| 초록 |
Marine SCR catalyst requires higher DeNOx activity in the low temperature range comparing to automobile. In this study, we aimed at finding the optimum condition to prepare V2O5/TiO2 catalyst known as low temperature SCR catalysts by changing oxidation states in vanadium precursor solution. V2O5 catalysts supported by TiO2 (1, 3, 5 and 7 wt.%) were prepared by applying wet impregnation method using three precursor solutions with different oxidation states (V3+, V4+ and V5+). We utilized BET, ICP, XRD, Raman spectroscopy, XPS, UV-vis DRS and H2-TPR to investigate the physicochemical properties catalysts. Also, NH3-SCR reaction test was performed for these catalysts. It was found that V2O5/TiO2 catalysts prepared from the precursor solution of V3+ oxidation state (VT(3+)) was the most active and selective to N2 production simultaneously, produced the least amount of N2O. The formation of highly coordinated polymeric vanadyl species on the sample attributes the highest NOx conversion and N2 selectivity of the VT(3+) catalyst. |
