A contrastive study of the introduction of cobalt as a modifier for active components and supports of catalysts for NH3-SCR

Three catalysts Mn/Ce-ZrOX, Mn-Co/Ce-ZrOX and Mn/Co-Ce-ZrOX were used for low-temperature NH3-SCR of NO. XRD, TPR and XPS were performed to characterize the physicochemical property of the catalysts. Experimental results showed that Mn/Co-Ce-ZrOX had a higher dispersion of manganese oxides, a better redox property, more surface acid sites and more surface adsorbed oxygen species and Mn4+ ion. These facts caused a better low-temperature activity for Mn/Co-Ce-ZrOX which was 99.0% at 180 degrees C. Furthermore, Mn/Co-Ce-ZrOX showed the best resistance to SO2 and H2O which mainly because the introduction of cobalt inhibited the formation of sulfate salts and hydroxyls on the surface of Mn/Co-Ce-ZrOX. (c) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.