| 초록 |
Recently, because the particulate matter (PM 2.5, 1.0, and 0.1 ) problem has worsened, this led to stronger regulation of atmospheric pollutants, and nitrogen oxides (NOx : NO, N2O, NO2, and etc.) accounts for the highest percentage ratio of gaseous contaminant for forming the particulate matter. Among the various technologies for NOx removal, selective catalytic reduction (SCR) is being used worldwide to high de-NOx efficiency with commercial catalysts of V2O5-WO3/TiO2 (VW/Ti). However, previous catalysts for SCR have narrow operating temperature in range of 350-380°C, and it is hard to adjust the diverse environmental field under atmospheric regulation. It is, therefore, tried to put niobium oxides (Nb2O5, NbO2) into VW/Ti to widen operating temperature range by means of enhanced reaction activity of adsorbed ammonia species and the improved dispersion of vanadium oxide. Hexagonal boron nitride (h-BN) was added to VWNb/Ti to decrease the amount of included Nb by improving dispersion. The catalysts were synthesized by using the impregnation method, and characterized by SEM, XRD, XRF, BET, and FT-IR. |
