Hydrogen sulfide-suppressing catalyst compositions
AssigneeEngelhard Corporation
InventorsJohn S. Foong, Harold N. Rabinowitz
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Abstract
Hydrogen sulfide formation is suppressed by a three-way conversion catalyst having an underlayer and a topcoat overlying the under layer. The under layer is prepared by dispersing a Group IIa metal oxide such as an oxide of magnesium, calcium, barium or strontium on a carrier such as a refractory metal oxide monolith. A topcoat overlying the undercoat is comprised of a three-way conversion catalyst material such as a platinum-group metal catalytic component, e.g., platinum, palladium, rhodium or mixtures thereof.
Claims17
A hydrogen sulfide suppressing catalyst comprising a Group IIa metal oxide and a lanthanum oxide undercoat disposed on a carrier, and a topcoat discrete layer segregated from, and disposed on, the undercoat comprising a three-way conversion catalyst material overlying the undercoat.
Dependencies are inferred from the claim text.