US3899444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas catalyst support
Assignee: Ethyl Corp
•
Filing: 1972-12-22
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Granted: 1975-08-12
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Expires: 1992-12-22
Abstract
Abstract A thermally stable and attrition resistant catalyst support consisting essentially of an alumina coating on an inert substrate. The alumina coating has a rare earth metal oxide substantially uniformly distributed throughout. Catalyst compositions utilizing this support, processes for preparing both support and catalyst, and a method of treating internal combustion engine exhaust gases and preventing crystallization of alumina are disclosed. Catalysts consisting essentially of an alumina matrix containing rare earth metal oxide and a catalytic metal oxide are also disclosed. The atom ratio of rare earth metal to aluminum in the support is 1:5.7-25. The atom ratio of catalytic metal to rare earth metal to aluminum in the catalysts is 1:0.8-1.4:8-20.
Inventors
- 👤 Ruth E Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:57
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J23/00; B01J23/10; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6562; B01J23/70; B01J23/76; B01J23/83; B01J23/89; B01J23/8933; B01J23/894; B01J37/00; B01J37/0009; B01J37/02; B01J37/0215; B01J37/023; B01J37/024; B01J37/0242; B01J2523/00
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
92 words
A CATALYST USEFUL IN TREATING EXHAUST GAS OF INTERNAL COMBUSTION ENGINES, SAID CATALYST CONSISTING ESSENTIALLY OF AN ALUMINA MATRIX CONTAINING A CATALYTIC METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS I-B, V-B, VI-B, VII-B AND VIII OF THE PERIODIC TABLE IN AN OXIDE FORM AND A RARE EARTH METAL OXIDE, THE ATOM RATIO OF SAID CATALYTIC METAL TO SAID RARE EARTH METAL TO ALUMINUM BEING 0,1- 1 TO 0.8- 4 TO 8-20, SAID CATALYTIC METAL OXIDE AND RARE EARTH METAL OXIDE BEING SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT SAID ALUMINA MATRIX.
Claim 2
Dependent Claim
92 words
A CATALYST USEFUL IN TREATING EXHAUST GAS OF INTERNAL COMBUSTION ENGINES, SAID CATALYST CONSISTING ESSENTIALLY OF AN ALUMINA MATRIX CONTAINING A CATALYTIC METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF GROUPS I-B, V-B, VI-B, VII-B AND VIII OF THE PERIODIC TABLE IN AN OXIDE FORM AND A RARE EARTH METAL OXIDE, THE ATOM RATIO OF SAID CATALYTIC METAL TO SAID RARE EARTH METAL TO ALUMINUM BEING 0,1- 1 TO 0.8- 4 TO 8-20, SAID CATALYTIC METAL OXIDE AND RARE EARTH METAL OXIDE BEING SUBSTANTIALLY UNIFORMLY DISTRIBUTED THROUGHOUT SAID ALUMINA MATRIX.
Claim 3
Dependent Claim
21 words
A catalyst of claim 1 wherein said atom ratio of catalytic metal to rare earth metal to aluminum is about 1:1:8-20.
Claim 4
Dependent Claim
16 words
A catalyst of claim 2 wherein said rare earth metal oxide consists mainly of lanthanum oxide.
Claim 5
Dependent Claim
15 words
A catalyst of claim 1 wherein said catalytic metal is copper in an oxide form.
Claim 6
Dependent Claim
20 words
A catalyst of claim 1 wherein said catalytic metal is the combination of copper in an oxide form and palladium.
Claim 7
Dependent Claim
16 words
A catalyst of claim 5 wherein said rare earth metal oxide consists mainly of lanthanum oxide.
Claim 8
Dependent Claim
15 words
A catalyst of claim 5 wherein said rare earth metal oxide consists of praseodymium oxide.
Claim 9
Dependent Claim
30 words
A catalyst of claim 5 wherein said rare earth metal oxide consists of a mixture of rare earth metal oxides composed mainly of lanthanum oxide, praseodymium oxide and neodymium oxide.
Claim 10
Dependent Claim
15 words
A catalyst of claim 1 wherein said catalytic metal is manganese in an oxide form.
Claim 11
Dependent Claim
20 words
A catalyst of claim 1 wherein said catalytic metal is the combination of manganese in an oxide form and palladium.
Claim 12
Dependent Claim
15 words
A catalyst of claim 10 wherein said rare earth metal oxide is mainly lanthanum oxide.
Claim 13
Dependent Claim
15 words
A catalyst of claim 10 wherein said rare earth metal oxide is mainly praseodymium oxide.
Claim 14
Dependent Claim
30 words
A catalyst of claim 10 wherein said rare earth metal oxide consists of a mixture of rare earth metal oxides composed mainly of lanthanum oxide, praseodymium oxide and neodymium oxide.
Claim 15
Dependent Claim
15 words
A catalyst of claim 1 wherein said catalytic metal is vanadium in an oxide form.
Claim 16
Dependent Claim
23 words
A catalyst of claim 1 wherein said catalytic metal is a combination of copper and vanadium, both in an oxide form, and palladium.
