Two perovskite-related catalysts doped with small amounts of noble metals, LaMn_(0.976)Rh_(0024)O_(3+delta) and La_2Cu_(0.9)Pd_(0.1)O_(4+delta), present high activity for three-way catalysis reactions including the simultaneous removal of CO, NO and C_3H_6. These catalysts exhibit oxygen storage properties, evidenced in step-change experiments where CO was oxidised by the lattice oxygen of the solids, at low temperature (400 deg C). These properties allow them to compensate for the fluctuation of the feedstream stoichiometry, when the activity is evaluated under cycling conditions.
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