Lean burn emissions system protectant composition and method
AssigneeEthyl Corporation
InventorsJoseph W. Roos, Martin J. Openshaw, Herbert M. Scull
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Abstract
A method, apparatus, and fuel composition for the protection of a catalytic after treatment system and a method for protecting a catalytic after treatment system in a lean burn system are disclosed. A scavenging agent is introduced into the combustion chamber in an amount effective to complex with catalytic poisoning combustion byproducts and improve emissions system durability. In a preferred embodiment, the scavenger is an organometallic compound which also imparts additional desirable properties to the fuel.
Claims22
A method of enhancing performance durability of a catalytically-based emissions control system in a lean fuel combustion system containing a catalytic device having a transition metal, alkali or alkaline earth metal element, or combinations thereof (catalytic elements), said combustion system producing combustion byproducts of sulfur and phosphorus, comprising:
- supplying a fuel to said lean fuel system,
- said combustion system being provided with a scavenger, said scavenger comprising an organometallic compound comprising at least one metal selected from the group consisting of magnesium, manganese, barium, cerium, strontium, iron, calcium, and mixtures thereof, said scavenger complexing with combustion byproducts of sulfur and phosphorus,
- said scavenger being supplied in an effective amount to complex with the fuel combustion byproducts,
- said scavenger being free of a platinum group metal selected from the group consisting of platinum, palladium, rhodium, ruthenium, osmium, and iridium,
- whereby the impact of said fuel combustion byproducts on the catalytic device of said emissions control system is reduced.
Dependencies are inferred from the claim text.