Patent ID: 8765623
Filing Date: 2014-07-01
Classification: B01D,B01J,C01B,F01N,Y02E,Y02P,Y02T

Abstract:
1. A method of regenerating a hydrocarbon selective catalytic reduction (HC-SCR) catalyst for a hydrocarbon selective catalytic reduction system comprising: providing an HC-SCR catalyst in communication with an internal combustion engine; directing exhaust gasses from the internal combustion engine to the HC-SCR catalyst, the exhaust gasses including sulfurs; deactivating at least in part the HC-SCR catalyst by depositing the sulfurs thereon to form sulfur oxides; introducing a nitrogen-based reductant agent to the exhaust gasses; decomposing the nitrogen-based reductant agent to nitrogen oxides and hydrogen; and removing the sulfur oxides from the HC-SCR catalyst by converting at least a portion of the sulfur oxides and the hydrogen to hydrogen sulfides.