mixture of a support material and a catalyst material made of one or more platinum group metals (PGM) that chemically react with emissions generated by the burner.