AFTERTREATMENT SYSTEMS WITH REDUCED N2O GENERATION

摘要

Systems, apparatus and methods are disclosed for reducing the amount of nitrous oxide (N2O) produced in a selective catalytic reductant (SCR) catalyst in an exhaust aftertreatment system. The SCR catalysts are arranged to reduce the amount of N2O produced during NOx reduction while not adversely affecting NOx conversion.

主权项

1. A system, comprising:
an internal combustion engine having an exhaust aftertreatment system for receiving an exhaust gas produced from operation of the internal combustion engine; a reductant system including a reductant source; and a diesel exhaust aftertreatment system that includes at least one selective catalytic reduction (SCR) catalyst positioned downstream of a connection of the reductant source to the exhaust aftertreatment system, wherein the at least one SCR catalyst includes at least two formulations on portions of the SCR catalyst, the at least two formulations including a first formulation and a second formulation, wherein the first formulation produces less N2O during NOx reduction by the SCR catalyst than the second formulation.