| 초록 |
One of recent spotlighted issue is particulate matter which also generated from gaseous pollutants and NOx occupies the largest proportion among them. A commonly abatement technology of NOx is selective catalytic reduction with NH3 (NH3-SCR) as reductant, and vanadium-based catalyst is commercialized with titanium dioxides (TiO2) and tungsten as promoter. However up to present, because operating temperature of V-based catalyst is the range from 300 to 380 °C, the necessary of modified V-based catalyst capable of operation in the lower and wider temperature due to further tighten environmental regulation in various fields in the future. According to the previous literature, vanadium exhibits four common oxidation states (+5, +4, +3, and +2) having characteristic aqueous colors, among which V4+ and V3+ are the better SCR performance than general oxidation state, V5+. Therefore, the vanadyl oxidation states are main factor in modifying V-based catalyst for low temperature drive, and the SCR performance is further enhanced by deflocculated particle on porous hexagonal boron nitride (h-BN). |
