Patent ID: 6192679
Filing Date: 2001-02-27
Classification: B01D,F01N,Y02A,Y02T

Abstract:
An exhaust purifying device, for purifying hydrocarbons in an exhaust of an internal combustion engine, the exhaust purifying device comprising:first converter comprising a hydrocarbon adsorbent and a catalyst, a second converter comprising a hydrocarbon adsorbent and a catalyst said adsorbents adsorbing hydrocarbons at a temperature lower than a first temperature and discharging adsorbed hydrocarbons at a temperature higher than said first temperature, said catalysts oxidizing hydrocarbons discharged from said adsorbents at a temperature higher than a second temperature which is higher than said first temperature, andan exhaust passage connecting said first and second converters such that said first converter is situated further upstream than said second converter with respect to the flow of exhaust, said exhaust passage having a heat capacity that prevents said adsorbent of said second converter from reaching said first temperature before the temperature of said catalyst of said first converter rises to said second temperature.