A study on reductants pulse supply to a NH₃-SCR catalysttoward NOx conversion improvement and reductants reduction (First Report)

- Improvement of NOx conversion ratio -

Abstract

In this study, the active control of reductant pulse supply was investigated using the SCR reaction model to improve the NOx purification ratio and reduce the amount of reductant supply in a urea-SCR catalyst system. The improvement was obtained when the active control of amplitude and frequency of NH₃ pulse supply was carried out at low temperature. In this case, it was important to increase the ammonia coverage while suppressing the formation of ammonium nitrate.