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Received April 30, 2001
Accepted July 5, 2001
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Adsorption Characteristics of HCA(Hydrocarbon Adsorber) Catalysts for Hydrocarbon and NOx Removals under Cold-Start Engine Conditions
School of Environmental and Applied Chemistry, KyungHee University, Suwon 449-701, Korea 1LG Institute of Environment, Safety&Health, Seoul 120-140, Korea
sjchoung@khu.ac.kr
Korean Journal of Chemical Engineering, September 2001, 18(5), 698-703(6), 10.1007/BF02706389
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Abstract
To meet the SULEV (Super Ultra Low Emission Vehicle) regulations, we have focused on the utilization of HCA (Hydrocarbon Adsorber) in order to adsorb the excess hydrocarbons emitted during a period of engine coldstart. As main recipes of HCA materials, many types of zeolite as well as a combination of alumina and precious metals were used. Representative physico-chemical factors of zeolite such as acidic and hydrophobic properties have been characterized and tried to find the optimum recipe of HCA materials. Among the acid properties of zeolites, the Si/Al ratio has been found to be the most important factor to achieve higher hydrocarbon adsorption capacity.
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Hong SB, Seo G, Uh YS, Korean J. Chem. Eng., 15(5), 566 (1998)
Ichikawa S, Takemoto T, Sumida H, Koda Y, "Development of Low Light-off Three Way Catalyst," SAE 1999-01-0307, (1999)
Long YC, Jiang HW, Zeng H, Langmuir, 13(15), 4094 (1997)
Naomi N, Akira T, Hiroshige M, "In-line Hydrocarbon (HC) Adsorber System for Cold Start Emissions," SAE 970266, 31 (1997)
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Yoon KJ, Kang HK, Yie JE, Korean J. Chem. Eng., 14(5), 399 (1997)
