Innovative catalysts of manganese oxides supported on Ce0.6Zr0.4O2 prepared by different methods (e.g., citric acid method, coprecipitation method, and combustion method) were studied for low-temperature selective catalytic reduction of NOx with NH3 at 80°C–260°C. Compared with MnOx/Ce0.6Zr0.4O2 (coprecipitation method) and MnOx/Ce0.6Zr0.4O2 (combustion method), MnOx/Ce0.6Zr0.4O2 (citric acid method) exhibited the best performance on selective catalytic reduction activity even in the presence of H2O and SO2. X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, and temperature-programmed experiments (H2-TPR and NH3-TPD) were used to characterize properties of the catalysts. Large surface area, small crystalline size, high surface chemisorbed oxygen, and high dispersion of manganese oxides might be the main reasons for the excellent performance of the catalysts.
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