采用共沉淀法制备了一系列具有CrMn1.5O4晶相的新型Cr-Mn复合氧化物催化剂并用于低温有氧条件下氨选择性催化还原(SCR)NOx.结果表明,NOx转化率随着Cr/(Cr+Mn)摩尔比从0.1到0.4的增加而升高.其中Cr(0.4)-MnOx具有较高的低温活性,在140℃,空速为30 000h-1的条件下,NOx转化率可高达90%.利用N2吸附法,X射线衍射及X射线光电子能谱对系列催化剂进行了表征,发现通过添加Cr元素,可形成新型CrMn1.5O4活性物相;由于Cr元素对催化剂表面电子性能具有调变作用,Mn元素主要以高氧化态形式Mn4+及Mn3+富集,不仅可以促进对NO的氧化,而且有利于对NH3的吸附和活化,从而使该催化剂具有较好的低温SCR活性.
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