A CeO 2 -grafted MnFeO y (CeO 2 /MnFeO y ) has been developed as a substitute for the oxygen-storage CeO 2 material in three-way catalysts. In the CeO 2 / MnFeO y composite, CeO 2 grains were intimately bound to the surface of the MnFeO y solid solution, which adopted an α-Mn 2 O 3 -type structure. Because the surface-grafted CeO 2 acts as an oxygen gateway and MnFeO y acts as an oxygen reservoir, the combination of these oxides has a synergistic effect leading to the fast release and storage of a larger amount of oxygen compared with the separate constituents. The catalytic and oxygen release and storage performances of CeO 2 /MnFeO y were superior to those of CeO 2 /Fe 2 O 3 in a previous study and were correlated to the contribution of Mn in the redox cycles. Finally, a real-sized honeycomb catalyst containing CeO 2 /MnFeO y was developed and tested using a vehicle driven on a chassis dynamometer in the JC08 (hot start) mode for gasoline engine vehicles (Japanese-type approval test cycle) and compared with a reference honeycomb catalyst containing CeO 2 . Despite a 30% decrease in the amount of CeO 2 , the developed honeycomb catalyst demonstrated high conversions of NO x , CO, and total hydrocarbons that were comparable with those of the reference honeycomb catalyst.
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