Claim 17
Dependent Claim
100 words
A CATALYST OF CLAIM 1 WHEREIN SAID ALUMINA MATRIX CONSISTS ESSENTIALLY OF AN ALUMINA COATING ON THE SURFACE OF A REFRACTORY SELECTED FROM THE GROUP CONSISTING OF ZIRCONIA, ALUMINA, MAGNESIA, SILICIA, AND MIXTURES THEREOF, SAID ALUMINA COATING CONTAINING A CATALYTIC METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OFGROUPS 1-B, V-B, VI-B, VII-B AND VIII OF THE PERIODIC TABLE IN AN OXIDE FORM AND A RARE EARTH METAL OXIDE SUBSTANTIALLY UNIFOMRLY DISTRIBUTED IN SAID MATRIX THE ATOM RATIO OF SAID CATALYTIC METAL TO SAID RARE EARTH METAL TO ALUMINUM IN SAID ALUMINA COATING BEING 0.1 TO 0.8-1.4 TO 8-20.
Claim 18
Dependent Claim
13 words
A catalyst of claim 16 wherein said atom ratio is about 1:1: 8-20.
Claim 19
Dependent Claim
13 words
A catalyst of claim 16 wherein said refractory is a monolithic aluminum silicate.
Claim 20
Dependent Claim
11 words
A catalyst of claim 18 wherein said aluminum silicate is mullite.
Claim 21
Dependent Claim
14 words
A catalyst of claim 16 wherein said refractory is a monolithic aluminum magnesium silicate.
Claim 22
Dependent Claim
11 words
A catalyst of claim 16 wherein said refractory is an alumina.
Claim 23
Dependent Claim
15 words
A catalyst of claim 21 wherein said catalytic metal is copper in an oxide form.
Claim 24
Dependent Claim
16 words
A catalyst of claim 22 wherein said rare earth metal oxide consists mainly of lanthanum oxide.
Claim 25
Dependent Claim
13 words
A catalyst of claim 23 wherein said atom ratio is about 1:1: 8-20.
Claim 26
Dependent Claim
20 words
A catalyst of claim 21 wherein said catalytic metal is the combination of copper in an oxide form and palladium.
Claim 27
Dependent Claim
16 words
A catalyst of claim 25 wherein said rare earth metal oxide consists mainly of lanthanum oxide.
Claim 28
Dependent Claim
13 words
A catalyst of claim 26 wherein said atom ratio is about 1:1: 8-20.
Claim 29
Dependent Claim
15 words
A catalyst of claim 21 wherein said catalytic metal is manganese in an oxide form.
Claim 30
Dependent Claim
16 words
A catalyst of claim 28 wherein said rare earth metal oxide consists mainly of lanthanum oxide.
Claim 31
Dependent Claim
13 words
A catalyst of claim 29 wherein said atom ratio is about 1:1: 8-20.
Claim 32
Dependent Claim
20 words
A catalyst of claim 21 wherein said catalytic metal is the combination of manganese in an oxide form and palladium.
Claim 33
Dependent Claim
16 words
A catalyst of claim 31 wherein said rare earth metal oxide consists mainly of lanthanum oxide.
Claim 34
Dependent Claim
13 words
A catalyst of claim 32 wherein said atom ratio is about 1:1: 8-20.
Claim 35
Dependent Claim
15 words
A catalyst of claim 21 wherein said catalytic metal is vanadium in an oxide form.
Claim 36
Dependent Claim
23 words
A catalyst of claim 21 wherein said catalytic metal is the combination of vanadium and copper, both in an oxide form, and palladium.
Claim 37
Dependent Claim
59 words
A catalyst consisting essentially of an alumina carrier impregnated with an aqueous solution or slurry of an aluminum compound decomposable to alumina, a rare earth metal compound decomposable to an oxide and a catalytic metal compound, the atom ratio of catalytic metal to rare earth metal to aluminum in said solution or slurry being 0.1-1 to 0.8-1.4 to 8-20.
Claim 38
Dependent Claim
59 words
A catalyst consisting essentially of an alumina carrier impregnated with an aqueous solution or slurry of an aluminum compound decomposable to alumina, a rare earth metal compound decomposable to an oxide and a catalytic metal compound, the atom ratio of catalytic metal to rare earth metal to aluminum in said solution or slurry being 0.1-1 to 0.8-1.4 to 8-20.
Claim 39
Dependent Claim
13 words
A catalyst of claim 26 wherein said alumina carrier contains 1-20 percent silica.
Claim 40
Dependent Claim
24 words
A catalyst of claim 37 wherein said aluminum compound is aluminum nitrate and said rare earth metal compound is a rare earth metal nitrate.
Claim 41
Dependent Claim
18 words
A catalyst of claim 38 wherein said catalytic metal compound is a copper compound decomposable to copper oxide.
Claim 42
Dependent Claim
18 words
A catalyst of claim 39 further characterized by being impregnated with a promoter amount of a palladium coMpound.
Claim 43
Dependent Claim
17 words
A catalyst of claim 38 wherein said catalytic metal compound is manganese compound decomposable to manganese oxide.
Claim 44
Dependent Claim
18 words
A catalyst of claim 41 further characterized by being impregnated with a promoter amount of a palladium compound.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |