US4738947A
Expired / Lapsed
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Three-way catalysts of improved efficiency
Assignee: BASF Catalysts LLC
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Filing: 1985-09-04
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Granted: 1988-04-19
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Expires: 2005-09-04
Abstract
Abstract A three-way catalyst of improved efficiency suitable for simultaneously oxidizing both gaseous hydrocarbons and carbon monoxide, while reducing nitrogen oxides is disclosed. The three-way catalyst includes alumina, a platinum group metal and a rare earth metal oxide having deposited thereon in intimate contact therewith a p-type metal oxide.
Inventors
- 👤 Chung-Zong Wan
- 👤 Joseph C. Dettling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J23/64; B01J23/652; B01J23/6522; B01J23/656; B01J23/6562; B01J23/70; B01J23/89; B01J23/8933; B01J23/894; B01J37/00; B01J37/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
53 words
An improved catalyst active at least for oxidation of hydrocarbons and carbon monoxide in a gas stream, said catalyst being of the type having, dispersed on a refractory support, platinum, particles of ceria and high surface area alumina, wherein the improvement comprises: a p-type metal oxide being dispersed on said particles of ceria.
Claim 2
Dependent Claim
53 words
An improved catalyst active at least for oxidation of hydrocarbons and carbon monoxide in a gas stream, said catalyst being of the type having, dispersed on a refractory support, platinum, particles of ceria and high surface area alumina, wherein the improvement comprises: a p-type metal oxide being dispersed on said particles of ceria.
Claim 3
Dependent Claim
28 words
The catalyst of claim 1 wherein the amount of cerium oxide ranges from about 5 to about 30 percent by weight of the catalyst, exclusive of substrate material.
Claim 4
Dependent Claim
27 words
The catalyst of claim 1 wherein the p-type metal oxide ranges from about 0.1 to about 10 percent by combined weight of the cerium oxide/p-type metal oxide.
Claim 5
Dependent Claim
18 words
The catalyst of claim 1 wherein platinum is dispersed on the p-type metal oxide bearing cerium oxide particles.
Claim 6
Dependent Claim
18 words
The catalyst of claim 1 wherein the p-type metal oxide coated ceria particles are dispersed on alumina particles.
Claim 7
Dependent Claim
16 words
The catalyst of claim 1 wherein the cerium oxide is present with other rare earth oxides.
Claim 8
Dependent Claim
12 words
The catalyst of claim 1 wherein the cerium oxide is colloidal ceria.
Claim 9
Dependent Claim
14 words
The catalyst of claim 1 wherein the p-type metal oxide is nickel oxide (NiO).
Claim 10
Dependent Claim
27 words
The catalyst of claim 1 wherein the p-type metal oxide is a cobalt chosen from the grup consisting of CoO, Co 3 O 4 and mixtures thereof.
Claim 11
Dependent Claim
28 words
The catalyst of claim 1 wherein the p-type metal oxide is an iron oxide chosen from the group consisting of FeO, Fe 3 O 4 and mixtures thereof.
Claim 12
Dependent Claim
28 words
The catalyst of claim 1 wherein the p-type metal oxide is a manganese oxide chosen from the group consisting of MnO, Mn 2 O 3 and mixtures thereof.
Claim 13
Dependent Claim
28 words
The catalyst of claim 1 wherein the p-type metal oxide is a chromium oxide chosen from the group consisting of CrO, Cr 2 O 3 and mixtures thereof.
Claim 14
Dependent Claim
18 words
The catalyst of claim 8 wherein the platinum bearing particles defined are dispersed on particles of gamma alumina.
Claim 15
Dependent Claim
18 words
The catalyst of claim 1 wherein the catalyst further comprises palladium dispersed on said high surface area alumina.
Claim 16
Dependent Claim
20 words
The catalyst of claim 1 wherein the platinum is incorporated therein at a concentration of about 5 g/ft 3 .
Claim 17
Dependent Claim
19 words
the catalyst of claim 1 further comprising particles of substantially rare earth oxide free alumina having rhodium dispersed thereon.
Claim 18
Dependent Claim
46 words
The catalyst active at least for reduction of oxides of nitrogen in a gas stream, said catalyst being of the type having ceria particles and platinum dispersed on a refractory oxide support, wherein the improvement comprises: a p-type metal oxide being dispersed on said ceria particles.
Claim 19
Dependent Claim
46 words
The catalyst active at least for reduction of oxides of nitrogen in a gas stream, said catalyst being of the type having ceria particles and platinum dispersed on a refractory oxide support, wherein the improvement comprises: a p-type metal oxide being dispersed on said ceria particles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |