A Highly Effective MnNdOx Catalyst for the Selective Catalytic Reduction of NO x with NH 3

Nd was used as the modifier to improve the NH 3 -selective catalytic reduction (SCR) performance of MnO x catalyst used in NO x abatement. The results of the activity test indicated that MnNdO x -0.1 catalyst displayed remarkable catalytic activity and N 2 selectivity in the temperature range of 50–300 °C. Characterization results proved the enhanced reducibility and the facilitated NH 3 and NO x adsorption over MnNdO x -0.1 catalyst, accompanied by the existence of more Mn 4+ and surface adsorbed oxygen species over its surface. The results of the in situ diffuse reflectance infrared Fourier transform study pointed out that the NH 3 -SCR reaction over the MnNdO x -0.1 catalyst was mainly under the control of the Langmuir–Hinshelwood mechanism (≤100 °C); when the reaction temperature was over 200 °C, the Eley–Rideal mechanism was dominant. More adsorbed NO x and NH 3 species over the MnNdO x -0.1 catalyst, along with the activation effect of Nd on the adsorbed reactants, had a facilitation impact on the SCR reaction process over the MnNdO x -0.1 catalyst.