Development of a System Level Soot-NOx Trap Aftertreatment Device Model

A Soot-NO_x Trap (SNT) is a combinatorial aftertreatment device intended to decrease both particulate and NO_x emissions simultaneously. A system-level Soot-NO_x Trap model was developed by adding Lean NO_x Trap kinetics to a 1D Diesel Particulate Filter model. The hybrid model was validated against each parent model for the limiting cases, then exercised to investigate the interacting redox behavior. Modulations in temperature and exhaust air-fuel ratio were investigated for their ability to facilitate particulate oxidation and NO_x reduction in the trap.