Conversion of CaTi1-xMnxO3-δ-Based Photocatalyst for Photocatalytic Reduction of NO via Structure-Reforming of Ti-bearing Blast Furnace Slag

In this work, a novel low-cost and robust approach is developed to covert Ti-bearing blast furnace slag (Ti-slag) to the main feed stock of photoassisted NH3 selective catalytic reduction (Photo NH3-SCR) of NO with high performance. The CaTi1–xMnxO3−δ catalyst was directly extracted from the Ti-bearing slag with MnO2 in situ modification and Na2CO3 reformation followed by dilute hydrochloric acid leaching and water washing. Various methods were employed to characterize the structure changes of the slag in the preparation processes of MnO2 in situ doping, Na2CO3 reforming, and leaching. Mn element can be incorporated into the perovskite CaTiO3 with 0.16 to 1.79 wt % depending on the amount of MnO2 added in Ti-slag at 1500 °C. It is interesting to note that the amount of Mn incorporated into the perovskite decreases remarkably with increasing the additional amount of MnO2 in the in situ doped modification, which reaches a maximum of 9.54 wt % for the reformed slag of 5 wt % MnO2 addition. Moreover, most of ...