Patent ID: 6296813
Filing Date: 2001-10-02
Classification: F01N,Y02T

Abstract:
An exhaust emission control catalyst apparatus for an internal combustion engine, comprising:a honeycomb carrier having a plurality of cells through which exhaust, discharged from the internal combustion engine, flows;a hydrocarbon adsorption material layer that is coated on the surface of each cell except a downstream end portion of the surface of each cell, the hydrocarbon adsorption material layer adsorbing hydrocarbon at a lower temperature and emitting hydrocarbon at a high temperature;a first three way catalytic layer which converts hydrocarbon and which is coated on said hydrocarbon adsorption material layer and said downstream end portion of the surface of each cell; anda second three way catalytic layer that is coated on a portion of the first three way catalytic converter layer coated on said downstream end portion of the surface of each cell, the second three way catalytic layer converting hydrocarbon with higher efficiency than the first three way catalytic converter layer.