Diesel Exhaust Particulate Control by Monolith Trap and Fuel Additive Regeneration

This paper summarizes development of a diesel exhaust-particulate control system using a ceramic wall flow monolith trap and an organometallic additive in the engine fuel. Regenerative features of the additive and limitations of the trap are identified. Included is a description of a supplemental ignition system. Limited trap-durability data are given and additive-deposit effects on the trap, engine and vehicle fuel system are described. Exhaust emissions of regulated constituents and additive effluent are also presented. A detailed study of additive-concentration and particulate-loading effects on trap regeneration and durability is described.

It is concluded that although trap durability has been improved with fuel-additive-assisted regeneration, much basic development remains to be accomplished for this system to be considered a candidate for production application.