1995-02-01

Excellent Oxygen Storage Capacity of Perovskite-PD Three way Catalysts 950256

Increasingly stringent emissions controls have led to a greater emphasis on strategies designed to minimize emission during cold start. One strategy employed is that of close-coupling the catalyst to the exhaust manifold of the engine in an effort to minimize catalyst light-off time. In this configuration, the catalyst must exhibit a high degree of thermal stability.
Further, since the catalyst is situated nearer to the engine, it is more liable to sense cylinder-to-cylinder variations in exhaust gas composition and thus needs to possess a wider operating window than a catalyst positioned further underbody.
We have previously reported that Perovskite-Pd catalysts exhibit excellent heat resistance and have three-way catalyst activity comparable with or superior to that of Pt-Rh/ Al2O3 catalysts and Pd/Al2O3 catalysts [1]*.
Durability at high temperatures and oxygen storage capacity under large air/fuel (A/F) ratio fluctuation conditions have now been tested.
As a result, it has been found that the Perovskite-Pd catalysts exhibit satisfactory thermal resistance, good oxygen storage capacity and excellent performance.
The Perovskite-Pd catalyst may be applicable to both electronically fuel injected engines and carburetor specifications engines.

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