US4170573A
Expired / Lapsed
US
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Rare earth and platinum group metal catalyst compositions
Assignee: WR Grace and Co Conn
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Filing: 1978-04-07
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Granted: 1979-10-09
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Expires: 1998-04-07
Abstract
Abstract A catalyst composition comprising a composite of ceria, lanthana, and alumina and a catalytically-effective amount of one or more platinum group metals deposited on the composite is disclosed. The composite is prepared by depositing a cerium compound on a calcined admixture of the lanthana and the alumina and calcining the composite. The catalyst is capable of operating in the combustion of carbonaceous fuel at high temperatures, e.g., greater than 2400 DEG F. (1317 DEG C.), for extended periods of time such as 20 hours with low emissions of carbon monoxide and nitrogen oxides.
Inventors
- 👤 Michael V. Ernest
- 👤 James M. Maselli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:06
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
80 words
A catalyst composition comprising (a) a composite of from about 1 to about 25 weight percent ceria, from about 1 to about 10 weight percent lanthana, and from about 65 to about 98 weight percent alumina, said composite prepared by depositing a solution of a cerium compound on a calcined admixture of a lanthanum compound and an aluminum compound and calcining the composite; and (b) a catalytically-effective amount of one or more platinum group metals deposited on the calcined composite.
Claim 2
Dependent Claim
80 words
A catalyst composition comprising (a) a composite of from about 1 to about 25 weight percent ceria, from about 1 to about 10 weight percent lanthana, and from about 65 to about 98 weight percent alumina, said composite prepared by depositing a solution of a cerium compound on a calcined admixture of a lanthanum compound and an aluminum compound and calcining the composite; and (b) a catalytically-effective amount of one or more platinum group metals deposited on the calcined composite.
Claim 3
Dependent Claim
20 words
The catalyst composition of claim 1 in which the composite contains from about 3 to about 10 weight percent ceria.
Claim 4
Dependent Claim
24 words
The catalyst composition of claim 1 in which the calcined admixture has a surface area of at least about 25 square meters per gram.
Claim 5
Dependent Claim
24 words
The catalyst composition of claim 1 in which the calcined composite has a surface area of at least about 25 square meters per gram.
Claim 6
Dependent Claim
26 words
The catalyst composition of claim 1 further comprising a substrate on which the one or more platinum group metals deposited on the calcined composite are coated.
Claim 7
Dependent Claim
13 words
The catalyst composition of claim 5 in which the substrate is a honeycomb.
Claim 8
Dependent Claim
14 words
The catalyst composition of claim 5 in which the substrate is in particulate form.
Claim 9
Dependent Claim
21 words
The catalyst composition of claim 1 in which the composite is calcined at a temperature of at least about 1800° F.
Claim 10
Dependent Claim
22 words
The catalyst composition of claim 8 in which the composite is calcined at a temperature of about 1800° to about 2400° F.
Claim 11
Dependent Claim
36 words
The catalyst composition of claim 1 in which the one or more platinum group metals are deposited on the calcined composite in an amount from about 0.05 to about 10 percent by weight of said composite.
Claim 12
Dependent Claim
37 words
The catalyst composition of claim 1 in which the one or more platinum group metals are deposited on the calcined composite in an amount of from about 0.2 to about 6 percent by weight of said composite.
Claim 13
Dependent Claim
21 words
The catalyst composition of claim 1 in which the platinum group metals are a mixture of platinum metal and iridium metal.
Claim 14
Independent Claim
98 words
A method of preparing a catalyst composition comprising (1) forming an admixture of an aluminum compound and a lanthanum compound; (2) calcining the admixture at a temperature of at least about 1800° F.; (3) depositing a solution of a cerium compound on the calcined admixture to form a composite; (4) calcining the composite at a temperature of at least about 1800° F.; (5) depositing a catalytically-effective amount of one or more platinum group metals, compounds, or complexes on the calcined composite; and (6) calcining the resulting composition at a temperature of from about 500° to about 1400° F.
Claim 15
Independent Claim
98 words
A method of preparing a catalyst composition comprising (1) forming an admixture of an aluminum compound and a lanthanum compound; (2) calcining the admixture at a temperature of at least about 1800° F.; (3) depositing a solution of a cerium compound on the calcined admixture to form a composite; (4) calcining the composite at a temperature of at least about 1800° F.; (5) depositing a catalytically-effective amount of one or more platinum group metals, compounds, or complexes on the calcined composite; and (6) calcining the resulting composition at a temperature of from about 500° to about 1400° F.
