LOW TEMPERATURE SELECTIVE CATALYTIC REDUCTION CATALYST AND ASSOCIATED SYSTEMS AND METHODS

摘要

According to one embodiment, described herein is an exhaust gas after-treatment system (120) that is coupleable in exhaust gas stream receiving communication with an internal combustion engine (110). The exhaust gas after-treatment system includes a low temperature SCR catalyst (165) configured to reduce NOx in exhaust gas having a temperature below a temperature threshold. The system also includes a normal-to-high temperature SCR catalyst (170) configured to reduce NOx in exhaust gas having a temperature above the temperature threshold.