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US4049583A
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Metal oxide catalytic compositions having perovskite crystal structures and containing metals of the platinum group
Assignee: EIDP Inc
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Filing: 1976-05-24
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Granted: 1977-09-20
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Expires: 1996-05-24
Abstract
Abstract Metal oxides of the type [A 1 1-x A 2 x ]B' 1-y Me y ]O 3 having perovskite-type crystal structures in which A 1 and A 2 are each one or more mono-, di-, or trivalent metals having ionic radii between about 0.8 and 1.65 Angstroms; B' is one or more metals having ionic radii between about 0.4 and 1.4 Angstroms; Me is one or more metals of the platinum group (ruthenium, osmium, rhodium, iridium, palladium, and platinum); x is between about 0.01 and 0.99; and y is between about 0.01 and 0.20 Are useful as catalysts for the oxidation of hydrocarbons and carbon monoxide and for the reduction of nitrogen oxides under conditions typical of those involved in the cleanup of the exhaust gases of internal combustion engines.
Inventors
- 👤 Alan Lauder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:57
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9459; B01D53/74; B01D53/86; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/002; B01J23/70; B01J23/89; B01J23/8933; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1026; B01D2255/20; B01D2255/204; B01D2255/206; B01D2255/2063; B01D2255/207; B01D2255/20738; B01D2255/20746; B01D2255/20753; B01D2255/90; B01D2255/92; B01D2255/9202; B01J2523/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S502/00; Y10S502/525
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
A compound having the perovskite-type ABO 3 crystal structure wherein 1. the sites of Type A are occupied by cations of at least two different metals each occupying at least 1% of the Type A cation sites and having an ionic radius between 0.8 and 1.65 A; and 2. from about 1% up to about 20% of the sites of Type B are occupied by ions of platinum group metals and the remaining sites of Type B are occupied by ions of nonplatinum group metals having ionic radii between about 0.4 and 1.4 A.;
Claim 2
Dependent Claim
94 words
A compound having the perovskite-type ABO 3 crystal structure wherein 1. the sites of Type A are occupied by cations of at least two different metals each occupying at least 1% of the Type A cation sites and having an ionic radius between 0.8 and 1.65 A; and 2. from about 1% up to about 20% of the sites of Type B are occupied by ions of platinum group metals and the remaining sites of Type B are occupied by ions of nonplatinum group metals having ionic radii between about 0.4 and 1.4 A.;
Claim 3
Dependent Claim
27 words
A compound of claim 1 wherein at least about 50% of the remaining sites of Type B are occupied by non-platinum metal group ions of variable valence.
Claim 4
Dependent Claim
21 words
A compound of claim 2 wherein said metal ions of variable valence have atomic number of from 22 to 29 inclusive.
Claim 5
Dependent Claim
18 words
A compound of claim 3 wherein said metal ions of variable valence are iron, nickel or cobalt ions.
Claim 6
Dependent Claim
32 words
A compound of claim 1 wherein said metal ions occupying sites of Type A are selected from ions of potassium, strontium, barium, lanthanum or metals of atomic number 58 to 71, inclusive.
Claim 7
Dependent Claim
18 words
A compound of claim 1 wherein said ions of platinum metals are ions of ruthenium or platinum groups.
Claim 8
Dependent Claim
60 words
A compound of claim 2 wherein at least 5% of the said remaining sites of Type B are occupied by metal ions of a variable valence in a first valence and at least a further 5% of the said remaining sites of Type B are occupied by ions of the same metal of variable valence in a second valence state.
Claim 9
Dependent Claim
24 words
A compound of claim 2 wherein all of the remaining sites of Type B are occupied by nonplatinum group metal ions of variable valence
Claim 10
Dependent Claim
31 words
A compound of claim 1 wherein at least about 50% of the said remaining sites of Type B are occupied by ions of nonplatinum group metals having a single fixed valence.
Claim 11
Dependent Claim
18 words
A compound of claim 9 wherein said metal is a metal of Group IIIa of the Periodic Table.
Claim 12
Dependent Claim
10 words
A compound of claim 10 wherein said metal is aluminum.
Claim 13
Dependent Claim
12 words
A catalyst comprising a compound of claim 1 on a shaped support.
References Cited (Backward Citations)
US3900428A
Cited
US3901828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |