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Proper selection of a noninteracting catalyst carrier is important to prevent thermal degradation. The N1AI2O4 coating appears to impart catalytic stability to the Pd-Ni catalyst system compared to AI2O3-SÍO2.4. The optimum reaction conditions for NO reduction over Pd-Ni and Pd-Ru occur at air-to-fuel ratios just slightly rich of stoichiometry, an operating region also characterized by maximum power output and nearly minimum fuel consumption in the IC engine.