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Three-way catalysts, a component of automobile converters, can control auto exhaust emissions by its capacity of converting CO, un-burnt hydrocarbon and oxides of nitrogen (NO x ) into less harmful CO2, H2O and N2 simultaneously. This process is efficient only when the A/F ratio is at 14.7. To widen the ratio for better chemical control, oxygen storage catalysts (OSC) based on CeO2, capable of three-way action, are employed in converters along with conventional catalysts. In this article, the enhanced activity of noble metal ion incorporated/dispersed CeO2 catalysts towards three-way action over conventional metal particles dispersed (in a matrix) catalysts is illustrated. The better performance of the metal ion dispersed catalysts is attributed to better dispersion of active metal ion sites over the reducible matrix like CeO2, leading to many-fold increase in the number of active sites.

Noble metal ion-substituted ceria as efficient oxygen storage catalysts for clean combustion of fuels