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A series of N-doped graphene (NG) and TiO 2  supported MnOx–CeO 2  catalysts were prepared by a hydrothermal method. The catalysts with different molar ratios of Mn/Ce (6: 1, 10: 1, 15: 1) were investigated for the low-temperature selective catalytic reduction (SCR) of NO x with NH 3 . The synthesized catalysts were characterized by HRTEM, SEM, XRD, BET, XPS, and NH3-TPD technologies. The characterization results indicated that manganese and cerium oxide particles dispersed on the surface of the TiO 2 –NG support uniformly, and that manganese and cerium oxides existed in different valences on the surface of the TiO 2 –NG support. At Mn element loading of 8 wt%, MnO x –CeO 2 (10: 1)/TiO 2 –1%NG displayed superior activity and improved SO 2  resistance. On the basis of the catalyst characterization, excellent catalytic performance and SO 2  tolerance at low temperature were attributed to the high content of manganese with high oxidation valence, extensive oxidation of NO into NO 2  by CeO 2  and strong NO adsorption capacity, and electron transfer of N-doped graphene.

N-doped graphene and TiO2 supported manganese and cerium oxides on low-temperature selective catalytic reduction of NOx with NH3