Claim 16
Dependent Claim
13 words
The method of claim 13 in which the aluminum compound is activated alumina.
Claim 17
Dependent Claim
19 words
The method of claim 14 further comprising leaching the activated alumina with an aqueous acidic solution before step (1).
Claim 18
Dependent Claim
21 words
The method of claim 13 in which the admixture is calcined at a temperature from about 1800° to about 2400° F.
Claim 19
Dependent Claim
21 words
The method of claim 13 in which the composite is calcined at a temperature from about 1800° to about 2400° F.
Claim 20
Dependent Claim
13 words
The method of claim 13 further comprising depositing the composition on a substrate.
Claim 21
Dependent Claim
12 words
The method of claim 18 in which the substrate is a honeycomb.
Claim 22
Dependent Claim
13 words
The method of claim 18 in which the substrate is in particulate form.
Claim 23
Dependent Claim
35 words
The method of claim 13 in which the one or more platinum group metals are deposited on the calcined composite in an amount from about 0.05 to about 10 percent by weight of said composite.
Claim 24
Dependent Claim
36 words
The method of claim 13 in which the one or more platinum group metals are deposited on the calcined composite in an amount of from about 0.2 to about 6 percent by weight of said composite.
Claim 25
Dependent Claim
20 words
The method of claim 13 in which the platinum group metals are a mixture of platinum metal and iridium metal.
Claim 26
Dependent Claim
60 words
The method of claim 13 in which the cerium compound is deposited on the calcined admixture of the lanthana and the alumina in an amount sufficient to form a calcined composite of from about 1 to about 25 weight percent ceria, from about 1 to about 10 weight percent lanthana, and from about 65 to about 98 weight percent alumina.
Claim 27
Dependent Claim
27 words
The method of claim 13 in which the one or more platinum group metals are deposited on the calcined composite as an ammonium sulfito complex or complexes.
Claim 28
Dependent Claim
158 words
A catalyst composition for the combustion of carbonaceous fuel comprising (a) a composite of from about 1 to about 25 weight percent ceria, from about 1 to about 10 weight percent lanthana, and from about 65 to about 98 weight percent alumina, said composite having a surface area of at least about 25 square meters per gram and prepared by impregnating finely divided, acid-leached, activated alumina with an aqueous solution of a thermally decomposable lanthanum salt, calcining the resulting admixture at a temperature of from about 1800° to about 2400° F., impregnating the calcined admixture with an aqueous solution of a thermally decomposable cerium salt, and calcining the resulting composite at a temperature of from about 1800° to about 2400° F.; (b) a catalytically-effective amount of one or more platinum group metals deposited on the calcined composite; and (c) a honeycomb substrate on which the one or more platinum group metals deposited on the calcined composite are coated.
Claim 29
Dependent Claim
158 words
A catalyst composition for the combustion of carbonaceous fuel comprising (a) a composite of from about 1 to about 25 weight percent ceria, from about 1 to about 10 weight percent lanthana, and from about 65 to about 98 weight percent alumina, said composite having a surface area of at least about 25 square meters per gram and prepared by impregnating finely divided, acid-leached, activated alumina with an aqueous solution of a thermally decomposable lanthanum salt, calcining the resulting admixture at a temperature of from about 1800° to about 2400° F., impregnating the calcined admixture with an aqueous solution of a thermally decomposable cerium salt, and calcining the resulting composite at a temperature of from about 1800° to about 2400° F.; (b) a catalytically-effective amount of one or more platinum group metals deposited on the calcined composite; and (c) a honeycomb substrate on which the one or more platinum group metals deposited on the calcined composite are coated.
Claim 30
Dependent Claim
21 words
The catalyst composition of claim 26 in which the platinum group metals are a mixture of platinum metal and iridium metal.
Claim 31
Dependent Claim
25 words
The method of claim 18 further comprising calcining the composition deposited on the substrate at a temperature of from about 500° to about 1400° F.
References Cited (Backward Citations)
US3993572A
Cited
US3966391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |