US4053434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas conversion catalyst
Assignee: Union Oil Company of California
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Filing: 1976-06-19
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Granted: 1977-10-11
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Expires: 1996-06-19
Abstract
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.
Inventors
- 👤 Dennis P. McArthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9459; B01D53/9404; B01D53/9409; B01D53/944; B01J; B01J23/00; B01J23/70; B01J23/89; B01J35/00; B01J35/19; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1023; B01D2255/1025; B01D2255/20; B01D2255/207; B01D2255/20746; B01D2255/20753; B01D2255/90; B01D2255/92; B01D2255/9202
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
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.
Claim 2
Dependent Claim
87 words
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.
Claim 3
Dependent Claim
32 words
A catalytic composite as defined in claim 1 wherein said components A and B are in the form of separately consolidated granules having an average diameter between about 1/32 and 1/4 inch.
Claim 4
Dependent Claim
16 words
A catalytic composite defined in claim 2 wherein said separately consolidated granules are substantially homogeneously admixed.
Claim 5
Dependent Claim
35 words
A catalytic composite as defined in claim 1 wherein said components A and B are in the form of mixed and consolidated powders, said powders having a particle size between about 10 and 1000 microns.
Claim 6
Dependent Claim
24 words
A catalytic composite as defined in claim 1 wherein at least one of said porous inert supports is composed of a crystalline aluminum borate.
Claim 7
Dependent Claim
22 words
A catalytic composite as defined in claim 1 wherein each of said porous inert supports is composed of a crystalline aluminum borate.
Claim 8
Dependent Claim
17 words
A catalytic composite as defined in claim 1 wherein said component B comprises both platinum and palladium.
Claim 9
Dependent Claim
20 words
A catalytic composite as defined in claim 1 wherein said component A comprises nickel and said component B comprises cobalt.
Claim 10
Dependent Claim
22 words
A catalytic composite as defined in claim 8 wherein each of said porous inert supports is composed of a crystalline aluminum borate.
Claim 11
Dependent Claim
23 words
A catalytic composite as defined in claim 1 wherein each of said components A and B comprises about 20-80 weight-percent of said composite.
Claim 12
Dependent Claim
29 words
A catalytic composite as defined in claim 10 wherein the weight-percent of rhodium therein is between about 1/10 and 1/100 the weight-percent of the total platinum and palladium therein.
Claim 13
Dependent Claim
96 words
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.
Claim 14
Dependent Claim
96 words
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.
Claim 15
Dependent Claim
43 words
A catalytic composite as defined in claim 12 which includes in addition a third separate but contiguous component, C, comprising an inert porous support having dispersed thereon a minor proportion of platinum and/or palladium, and being essentially free of nickel, cobalt and rhodium.
Claim 16
Dependent Claim
35 words
A catalytic composite as defined in claim 4 wherein said mixed consolidated powders are in the form of an adherent membrane applied to the surface of channels traversing a ceramic monolith having a honeycomb structure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |