OXYGEN STORAGE CAPACITY AND THERMAL STABILITY OF SYNERGIZED PGM CATALYST SYSTEMS

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Synergized PGM (SPGM) catalyst systems including ZPGM material compositions and formulations are disclosed. Variations of catalyst systems are tested to determine the synergistic effect of adding ZPGM material to PGM catalysts. The synergistic effect is determined under isothermal oscillating condition from which enhanced OSC property indicates enhanced catalytic behavior of disclosed SPGM catalyst systems as compared with commercial PGM catalysts with OSM for TWC applications. Disclosed SPGM catalyst systems is free of rare earth metals and especially Ce and may have an optimal OSC property and optimal thermal stability that increases with the temperature, showing acceptable level of O2 storage even at low temperatures.