A Study on the NH3-SCR Activity of the VWSbTi According to the Calcination Temperature of WSbTi

In this study, an experiment was performed by adding Sb during NH3-selective catalytic reduction (NH3-SCR) while varying calcination temperatures from 400 to 700 degrees C to improve the low temperature denitrification efficiency of VWTi catalyst. As a result, VWSbTi(500) and VWSbTi(600) catalysts corresponding to Sb calcination temperatures of 500-600 degrees C showed the best denitrification performance at low temperatures below 300 degrees C. BET, XRD, Raman, XPS, H-2-TPR, and NH3-TPD analyses were performed In order to confirm physicochemical properties according to the calcination temperature. In the case of VWSbTi(500) and VWSbTi(600), an acid site increased with the generation of W-O species, and superb activity at low temperatures was exhibited due to the excellent redox characteristics and increase in electron density of tungsten. Furthermore, in the case of VWSbTi(700), as the crystalline V2O5 structure was formed, the denitrification efficiency decreased. Thus the optimum calcination temperature during Sb addition process was confirmed.