O3-assisted NH3-SCR over FeBEA catalyst at low reaction temperature

The injection of O₃ upstream to the SCR catalyst, FeBEA zeolite, significantly improves its catalytic performance at 100–200 °C. This improvement is due to the oxidation of NO by O₃, which proceeds even at ambient temperature, and to the further reduction of the NO + NO₂ mixture as a result of fast SCR, NO₂-SCR and accumulation of NH₄NO₃ on the catalyst surface.