The Hybrid Catalyst, a New Catalyst Concept to Improve Utilization of Exhaust Gas Energy and Increase the Efficiency of Diesel Catalyst Systems

Authors

Dipl.-Ing. S. Hosogai, Honda R&D Co.Ltd, Saitama; Dipl.-Ing. K. Komatsu, Dipl.-Ing. Y. Unno, Emitec, Tokyo

Year

2003

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 539

Summary

In order to comply with future worldwide legislation on emission limits for diesel vehicles the efficiency of the catalyst must be improved for all emission components. Apart from improving engine and engine management systems, the oxidation catalyst must also be adapted to the specific requirements of modern diesel engines. The efficiency of oxidation catalysts depends mainly on the temperature of the catalyst and hence the temperature of the exhaust gases. In the case of highly efficient modern diesel engines, the temperature of the exhaust gases is within the range of the light-off temperature, especially when driving in urban areas. An improvement in efficiency therefore requires better utilization of the exhaust gas energy as well as locating the catalyst closely to the engine. By combining fast light-off with a heat storage function in one compact component, the hybrid catalyst provides optimum thermal management.

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