US3898183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic oxidation compounds of combustible gaseous residues
Assignee: PRO CATALYST SOC
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Filing: 1973-10-30
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Granted: 1975-08-05
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Expires: 1993-10-30
Abstract
Abstract The invention relates to catalytic oxidation compounds of combustible gaseous residues. These compounds include physical mixtures of granular catalysts of which at least one is a catalyst based on metals from the platinum group on an alumina or aluminous support of large specific surface, and at least one other is a catalyst based on metal oxides on an alumina or aluminous support of a small specific surface. These compounds have the advantage of providing better oxidation yields and are particularly appropriate for the destruction of the hydrocarbons and carbon monoxide from the exhaust of internal combustion engines.
Inventors
- 👤 Andre Sugier
- 👤 Michel Prigent
- 👤 Georges Berrebi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:58
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J; B01J23/00; B01J23/38; B01J23/40; B01J35/00; B01J35/60; B01J35/61; B01J35/612; B01J35/613; B01J35/615; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
CATALYTIC OXIDATION COMPOUNDS FOR GASEOUS RESIDUES COMPRISING PHYSICAL MIXTURES OF AT LEAST TWO PARTICULATE CATALYSTS AT LEAST ONE OF WHICH IS FORMED OF AN ALUMINA OR ALUMINOUS SUPPORT HAVING A SPECIFIC SURFACE OF AT LEAST 40 M2/GRAM AND OF A CATALYTICALLY ACTIVE PORTION FORMED OF ONE OR MORE THE METALS OF THE PLATINUM GROUP AND AT LEAST ANOTHER OF WHICH IS FORMED OD AN ALUMINA OR ALUMINOUS SUPPORT HAVING A SPECIFIC SURFACE NO GREATER THAN 20 M2/GRAM AND A CATALYSTICALLY ACTIVE PORTION OF ONE OR MORE OXIDES OF A METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, CHROMIUM IRON MANGANESE COPPER, COBALT, NICKEL AND RARE EARTH METALS.
Claim 2
Dependent Claim
107 words
CATALYTIC OXIDATION COMPOUNDS FOR GASEOUS RESIDUES COMPRISING PHYSICAL MIXTURES OF AT LEAST TWO PARTICULATE CATALYSTS AT LEAST ONE OF WHICH IS FORMED OF AN ALUMINA OR ALUMINOUS SUPPORT HAVING A SPECIFIC SURFACE OF AT LEAST 40 M2/GRAM AND OF A CATALYTICALLY ACTIVE PORTION FORMED OF ONE OR MORE THE METALS OF THE PLATINUM GROUP AND AT LEAST ANOTHER OF WHICH IS FORMED OD AN ALUMINA OR ALUMINOUS SUPPORT HAVING A SPECIFIC SURFACE NO GREATER THAN 20 M2/GRAM AND A CATALYSTICALLY ACTIVE PORTION OF ONE OR MORE OXIDES OF A METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, CHROMIUM IRON MANGANESE COPPER, COBALT, NICKEL AND RARE EARTH METALS.
Claim 3
Dependent Claim
27 words
Catalytic compounds as claimed in claim 1 in which the metals of the platinum group are selected from the group consisting of platinum, iridium, palladium and ruthenium.
Claim 4
Dependent Claim
24 words
Catalytic compounds as claimed in claim 2 in which metal is present in an amount within the range of 0.01% to 0.12% by weight.
Claim 5
Dependent Claim
26 words
Catalytic compounds as claimed in claim 1 in which the metal oxides are present in an amount within the range of 5% to 30% by weight.
Claim 6
Dependent Claim
52 words
Catalytic compounds as claimed in claim 1 in which the catalyst based on a metal of the platinum group is on a support having a specific surface within the range of 40-120 m2/gram and in which the support for the metal oxide has a specific surface within the range of 2-20 m2/gram.
Claim 7
Dependent Claim
23 words
Catalytic compounds as claimed in claim 1 in which at least one of the granular catalysts is manufactured by impregnation of the supports.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |