Patent ID: 6274107
Filing Date: 2001-08-14
Classification: B01D,B01J,F01N,F02B,Y02A

Abstract:
A method for treating a diesel engine exhaust stream comprising hydrocarbons selected from the group consisting of gaseous hydrocarbons and hydrocarbons present in a volatile organic fraction comprising the steps of:contacting the stream with a catalyst composition comprising ceria having a BET surface area of at least about 10 m.sup.2 /g, iron-doped Beta zeolite, and at least one catalytic metal selected from the group consisting of platinum and palladium;adsorbing at least some of the hydrocarbons on the catalyst;increasing the temperature of the exhaust gas and desorbing the hydrocarbons from the catalyst; andcatalyzing the oxidation of at least some of the hydrocarbons.