Regenerating sulphur poisoned diesel catalysts

Details Regenerating sulphur poisoned diesel catalysts Regenerating sulphur poisoned diesel catalysts

2005-12-27

2005-12-27

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S285000, C060S286000, C060S297000, C060S311000

Reexamination Certificate

active

06978601

ABSTRACT:
A diesel (compression ignition) engine having combustion management means and an exhaust gas aftertreatment system without an NOxtrap, which system includes a platinum group metal (PGM) catalyst liable to be poisoned by fuel sulphur to cause significant degradation of catalyst performance, which engine is fuelled, at least intermittently, by a diesel fuel containing such levels of sulphur as to cause poisoning of the catalyst, wherein the combustion management means is effective to modulate the air/fuel ratio (λ) to 0.95, preferably 0.90, or richer for a time which is in aggregate sufficient to cause release of significant quantities of sulphur-containing species from the catalyst or catalyst components, whereby the catalyst is regenerated.

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