Abstract
In this paper, Mn-Cr mixed oxides with different structures are prepared by a co-precipitation method and used as active catalysts for low-temperature NH3 selective catalytic reduction (SCR) of NO. The Mn-Cr layered structure catalyst shows the highest activity and SO2 resistance in SCR. Furthermore, a Ce doping process on the catalyst further improves the NH3-SCR activity with SO2 resistance. The features of unique texture property, acidity, reducibility, and Mn-Cr redox cycle in the derived Mn-Cr layered structure catalyst should contribute to the improved catalytic activity for the SCR. The SO2 resistance of the catalyst is also improved by suppressing manganese sulfate formation. The improved catalytic activity and SO2 resistance due to the reducibility and sulfur resistance of Ce suggest that the Ce-doped Mn-Cr layered structure catalyst could be used as an effective catalyst for NH3-SCR.
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