Patent Number: 6,617,276

Title: Hydrocarbon trap/catalyst for reducing cold-start emissions from internal combustion engines

Abstract: An active metal, particularly cesium, impregnated hydrocarbon adsorbent, such as zeolite, comprises an improved hydrocarbon trap/oxidizing catalyst for use in effectively adsorbing hydrocarbons during automotive cold-start and subsequently desorbing, oxidizing and removing hydrocarbons during warmer operating conditions. The active metal modified hydrocarbon adsorbent may be combined in other forms of multi-layer automotive exhaust gas catalytic structures.

Inventors: Ballinger; Todd Howard (Audubon, PA), Andersen; Paul Joseph (Plymouth Meeting, PA)

Assignee: Johnson Matthey Public Limited Company

International Classification: B01D 53/94 (20060101); B01J 029/06 (); B01J 029/068 ()

Expiration Date: 09/09/2020