NH3 formation over a lean NOX trap (LNT) system: Effects of lean/rich cycle timing and temperature

- Below 300 °C NOX release and reduction are slow and kinetically limiting.
- Above 450 °C NOX storage becomes the limiting factor.
- Selectivities to NH3 and N2O are primarily functions of temperature.
- Selectivities to NH3 and N2O decrease with increasing temperature.
- Cycle timing affects both NOX conversion and NH3 yield.