Red mud-based SCR denitration catalyst as well as preparation method and application thereof

The invention discloses a red mud-based SCR denitration catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: pickling red mud to removealkali metals and alkaline earth metals in the red mud; impregnating the surface of the red mud subjected to pickling with a supported auxiliary agent, wherein the auxiliary agent is one or two of cerium nitrate, ammonium molybdate and ammonium tungstate; and after dipping, performing drying and calcining to obtain the catalyst. The denitration activity temperature window (the denitration efficiency reaches 90% or above in the temperature interval) of the red mud catalyst impregnated with Ce-Mo or Ce-W is greatly widened, the catalyst can be suitable for denitration of a high-temperature section, a medium-temperature section and a low-temperature section, and meanwhile the requirement for deep peak regulation of a current power plant can be met. 本发明公开了一种赤泥基SCR脱硝催化剂及其制备方法与应用，制备方法，包括如下步骤：对赤泥进行酸洗，去除赤泥中的碱金属和碱土金属；在酸洗后的