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International Journal of Automotive Technology > Volume 5(1); 2004 > Article
International Journal of Automotive Technology 2004;5(1): 1-7.
HCA AND TWC HYBRID SYSTEM FOR REDUCING COLD-START EMISSION
S. J. CHOUNG1, S. C. LEE1, J. H. JANG1, B. Y. LEE1, J. H. BAE2
1KyungHee University
2Heesung Engelhard
ABSTRACT
In line with the Super Ultra Low Emission Vehicle (SULEV) regulation, the main idea in this study has been focused on the utilization of hydrocarbon adsorber (HCA) to adsorb the excess hydrocarbons emitted during a period of engine cold-start. As main recipes of HCA materials, many types of zeolite as well as the combination of alumina and precious metals were used. Representative physico-chemical factors of zeolite such as acidic and hydrophobic properties were characterized. The optimum recipe of HCA materials was also determined. Among the acid properties of zeolites, the Si/Al ratio was found to be the most important factor to get higher hydrocarbon adsorption capacity.
Key Words: HCA, Zeolite, SULEV, Hybrid system
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