System and method for removing NOx from an emission control device

A method for removing NOx from an emission control device receiving exhaust gases from an engine, the emission control device being coupled adjacent and downstream of an oxidation catalyst, the method comprising:

• adding hydrocarbons to said exhaust gases flowing into said oxidation catalyst, wherein an amount of reductant to add to said exhaust gases is determined based on an amount of exhaust gases flowing into said oxidation catalyst;
• partially oxidizing said hydrocarbons in said oxidation catalyst to cause a remaining portion of said hydrocarbons to transition to a vapor phase;
• and,
• oxidizing said remaining portion of said hydrocarbons in said emission control device to remove NOx from said device.

A system for removing NOx from an emission control device receiving exhaust gases from an engine, the system comprising:

• an oxidation catalyst receiving exhaust gases from said engine, said oxidation catalyst coupled adjacent and upstream of said emission control device;
• a valve selectively supplying reductant to said exhaust gases flowing into said oxidation catalyst responsive to a first signal;
• and,
• a controller operably connected to said valve, said controller generating said first signal to add said reductant to said exhaust gases flowing into said oxidation catalyst, wherein said controller is further configured to determine an amount of reductant to add to said exhaust gases based on an amount of exhaust gases flowing into said oxidation catalyst, said oxidizing catalyst partially oxidizing said reductant to obtain a remaining portion of said reductant in a vapor phase, said device oxidizing said remaining portion of said reductant to remove NOx from said device.