US4140749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating vehicle exhaust gas and catalyst used therein
Assignee: Robert Bosch GmbH
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Filing: 1977-06-08
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Granted: 1979-02-20
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Expires: 1997-06-08
Abstract
Abstract The present invention provides a catalyst for converting the noxous CO, NO x and hydrocarbons found in the exhaust gases from internal combustion engines into less harmful gases, and to the method of treating said exhaust gases. The catalyst consists essentially of a solid solution of Fe 2 O 3 , Cr 2 O 3 , and Fe 3 O 4 . The catalyst may be extended on a porous carrier such as aluminum oxide or aluminum silicate. The catalyst is particularly suited for treating the exhaust gas from internal combustion engines of motor vehicles.
Inventors
- 👤 Detlef Baresel
- 👤 Peter Scharner
- 👤 Gerhard Huth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:22
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/862; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
91 words
An internal combustion exhaust gas catalyst for simultaneously reducing the CO, NO x , and the hydrocarbon content of the exhaust gases from internal combustion engines, particularly motor vehicles, consisting essentially of a solid solution of Fe 2 O 3 and Cr 2 O 3 which also contains an amount of Fe 3 O 4 sufficient to reduce the hydrocarbon content of said exhaust gases, and between about 1 and 15 mol % of at least one oxide selected from the group consisting of barium oxide, potassium oxide, and lithium oxide.
Claim 2
Dependent Claim
91 words
An internal combustion exhaust gas catalyst for simultaneously reducing the CO, NO x , and the hydrocarbon content of the exhaust gases from internal combustion engines, particularly motor vehicles, consisting essentially of a solid solution of Fe 2 O 3 and Cr 2 O 3 which also contains an amount of Fe 3 O 4 sufficient to reduce the hydrocarbon content of said exhaust gases, and between about 1 and 15 mol % of at least one oxide selected from the group consisting of barium oxide, potassium oxide, and lithium oxide.
Claim 3
Dependent Claim
23 words
The catalyst of claim 1 wherein the ratio of Fe 2 O 3 :Cr 2 O 3 is between about 1.5:1 and 0.3:1.
Claim 4
Dependent Claim
25 words
The catalyst of claim 2 containing between about 20 and 50 mol % of Fe 3 O 4 based on the total iron oxide content.
Claim 5
Dependent Claim
11 words
The catalyst of claim 1 wherein said oxide is barium oxide.
Claim 6
Dependent Claim
11 words
The catalyst of claim 2 where said oxide is barium oxide.
Claim 7
Dependent Claim
18 words
The catalyst of claim 3 which also contains between about 1 and 15 mol % of barium oxide.
Claim 8
Dependent Claim
46 words
The catalyst of claim 3 which also contains between about 1 and 15% by volume of at least one powdered metal selected from the group consisting of iron and chromium based on the total amount of Fe 2 O 3 and Cr 2 O 3 .
Claim 9
Dependent Claim
46 words
The catalyst of claim 1 which also contains between about 1 and 15% by volume of at least one powdered metal selected from the group consisting of iron and chromium based on the total amount of Fe 2 O 3 and Cr 2 O 3 .
Claim 10
Dependent Claim
27 words
The catalyst of claim 1 extended on a porous substrate which is at least one material selected from the group consisting of aluminum oxide and aluminum silicate.
Claim 11
Dependent Claim
79 words
An internal combustion exhaust gas catalyst for simultaneously reducing the CO, NO x , and the hydrocarbon content of the exhaust gases from internal combustion engines, particularly motor vehicles, consisting essentially of a solid solution of Fe 2 O 3 and Cr 2 O 3 which also contains an amount of Fe 3 O 4 sufficient to reduce the hydrocarbon content of said exhaust gases, and at least one powder selected from the group consisting of iron and chromium.
Claim 12
Dependent Claim
79 words
An internal combustion exhaust gas catalyst for simultaneously reducing the CO, NO x , and the hydrocarbon content of the exhaust gases from internal combustion engines, particularly motor vehicles, consisting essentially of a solid solution of Fe 2 O 3 and Cr 2 O 3 which also contains an amount of Fe 3 O 4 sufficient to reduce the hydrocarbon content of said exhaust gases, and at least one powder selected from the group consisting of iron and chromium.
Claim 13
Dependent Claim
25 words
The catalyst of claim 10 containing between about 20 and 50 mol % of Fe 3 O 4 based on the total iron oxide content.
Claim 14
Dependent Claim
27 words
The catalyst of claim 10 extended on a porous substrate which is at least one material selected from the group consisting of aluminum oxide and aluminum silicate.
Claim 15
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 2.
Claim 16
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 3.
Claim 17
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 1.
Claim 18
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 10.
Claim 19
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 11.
Claim 20
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 4.
Claim 21
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 5.
Claim 22
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 6.
Claim 23
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 7.
Claim 24
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 8.
Claim 25
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hyrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 12.
Claim 26
Dependent Claim
34 words
A method for reducing the quantity of CO, NO x , and hydrocarbons found in exhaust gases from internal combustion engines comprising contacting the said exhaust gases with the catalyst claimed in claim 9.
References Cited (Backward Citations)
US2408140A
Cited
US3957691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |