MnOx-CeO 2 /graphene (MnOx-CeO 2 /GR) catalysts prepared by the hydrothermal method with different mass ratios of graphene (0-0.45 wt. %) were investigated for the low-temperature selective 35 catalytic reduction (SCR) of NOx with NH 3 . The as-prepared catalysts have been characterized systematically to elucidate their morphological structure and surface properties by XRD, SEM, TEM, BET, XPS, H 2 -TPR, NH 3 -TPD and FT-TR. It was found that the environmentally benign MnOx-CeO 2 /GR (0.3% wt %) catalyst exhibited excellent NH 3 -SCR activity and strong resistance against H 2 O and SO 2 , which is very competitive for the application in controlling the NOx emission from 40 flue gas. On the basis of the catalyst characterization, high specific surface areas, the uniform distribution of active sites, as well as the interaction of manganese and cerium oxide species, played key roles in the excellent catalytic performance of MnOx-CeO 2 /GR and resulted in improved SO 2 tolerance. 45 65
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