A study of HC reduction with hydrocarbon adsorber systems

Hydrocarbon adsorber is considered as a promising technology to reduce cold start HCs in automotive exhaust gas. In this study, three in-line adsorber systems were tried to reduce the cold start emission. To check the basic c haracteristics of adsorber converters, surface areas, TPD and TPA were exam ined after a hydrothermal aging. Also idle engine bench was used to find th e adsorption and desorption capabilities of the adsorber systems at cold st art. Finally a practicability of the adsorber systems for the LEV achieveme nt was checked with FTP test on a 2.0 D M/T vehicle. The results of this st udy indicate that hydrocarbon adsorber system is one of the promising passi ve technologies to meet the ULEV regulation.