US3939104A
Expired / Lapsed
US
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Catalytic process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-10-02
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Granted: 1976-02-17
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Expires: 1993-10-02
Abstract
Abstract In a supported catalyst for treating internal combustion engine exhaust gases the active material comprises a non-noble metal or compound thereof and the support comprises a primary support carrying a secondary support; the secondary support consists essentially of one or more involatile acidic and/or amphoteric oxides substantially in combination with one or more basic oxides from Group II, III or IV of the Periodic Table. A platinum group metal may also be present. The catalyst can be used for reductive or oxidative treatment or for simultaneous reduction of nitrogen oxides and oxidation of carbon monoxide and hydrocarbons and exhibits high activity and long life.
Inventors
- 👤 John Stewart Campbell
- 👤 Keith Farmery
- 👤 David John Heath
- 👤 Norman Henry Harbord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:56
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/00; B01J23/02; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/20; B01D2255/207; B01D2255/20753; B01D2255/20761; B01D2255/20784; B01J2235/00; B01J2235/15; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
127 words
A catalyst for treating internal combustion engine exhaust gases which comprises at least one non-noble metal or compound thereof on a support that 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, chromia, manganese oxide, iron oxide and mixtures or compounds thereof substantially in combination with one or more basic oxides from the group consisting of calcium, strontium and barium wherein at least 70% by weight of said acidic and/or amphoteric oxide is in combination with said basic oxides and said one or more basic oxides is present in a quantity that will give a stoichiometric compound with said acidic and/or amphoteric compound.
Claim 2
Dependent Claim
127 words
A catalyst for treating internal combustion engine exhaust gases which comprises at least one non-noble metal or compound thereof on a support that 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, chromia, manganese oxide, iron oxide and mixtures or compounds thereof substantially in combination with one or more basic oxides from the group consisting of calcium, strontium and barium wherein at least 70% by weight of said acidic and/or amphoteric oxide is in combination with said basic oxides and said one or more basic oxides is present in a quantity that will give a stoichiometric compound with said acidic and/or amphoteric compound.
Claim 3
Dependent Claim
14 words
A catalyst according to claim 1 in which the acidic oxide is an aluminosilicate.
Claim 4
Dependent Claim
13 words
A catalyst according to claim 2 in which the secondary support comprises melilite.
Claim 5
Dependent Claim
22 words
A catalyst according to claim 1 in which the secondary support has a porosity in the range 30 to 70% by volume.
Claim 6
Dependent Claim
27 words
A catalyst according to claim 1 in which the secondary support is naturally-occurring or separately made material or is the in situ reaction product of precursors thereof.
Claim 7
Dependent Claim
24 words
A catalyst according to claim 1 in which the secondary support is the in situ reaction product of added oxide with the primary support.
Claim 8
Dependent Claim
50 words
A catalyst 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 9
Dependent Claim
13 words
A catalyst according to claim 1 in which the primary support is cordierite.
Claim 10
Dependent Claim
62 words
A catalyst according to claim 1 having a cordierite primary support in the form of a multi-tubular matrix having 40 to 500 passages 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
34 words
A catalyst according to claim 1 in which the active material of the catalyst comprises metallic nickel or cobalt or an alloy of these, the catalyst being intended for reductive treatment of exhaust gas.
Claim 12
Dependent Claim
16 words
A catalyst according to claim 10 containing also copper, silver, platinum group metal or mixtures thereof.
Claim 13
Dependent Claim
30 words
A catalyst according to claim 11 in which copper is present in a content, calculated as CuO, of 2-10% of the nickel and cobalt and nickel/cobalt alloy calculated as monoxides.
Claim 14
Dependent Claim
37 words
A catalyst according to claim 1 in which the active material of the catalyst comprises one or more oxides of nickel, cobalt, copper, manganese or chromium and, the catalyst being intended for oxidative treatment of exhaust gas.
Claim 15
Dependent Claim
20 words
A catalyst according to claim 13 in which the active material of the catalyst comprises also a platinum group metal.
Claim 16
Independent Claim
112 words
A method of producing a catalyst of at least one non-noble metal or compound thereof on a support 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, chromia, manganese oxide, iron oxide and mixtures or compounds thereof substantially in combination with one or more basic oxides from the group consisting of calcium, strontium and barium which comprises the step of reacting secondary support precursor compounds together at an elevated temperature of over 800°C in the presence of a compound thermally decomposable to form a highly porous solid.
Claim 17
Independent Claim
112 words
A method of producing a catalyst of at least one non-noble metal or compound thereof on a support 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, chromia, manganese oxide, iron oxide and mixtures or compounds thereof substantially in combination with one or more basic oxides from the group consisting of calcium, strontium and barium which comprises the step of reacting secondary support precursor compounds together at an elevated temperature of over 800°C in the presence of a compound thermally decomposable to form a highly porous solid.
Claim 18
Dependent Claim
37 words
A method according to claim 15 in which the secondary support precursor mixture is heated by means of a stream of gas in which the oxidation of hydrogen, carbon monoxide, hydrocarbons or mixtures thereof is taking place.
Claim 19
Dependent Claim
25 words
A method according to claim 15 in which the gas is the exhaust, to which air has been added, from a rich-running internal combustion engine.
Claim 20
Dependent Claim
31 words
A method according to claim 15 in which the catalytic material precursors are compounds of a non-noble metal and the mixture is subjected to reduction before the reaction at elevated temperature.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |