US3915896A
Expired / Lapsed
US
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Catalytic process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-08-09
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Granted: 1975-10-28
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Expires: 1993-08-09
Abstract
Abstract A catalyst for exhaust gas treatment under oxidative or reductive conditions is supported on a refractory compound such as gehlenite in which a basic oxide is in combination with an acidic or amphoteric oxide. The active constituent of the catalyst is one or more platinum group metals.
Inventors
- 👤 Roger Geoffrey Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J23/00; B01J23/02; B01D2255/00; B01D2255/10; B01D2255/102; B01J2235/00; B01J2235/15
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
75 words
A SUPPORT FOR A CATALYST FOR TREATING INTERNAL COMBUSTION ENGINE EXHAUST GASES WHICH COMPRISES A PRIMARY CATALYST SUPPORT CARRYING A REFRACTORY SECONDARY CATALYST SUPPORT, THE SECONDARY SUPPORT CONSISTING ESSENTIALLY OF ONE OR MORE INVOLATILE ACIDIC AND/OR AMPHOTERIC OXIDES SELECTED FROM THE GROUP CONSISTING OF ALUMINA, SILICA, CHROMA, MANGANESE OXIDE IRON OXIDE AND MIXTURES OR COMPOUNDS THEREOF SUBSTANTIALLY IN COMBINATION WITH ONE OR MORE BASIC OXIDES SELECTED FROM THE GROUP CONSISTING OF CALCIUM, STRONTIUM AND BARIUM.
Claim 2
Dependent Claim
75 words
A SUPPORT FOR A CATALYST FOR TREATING INTERNAL COMBUSTION ENGINE EXHAUST GASES WHICH COMPRISES A PRIMARY CATALYST SUPPORT CARRYING A REFRACTORY SECONDARY CATALYST SUPPORT, THE SECONDARY SUPPORT CONSISTING ESSENTIALLY OF ONE OR MORE INVOLATILE ACIDIC AND/OR AMPHOTERIC OXIDES SELECTED FROM THE GROUP CONSISTING OF ALUMINA, SILICA, CHROMA, MANGANESE OXIDE IRON OXIDE AND MIXTURES OR COMPOUNDS THEREOF SUBSTANTIALLY IN COMBINATION WITH ONE OR MORE BASIC OXIDES SELECTED FROM THE GROUP CONSISTING OF CALCIUM, STRONTIUM AND BARIUM.
Claim 3
Dependent Claim
14 words
A support according to claim 1 in which the acidic oxide is an aluminosilicate.
Claim 4
Dependent Claim
18 words
A support according to claim 1 in which the secondary support comprises gehlenite or a compound isomorphous therewith.
Claim 5
Dependent Claim
31 words
A support according to claim 1 in which the secondary support is a naturally-occurring oxide, a man-made oxide or an oxide which is the in situ reaction product of precursors thereof.
Claim 6
Dependent Claim
32 words
A support according to claim 4 in which the secondary support is in the in situ reaction product of said basic oxide with said acidic and/or amphoteric oxides in the primary support.
Claim 7
Dependent Claim
50 words
A support according to claim 1 in which the primary support and the secondary support consist essentially of calcium aluminosilicate and the function of the primary support is performed by the inner regions of the support and the function of the secondary support is performed by the surface regions thereof.
Claim 8
Dependent Claim
13 words
A support according to claim 1 in which the primary support is cordierite.
Claim 9
Dependent Claim
13 words
A support according to claim 1 in the shape of a multi-tubular matrix.
Claim 10
Dependent Claim
62 words
A catalyst support comprising a cordierite primary support in the form of a multi-tubular matrix having 40 to 500 passages per square inch separated by walls of thickness 0.1 to 0.4 mm, and a secondary support forming a layer on the surface of the primary support, the secondary support constituting 2-40% by weight of the primary support and consisting essentially of gehlenite.
Claim 11
Dependent Claim
62 words
A catalyst support comprising a cordierite primary support in the form of a multi-tubular matrix having 40 to 500 passages per square inch separated by walls of thickness 0.1 to 0.4 mm, and a secondary support forming a layer on the surface of the primary support, the secondary support constituting 2-40% by weight of the primary support and consisting essentially of gehlenite.
Claim 12
Dependent Claim
32 words
A catalyst for the treatment of internal combustion engine exhaust gases on a support according to claim 1 and in which the catalytically active material is selected from the platinum group metals.
Claim 13
Dependent Claim
27 words
A catalyst according to claim 10 in which concentration of platinum group metal is in the range 0.005 to 0.5% by weight, calculated as equiatomic palladium metal.
Claim 14
Dependent Claim
23 words
A catalyst according to claim 10 in which the active metal is platinum or palladium, the catalyst being intended for exhaust gas oxidation.
Claim 15
Dependent Claim
28 words
A catalyst according to claim 10 in which the active metal is a combination of platinum and rhodium, the catalyst being intended for reductive treatment of exhaust gas.
References Cited (Backward Citations)
US3535228A
Cited
US3637484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |