Exhaust gas conversion catalyst
AssigneeUnion Oil Company of California
InventorDennis P. McArthur
Life of this patent
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Abstract
A porous catalytic composite is provided which is effective for the simultaneous conversion of nitrogen oxides, carbon monoxide and hydrocarbons in engine exhaust gases. The composite comprises at least two physically separate but contiguous components. The first component comprises a porous inert support having dispersed thereon rhodium plus nickel and/or cobalt, and is essentially free of platinum and palladium. The second component comprises a porous inert support having dispersed thereon platinum and/or palladium, with or without nickel and/or cobalt, and is essentially free of rhodium.
Claims14
A porous, catalytic composite effective for the simultaneous conversion of nitrogen oxides, carbon monoxide and hydrocarbons in engine exhaust gases, said composite comprising a mixture of two separate components, A and B, component A comprising a porous, inert support having dispersed thereon a minor proportion of nickel and/or cobalt and a still smaller proportion of rhodium, and being essentially free of platinum and palladium, component B comprising a porous inert support having dispersed thereon a minor proportion of platinum and/or palladium and being essentially free of rhodium.
A porous, catalytic composite effective for the simultaneous conversion of nitrogen oxides, carbon monoxide and hydrocarbons in engine exhaust gases, said composite comprising a mixture of two separate components, A and B, component A comprising a porous, inert support having dispersed thereon a minor proportion of nickel and/or cobalt and a still smaller proportion of rhodium, and being essentially free of platinum and palladium, component B comprising a porous inert support having dispersed thereon a minor proportion of nickel and/or cobalt and a still smaller proportion of platinum and/or palladium and being essentially free of rhodium.
Dependencies are inferred from the claim text.