Abstract
A series of MnOx-CeO2/graphene catalysts prepared by a hydrothermal method with different molar ratios of Mn/Ce active components were loaded on graphene for low-temperature SCR of NOx with NH3. Experimental results indicated that these catalysts exhibited excellent low-temperature SCR activities and strong resistance against SO2. The characterization results indicated that manganese and cerium oxides dispersed on the surface of graphene uniformly, and that manganese oxide existed in different forms of crystallinities (MnO, Mn3O4, and MnO2). The MnOx-CeO2(8:1)/GR displayed superior activity, high N2 selectivity, and good resistance to H2O and SO2, which would be very attractive for the application in controlling NOx emission from flue gas. Its excellent catalytic performance and SO2 tolerance at low temperature were attributed to the high content of manganese with high oxidation valence, increased chemisorbed oxygen on the surface, more active sites, and the strong interaction between MnOx-CeO2 active sites and graphene support.
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