Manganese oxides (MnO_x) have attracted increasing attention in selective catalytic reduction of NO_x with NH₃ (NH₃-SCR) due to their excellent low-temperature catalytic activities. However, MnO_x still suffer from poor resistance to SO₂ and H₂O in NH₃-SCR. In particular, the irreversible poisoning of SO₂ limits their practical applications in NH₃-SCR. With the new regulations concerning the emission of SO₂ gas, MnO_x may be used for control over NO_x (i.e. NO and NO₂) emission in NH₃-SCR. This mini-review was devoted to challenges and opportunities of MnO_x catalysts in NH₃-SCR, which may be helpful for its practical application in NH₃-SCR system.

锰氧化物（MnO _x）由于具有出色的低温催化活性，因此在用NH ₃（NH ₃ -SCR）选择性催化还原NO _x方面引起了越来越多的关注。然而，在NH ₃ -SCR中，MnO _x仍然具有对SO ₂和H ₂ O的不良耐受性。特别地，SO ₂的不可逆中毒限制了它们在NH ₃ -SCR中的实际应用。根据有关SO ₂气体排放的新规定，MnO _x可以用于控制NH中的NO _x（即NO和NO ₂）排放₃ -SCR。这篇小型综述专门探讨了Mn _{3 x}催化剂在NH ₃ -SCR中的挑战和机遇，这可能有助于其在NH ₃ -SCR系统中的实际应用。