NOx Trap definition

NOx Trap means an exhaust emission control device which traps (adsorbs or stores) NOx under lean combustion conditions. Periodically, by design, the trapped NOx is reduced to N2 by reaction with hydrocarbons under rich combustion conditions. This type of emission control device is sometimes referred to as a lean NOx trap, NOx adsorber, or NOx storage catalyst and is used on Generation 1 vehicles.