Abstract
Addition of La, Ba and Ce to Pd 3-way exhaust catalysts has been studied. The effect of these additives and temperature of calcination were studied on the activity of the catalysts stabilized in a simulated exhaust gas at 570°C (1 h), using an experimental design. The catalytic activities were measured in the simulated exhaust gas as a function of temperature. Also, the activity of the catalysts for the NO - CO - O2 system, was measured while changing the oxygen content. The results show that La promotes the reduction of NO at temperatures below 250°C. Improved catalysts have a high thermal stability.
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