Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Christine Kay Lambert0
Joseph Robert Theis0
Douglas Allen Dobson0
Date of Patent
May 23, 2017
0Patent Application Number
147147570
Date Filed
May 18, 2015
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An exhaust system for a diesel engine is disclosed. The exhaust system may include a diesel oxidation catalyst (DOC) configured to receive exhaust gases from the engine and oxidize hydrocarbons in the exhaust gases and a passive NOx adsorber (PNA) downstream from the DOC and configured to store NOx from the exhaust gases at temperatures up to 150° C. A selective catalytic reduction (SCR) system may be downstream from the PNA and configured to reduce NOx in the exhaust gases. The PNA may be configured to release the stored NOx at temperatures above 200° C. The DOC upstream of the PNA may reduce the amount of N2O that is generated by the PNA by oxidizing hydrocarbons before they reach the PNA.
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