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Excellent Oxygen Storage Capacity of Perovskite-PD Three way Catalysts
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Abstract
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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Citation
Tanaka, H., Fujikawa, H., and Takahashi, I., "Excellent Oxygen Storage Capacity of Perovskite-PD Three way Catalysts," SAE Technical Paper 950256, 1995, https://doi.org/10.4271/950256.Also In
References
- “Perovskite-Pd Three-Way Catalysts for Automotive Applications” Tanaka H. Fujikawa H. Takahashi I. SAE Paper 930251 1993
- “Recent Developments in Electrically Heated Metal Monoliths” Whittenberger W.A. Kubsh J.E. SAE Paper 900503 1993
- “Use of Light-Off Catalysts to Meet the California LEV/ULEV Standards” Summers J.C. Skowron J.F. Miller M.J. SAE Paper 930386 1993
- “Development of Thermal Resistant Catalysts” Matsumoto S. Miyoshi N. Kimura M. Ozawa M. Toyota Technical Review 38 2 169 178 1988
- “Crystallographic, Electric and Thermochemical Properties of the Perovskite-Type L n1 -xSrxCoO 3 (Ln: Lanthanoid Element)” Ohbayashi H. Kudo T. Gejo T. Jpn. Jour. Appl. Phys. 13 1 1 7 1974
- “Perovskite-Pd Three-Way Catalysts for Automotive Applications” Tanaka H. Takahashi I. Jour. SAE Jpn 47 10 51 55 1993
- “Durability of Pd-Perovskite Automotive Three-Way Catalysts” Tanaka H. Takahashi I. Kimura M. Sobukawa H. TOCAT2 l 43 1994 Now Printing