| 초록 |
Recently, N2O, whose greenhouse effect is 310 times larger than CO2, has been issued due to the new regulatory trend. The formation of N2O has been observed in the selective catalytic reduction (SCR) system as a function of side reaction, especially at higher temperature than 300oC. In this study, we aimed at finding the proper promoter of V2O5/TiO2 catalyst with excellent deNOx activity and minimized N2O formation by changing the various parameters such as promoters and the order of impregnation. 5 wt% V2O5/TiO2 catalyst was prepared by applying wet impregnation method using vanadium precursor with V3+ state. Although W promoted V2O5/TiO2 catalysts showed the highest NOx conversion over all temperature range, the formation of N2O during SCR reaction exceeded reference catalyst (V2O5/TiO2) especially above 350oC. However, Mn and Zr promoted V2O5/TiO2 catalysts demonstrated least N2O formation as well as excellent NOx conversion above 350oC. In addition, impregnating vanadium first then promoter later showed the least production of N2O during SCR reaction. |
