Selective catalytic reduction of NOx with NH3 over Mn-Ce mixed oxide catalyst at low temperatures

A series of Mn-Ce mixed oxide catalysts with different molar ratio of Mn/Ce were prepared by the surfactant template (ST) method and conventional co-precipitation (CP) method for the selective catalytic reduction of NOx with ammonia (NH3-SCR) at low temperatures. Catalyst preparation method exerts significant influence on the catalytic performance, and Mn-Ce mixed oxide catalyst prepared by ST method is more active than that prepared by CP method. The best Mn-Ce mixed oxide catalyst prepared by ST method yielded nearly 100% NOx conversion in the temperature range of 100-200 degrees C. Moreover, its resistance against H2O and SO2 is higher. The high surface area of Mn-Ce mixed oxide catalyst prepared by the ST method could contribute to the adsorption and activation of NH3 as well as NOx, thus promoting the NOx reduction to proceed. (C) 2013 Elsevier B.V. All rights reserved.