Low temperature catalytic performance of coal-fired flue gas oxidation over Mn-Co-Ce-Ox

A series of Mn-Co-Ce-O-x were prepared using co-precipitation method and tested for low temperature catalytic oxidation of NO and CO with O-2. The best catalytic result was obtained by Mn0.2Co0.3Ce0.5 catalyst, which yielded 100% NO and CO conversion at 185 degrees C and 105 degrees C under space velocity at 60,000 h(-1) respectively. XRD, BET, TEM, H-2-TPR, XPS and Raman were used for the structure and redox properties investigation of mixed oxide. The catalyst characterization suggested that the high catalytic oxidation performance was attributed to dual redox cycles (Mn3+ + Co3+ <-> Mn4+ + Co2+, Mn3+ + Ce4+ <-> Mn4+ + Ce3+). In the SO2 and H2O poisoning test, 67% of NO converted to NO2 over the Mn0.3Co0.2Ce0.5 catalysts and recovered to 82% quickly, which displayed high resistance against H2O and SO2. The catalyst shows good stability between 24 h test. (C) 2017 Elsevier Ltd. All rights reserved.