MnOx/Ce0.6Zr0.4O2 Catalysts for Low-Temperature Selective Catalytic Reduction of NOx with NH3

摘要

Innovative catalysts of manganese oxides supported on Ce0.6Zr0.4O2 prepared by different methods (e.g., citricnacid method, coprecipitation method, and combustion method) were studied for low-temperature selectivencatalytic reduction of NOx with NH3 at 808C–2608C. Compared with MnOx/Ce0.6Zr0.4O2 (coprecipitationnmethod) and MnOx/Ce0.6Zr0.4O2 (combustion method), MnOx/Ce0.6Zr0.4O2 (citric acid method) exhibited thenbest performance on selective catalytic reduction activity even in the presence of H2O and SO2. X-ray diffraction,nN2 adsorption, X-ray photoelectron spectroscopy, and temperature-programmed experiments (H2-TPR andnNH3-TPD) were used to characterize properties of the catalysts. Large surface area, small crystalline size, highnsurface chemisorbed oxygen, and high dispersion of manganese oxides might be the main reasons for thenexcellent performance of the catalysts.