Bimetallic IrRh/CeO2–ZrO2 as a Highly Active Catalyst for NO–CO–C3H6–H2–O2 Reactions under Stoichiometric Conditions

The catalytic activity of Rh/CeO2–ZrO2 for NO–CO–C3H6–H2–O2 reactions under stoichiometric conditions was significantly improved by the addition of Ir. The optimum Ir/Rh atomic ratio was 1/9. The improvement was ascribed to the formation of finely divided Ir species on the surface of Rh particles. IrRh/CeO2–ZrO2 with an IrRh loading of 0.3 wt % showed high catalytic performance, which is comparable with that of 0.5 wt % Rh/CeO2–ZrO2, leading to minimize the Rh usage.