An exhaust gas purifying system (100) includes: a NOx purifying catalyst (34) that is disposed in an exhaust gas flow path (3) to purify nitrogen oxide; and an HC generator (33, 133) that is disposed upstream of the NOx purifying catalyst (34) in the exhau...

A method of enhancing the operation of an emissions after treatment system in a fuel combustion system involves supplying a fuel comprising an additive (preferably manganese compound) to the system, combusting the fuel to produce at least one byproduct com...