Abstract
Selective catalytic reduction (SCR) is an effective technique to reduce nitrogen oxides (NOx) from diesel engine emissions. In this study, the influence of DeNOx performance, deactivation characteristics and the ammonium bisulfate deposition on the catalyst surface by the homogeneity of the reducing agent were investigated. The results indicate that the low NOx conversion due to homogeneity deterioration is improved not by the high temperature and long reaction time but by the small NH3/NO ratio. The degradation of homogeneity inhibits the deactivation of DeNOx performance. On the other hand, it increases the NH3 slip. The ammonium bisulfate deposition depends on the local NH3/NO ratio, and it reaches a maximum value at the NH3/NO ratio of 1.0∼1.2 under a catalyst temperature condition of 250°C.
