Effect of vanadium surface density and structure in VOx/TiO_2 on selective catalytic reduction by NH_3

摘要

We investigated the correlation between vanadium surface density and VOx structure species in the selective catalytic reduction of NOx by NH3. The properties of the VOx/TiO2 catalysts were investigated using physicochemical measurements, including BET, XRD, Raman spectroscopy, FE-TEM, UV-visible DRS, NH3-TPD, H-2-TPR, O-2-On/Off. Catalysts were prepared using the wet impregnation method by supporting 1.0-3.0 wt% vanadium on TiO2 thermally treated at various calcination temperatures. Through the above analysis, we found that VOx surface density was 3.4 VOxm(2), and the optimal V loading amounts were 2.0-2.5 wt% and the specific surface area was 65-80m(2)/g. In addition, it was confirmed that the optimal VOx surface density and formation of vanadium structure species correlated with the reaction activity depending on the V loading amounts and the specific surface area size.