초록 |
Selective Catalytic Reduction (SCR) technology is widely applied in various fields (boilers, power plants, automobiles, etc.) to remove nitrogen oxides (NOX) as a precursor of particulate materials (P.M. 2.5). V2O5/TiO2 based catalysts for hydrothermal aging effect remains challenging to be achieved so far because of phase transition of anatase TiO2. Additionally, at high temperatures, melting of V2O5 (above ~690 °C) or release of free V2O5 species affects SCR performance degradation. To overcome this problem, it is possible to inhibit the melting of V2O5 by forming a metal vanadate (e.g., the melting point of CeVO4 is ˜1680 °C) and use modified-TiO2 to enhance thermal stability. In this study, we demonstrated the possibility of using WO3 and SiO2 as a TiO2 supporter in CeVO4/TiO2 based catalysts to have thermal stability at high temperatures and to improve catalyst NOX reduction performance and N2 selectivity. |