Research progress of Mn-based low-temperature SCR denitrification catalysts.

15 prepared different valence states of MnO X , and the activity per unit of surface area was in the order of MnO 2 , Mn 5 O 8 , Mn 2 O 3 , Mn 3 O 4 and MnO, which showed a decreasing trend in the activity per unit surface area with decreasing Mn valence, resulting in the different valence states of MnO X exhibiting different efficiencies in removing NO X ([NO] = 500 ppm, [NH 3 ] = 550 ppm, [O 2 ] = 2 vol%, He as the balanced gas, T = 112–302 °C and flow rate = 50 cm 3 (STP) min −1 ).

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