System and method for exhaust gas after treatment

摘要

A hydrocarbon selective catalytic reduction (HC-SCR) catalyst is regenerated using a nitrogen-based reductant agent. The HC-SCR catalyst is in communication with a power system such as an internal combustion engine and receives exhaust gasses from the internal combustion engine. Sulfur in the exhaust gasses may deactivate the HC-SCR catalyst by sulfur oxides forming thereon. To remove the sulfur oxides, a nitrogen-based reductant agent is introduced to the exhaust gasses. The nitrogen-based reductant agent decomposes to nitrogen oxides and hydrogen. The hydrogen reacts with the sulfur oxides to form hydrogen sulfides thereby removing the sulfur oxides from the HC-SCR catalyst.

主权项

1. A selective catalytic reduction system for use with a power system, the selective catalytic reduction system comprising:
an exhaust system in fluid communication with the power system and directing exhaust gasses from the power system; an hydrocarbon selective catalytic reduction (HC-SCR) catalyst for hydrocarbon selective catalytic reduction disposed in the exhaust system, the HC-SCR catalyst including a catalytic material for reducing a portion of nitrogen oxides present in the exhaust gasses; a nitrogen-based reductant agent storage tank for storing a nitrogen-based reductant agent; and a nitrogen-based agent injector disposed in the exhaust system and in fluid communication with the nitrogen-based reductant agent storage tank to introduce the nitrogen-based reductant agent to the exhaust gasses.