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

Abstract 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 Mn 0.2 Co 0.3 Ce 0.5 catalyst, which yielded 100% NO and CO conversion at 185 °C and 105 °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 (Mn 3+  + Co 3+  ↔ Mn 4+  + Co 2+ , Mn 3+  + Ce 4+  ↔ Mn 4+  + Ce 3+ ). In the SO 2 and H 2 O poisoning test, 67% of NO converted to NO 2 over the Mn 0.3 Co 0.2 Ce 0.5 catalysts and recovered to 82% quickly, which displayed high resistance against H 2 O and SO 2 . The catalyst shows good stability between 24 h test.