US4316822A
Expired / Lapsed
US
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Catalyst for purifying exhaust gases
Assignee: Toyota Central R&D Labs Inc
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Filing: 1980-12-08
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Granted: 1982-02-23
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Expires: 2000-12-08
Abstract
Abstract A catalyst for reducing nitrogen oxides, carbon monoxide and hydrocarbons, the noxious components in exhaust gases from internal combustion engines, etc., comprising: a porous carrier of ceramic selected from the group consisting of alumina and alumina-magnesia spinel; and a catalyst ingredient supported thereon consisting essentially of zirconium oxide, cerium oxide and a metal selected from the group consisting of platinum, palladium and mixtures thereof.
Inventors
- 👤 Yoshiyasu Fujitani
- 👤 Hideaki Muraki
- 👤 Shiroh Kondoh
- 👤 Makoto Tomita
- 👤 Kouji Yokota
- 👤 Hideo Sobukawa
- 👤 Tamotsu Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:40
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; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
49 words
A catalyst for reducing nitrogen oxides, carbon monoxide and hydrocarbons, the noxious components in exhaust gases comprising: a porous carrier of ceramic; and a catalyst ingredient supported thereon consisting essentially of zirconium oxide, cerium oxide and a metal selected from the group consisting of platinum, palladium and mixtures thereof.
Claim 2
Dependent Claim
49 words
A catalyst for reducing nitrogen oxides, carbon monoxide and hydrocarbons, the noxious components in exhaust gases comprising: a porous carrier of ceramic; and a catalyst ingredient supported thereon consisting essentially of zirconium oxide, cerium oxide and a metal selected from the group consisting of platinum, palladium and mixtures thereof.
Claim 3
Dependent Claim
21 words
The catalyst according to claim 1, wherein said ceramic is one selected from the group consisting of alumina and alumina-magnesia spinel.
Claim 4
Dependent Claim
20 words
The catalyst according to claim 2, wherein said alumina is one selected from the group consisting of α-alumina and δ-alumina.
Claim 5
Dependent Claim
28 words
The catalyst according to claim 1, wherein the amount of zirconium oxide supported on the carrier is from 0.6 g to 100 g per liter of the carrier.
Claim 6
Dependent Claim
28 words
The catalyst according to claim 1, wherein the amount of cerium oxide supported on the carrier is from 0.8 g to 170 g per liter of the carrier.
Claim 7
Dependent Claim
28 words
The catalyst according to claim 1, wherein the amount of said metal supported on the carrier is from 0.01 g to 50 g per liter of the carrier.
Claim 8
Dependent Claim
20 words
The catalyst according to claim 1, wherein said porous carrier has an average pore diameter of 0.01 to 2 microns.
Claim 9
Dependent Claim
24 words
The catalyst according to claim 1, wherein the shape of the catalyst is one selected from the group consisting of pellets, pillars and honeycombs.
Claim 10
Dependent Claim
26 words
The catalyst according to claim 1, wherein said porous carrier comprises a matrix of cordierite and a porous layer of ceramic formed on the surface thereof.
Claim 11
Dependent Claim
23 words
The catalyst according to claim 9, wherein the shape of said matrix is one selected from the group consisting of pellets and honeycombs.
Claim 12
Dependent Claim
22 words
The catalyst according to claim 9, wherein said ceramic is one selected from the group consisting of α-alumina, δ-alumina and alumina-magnesia spinel.
Claim 13
Dependent Claim
46 words
A method of producing the catalyst according to claim 1, which comprises: dipping a porous body in a solution of compounds of zirconium, cerium and a metal selected from the group consisting of platinum, palladium and mixtures thereof; drying the resulting porous body; and calcining it.
Claim 14
Dependent Claim
23 words
The method according to claim 12, wherein the zirconium compound is one selected from the group consisting of zirconium oxynitrate and zirconium oxychloride.
Claim 15
Dependent Claim
25 words
The method according to claim 12, wherein the cerium compound is one selected from the group consisting of cerium (III) nitrate and cerium (III) chloride.
Claim 16
Dependent Claim
23 words
The method according to claim 12, wherein the platinum compound is one selected from the group consisting of platinum nitrate and chloroplatinic acid.
Claim 17
Dependent Claim
23 words
The method according to claim 12, wherein the palladium compound is one selected from the group consisting of palladium nitrate and palladium chloride.
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) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |