公开(公告)号：US20230383681A1

公开(公告)日：2023-11-30

申请号：US17824229

申请日：2022-05-25

申请人： Tenneco Automotive Operating Company Inc.

发明人： Thomas M. HARRIS ,  Matthew G. MUHLECK

IPC分类号： F01N3/20 ,  F01N3/10 ,  F01N3/28 ,  F01N3/36 ,  B01J35/04 ,  B01J23/42 ,  B01D53/94 ,  B01D39/12 ,  B01D46/24 ,  B01D46/52

CPC分类号： F01N3/2033 ,  F01N3/2066 ,  F01N3/101 ,  F01N3/2828 ,  F01N3/2842 ,  F01N3/36 ,  B01J35/04 ,  B01J23/42 ,  B01D53/9418 ,  B01D39/12 ,  B01D46/2403 ,  B01D46/521 ,  B01D53/945 ,  B01D53/9477 ,  F01N2370/02 ,  F01N2610/1453 ,  B01D2239/1208 ,  B01D2279/30 ,  B01D2255/9155 ,  B01D2255/908 ,  B01D2255/102

摘要： A vehicle exhaust system including an exhaust pipe section, a selective catalytic reduction (SCR) catalyst, and a burner assembly, connected to the exhaust pipe section at a position upstream of the selective catalytic reduction (SCR) catalyst, for pre-heating the exhaust system prior to engine start-up. The burner assembly includes a burner with a combustion chamber and a connecting tube that extends between the burner and the exhaust pipe section. A metallic mesh filter element is located inside the connecting tube and/or a catalytic washcoat is disposed on an inner surface of the connecting tube to reduce emissions of the burner assembly at start-up. The catalytic washcoat comprises a mixture of a support material and a catalyst material that chemically reacts with emissions generated by the burner to reduce the amount of burner produced emissions released from the exhaust system during pre-heating.