Synergistic effect in ternary CeO2-ZrO2-MnOx catalysts for CO oxidation and soot combustion

Abstract

The development of new environmental catalysts is related to the selection of effective available catalyst components that can potentially show synergistic effects in target catalytic applications. Here, a series of ternary CeO2-ZrO2-MnOx materials is systematically studied to reveal the synergy of noble-metal-less oxide systems in CO oxidation and soot combustion. The ternary structure-performance diagrams are generated for both reactions to show new insights into the composition-dependent behavior. In CO oxidation, the Ce0.5Mn0.3Zr0.2O2 sample shows high activity caused by increased concentration of highly dispersed easily reducible MnOx species, while the Ce0.5Mn0.2Zr0.3O2 sample is active in soot oxidation due to the formation of a large number of interface boundaries between highly dispersed MnOx species and Ce1-xZrxO2 solid solution. This work introduces a strategy for designing new highly effective environmental catalysts.