US4299734A
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Catalyst for purifying exhaust gases and method for producing same
Assignee: Toyota Central R&D Labs Inc
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Filing: 1980-05-20
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Granted: 1981-11-10
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Expires: 2000-05-20
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 consisting essentially of zirconia and at least one oxide selected from the group consisting of cerium oxide, manganese oxide and iron oxide; and a metal as a catalyst ingredient supported thereon selected from the group consisting of platinum, palladium and mixtures thereof. A method for producing the aforesaid catalyst.
Inventors
- 👤 Yoshiyasu Fujitani
- 👤 Hideaki Muraki
- 👤 Shiroh Kondoh
- 👤 Makoto Tomita
- 👤 Kouji Yokota
- 👤 Hideo Sobukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
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; B01J23/656; B01J23/6562; B01J23/70; B01J23/89; B01J23/8906; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
62 words
A catalyst for reducing nitrogen oxides, carbon monoxide and hydrocarbons, the noxious components in exhaust gases comprising: a porous carrier consisting essentially of zirconia and at least one oxide selected from the group consisting of cerium oxide, manganese oxide and iron oxide; and a metal as a catalyst ingredient supported thereon selected from the group consisting of platinum, palladium and mixtures thereof.
Claim 2
Dependent Claim
62 words
A catalyst for reducing nitrogen oxides, carbon monoxide and hydrocarbons, the noxious components in exhaust gases comprising: a porous carrier consisting essentially of zirconia and at least one oxide selected from the group consisting of cerium oxide, manganese oxide and iron oxide; and a metal as a catalyst ingredient supported thereon selected from the group consisting of platinum, palladium and mixtures thereof.
Claim 3
Dependent Claim
38 words
The catalyst according to claim 1, wherein the porous carrier contains from 1 g to 80 g of at least one oxide selected from the group consisting of cerium oxide, manganese oxide and iron oxide per liter thereof.
Claim 4
Dependent Claim
51 words
The catalyst according to claim 1, wherein said porous carrier is prepared by impregnating a porous sintered body of zirconia with an aqueous solution of at least one salt of iron, manganese and/or cerium; drying the resulting impregnated oxide; and heating the oxide to convert the metal salt(s) into the oxide(s).
Claim 5
Dependent Claim
48 words
The catalyst according to claim 1, wherein said porous carrier is prepared by mixing zirconia powder with at least one powdered metal oxide selected from the group consisting of cerium oxide, manganese oxide and iron oxide; molding the resulting metal oxide mixture and sintering the molded oxide object.
Claim 6
Dependent Claim
27 words
The catalyst according to claim 1, wherein the porous carrier contains 1 to 5 percent by weight of alumina as a binder for a porous sintered body.
Claim 7
Dependent Claim
29 words
The catalyst according to claim 1, wherein the content of the metal as a catalyst ingredient is from 0.1 g to 30 g per liter of the porous carrier.
Claim 8
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 9
Dependent Claim
91 words
A method for producing the catalyst according to claim 1, which comprises: molding a zirconia powder into the desired shape; sintering the resulting shaped material by heating to form a porous sintered body of zirconia; and thereafter incorporating at least one oxide selected from the group consisting of cerium oxide, manganese oxide and iron oxide into said porous sintered body of zirconia to form a catalyst carrier; and supporting the metal as a catalyst ingredient selected from the group consisting of platinum, palladium and mixtures thereof on said porous sintered body.
Claim 10
Dependent Claim
66 words
The method according to claim 8, wherein the step of incorporating said at least one oxide into the porous sintered body of zirconia comprises: impregnating said porous sintered body with an aqueous solution of nitrate selected from the group consisting of cerium nitrate manganese nitrate and iron nitrate, drying the impregnated porous sintered body and heating it so as to convert said nitrate into said oxide.
Claim 11
Dependent Claim
54 words
The method according to claim 8, wherein the step of supporting said metal on the porous sintered body comprises impregnating said porous sintered body with a solution of a material selected from the group consisting of platinum nitrate, chloroplatinic acid, palladium nitrate and palladium chloride, drying the resulting porous sintered body and calcining it.
Claim 12
Dependent Claim
25 words
The method according to claim 8, wherein said zirconia powder is molded into the shape selected from the group consisting of pellets, pillars and honeycombs.
Claim 13
Dependent Claim
82 words
The method for producing the catalyst according to claim 1, which comprises: mixing zirconia powder with at least one metal oxide powder selected from the group consisting of cerium oxide, manganese oxide and iron oxide; molding the mixed powder into the desired shape; sintering the resulting shaped material by heating the shaped material, thereby forming the catalyst carrier; and supporting the metal as a catalyst ingredient selected from the group consisting of platinum, palladium and mixtures thereof on said porous sintered body.
Claim 14
Dependent Claim
54 words
The method according to claim 12, wherein the step of supporting said metal on the porous sintered body comprises impregnating said porous sintered body with a solution of a material selected from the group consisting of platinum nitrate, chloroplatinic acid, palladium nitrate and palladium chloride, drying the resulting porous sintered body and calcining it.
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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |