Inventors:
Hungwen Jen - Troy MI, US
Gopichandra Surnilla - West Bloomfield MI, US
Christian Goralski, Jr. - Ypsilanti MI, US
Joseph Theis - Rockwood MI, US
Justin Ura - Livonia MI, US
Assignee:
Ford Global Technologies, LLC - Dearborn MI
International Classification:
B01J 23/00
B01J 21/00
B01J 20/00
US Classification:
502325, 502326, 502327, 502328, 502330, 502332, 502333, 502334, 502339, 502302, 502303, 502304, 50252712, 50252713
Abstract:
The present invention provides a catalyst for use in a NOtrap that has reduced NOrelease during rich purges, increased NO conversion efficiency under stoichiometric conditions, and improved sulfur tolerance. The catalyst of this embodiment includes a precious metal, an oxygen storage component in contact with the precious metal, and a NOstorage material. The oxygen storage component in contact with the precious metal is present in an amount that provides sufficient oxygen storage capacity to reduce the NOrelease from the NOtrap during rich purges to less than 20% of the NOthat is stored in the NOtrap across the operating temperature window of the NOtrap, increase the NOconversion efficiency under stoichiometric conditions to a value greater than 70%, and increase the sulfur tolerance of the NOtrap.