US4126580A
Expired / Lapsed
US
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Stable perovskite catalysts
Assignee: EIDP Inc
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Filing: 1976-12-15
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Granted: 1978-11-21
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Expires: 1996-12-15
Abstract
Abstract Perovskite catalysts of the general formula ABO 3 having increased stability through the incorporation of metals having low first ionization potentials, and their use in oxidation and reduction reactions.
Inventors
- 👤 Alan Lauder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:48
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/70; B01J23/89; B01J23/8933; Y; Y10; Y10S; Y10S502/00; Y10S502/525
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
190 words
In a catalytic metal oxide having the general formula ABO 3 and a perovskite crystal structure, in which A and B are each at least one metal cation in sites of type A and of type B, respectively, wherein: (1) the type A cation sites are occupied by metals each having an ionic radius between 0.8 and 1.65 A; (2) the type B cation sites are occupied by metals each having an ionic radius between 0.4 and 1.4 A; and (3) substantially equal numbers of metal cations occupy the sites of type A and of type B, the improvement wherein: (a) the Lattice Stability Index of the metal oxide is less than about 12.0 electron volts; (b) at least about 1% of the type B cation sites are occupied by cations of at least one catalytic metal of the platinum group or having an atomic number of from 24 to 29; and (c) at least about 10% of the type B cation sites are occupied by cations of at least one metal differing from the catalytic metal and having a first ionization potential of no greater than 7.1 electron volts.
Claim 2
Dependent Claim
190 words
In a catalytic metal oxide having the general formula ABO 3 and a perovskite crystal structure, in which A and B are each at least one metal cation in sites of type A and of type B, respectively, wherein: (1) the type A cation sites are occupied by metals each having an ionic radius between 0.8 and 1.65 A; (2) the type B cation sites are occupied by metals each having an ionic radius between 0.4 and 1.4 A; and (3) substantially equal numbers of metal cations occupy the sites of type A and of type B, the improvement wherein: (a) the Lattice Stability Index of the metal oxide is less than about 12.0 electron volts; (b) at least about 1% of the type B cation sites are occupied by cations of at least one catalytic metal of the platinum group or having an atomic number of from 24 to 29; and (c) at least about 10% of the type B cation sites are occupied by cations of at least one metal differing from the catalytic metal and having a first ionization potential of no greater than 7.1 electron volts.
Claim 3
Dependent Claim
28 words
A catalytic metal oxide of claim 1 wherein the catalytic metal is a platinum group metal occupying no more than about 20% of the type B cation sites.
Claim 4
Dependent Claim
33 words
A catalytic metal oxide of claim 1 wherein at least about 10% of the type B cation sites are occupied by cations of a metal having an atomic number of 24 to 29.
Claim 5
Dependent Claim
27 words
A catalytic metal oxide of claim 1 wherein cations of an alkali metal occupy at least about 10% of the type A or type B cation sites.
Claim 6
Dependent Claim
23 words
A catalytic metal oxide of claim 1 wherein 1 to 20% of the type B cation sites are occupied by ruthenium or platinum.
Claim 7
Dependent Claim
54 words
A catalytic metal oxide of claim 1 wherein at least 1% of the type B cation sites are occupied by at least one metal of the platinum group and at least 1% of the type B cation sites are occupied by at least one metal having an atomic number of from 24 to 29.
Claim 8
Dependent Claim
21 words
A catalytic metal oxide of claim 1 wherein aluminum ions occupy at least about 10% of the type B cation sites.
Claim 9
Dependent Claim
15 words
A catalytic metal oxide of claim 1 having the formula [Sr.sub.0.1 La.sub.0.9 ][Al.sub.0.9 Ru.sub.0.1) O.sub.3.
Claim 10
Dependent Claim
15 words
A catalytic metal oxide of claim 1 having the formula [Ba.sub.0.1 La.sub.0.9 ][Al.sub.0.9 Pt.sub.0.1 ]O.sub.3.
Claim 11
Dependent Claim
16 words
A catalytic metal oxide of claim 1 having the formula [Sr.sub.0.06 La.sub.0.94 ][Al.sub.0.8 Co.sub.0.16 Ru.sub.0.04 ]0.sub.3.
Claim 12
Dependent Claim
15 words
A catalytic metal oxide of claim 1 having the formula [Sr.sub.0.3 La.sub.0.7 ][Al.sub.0.7 Ru.sub.0.3 ]O.sub.3.
Claim 13
Dependent Claim
10 words
A catalytic composition of claim 1 on a shaped support.
Claim 14
Dependent Claim
12 words
A catalytic composition of claim 11 wherein the shaped support is alumina.
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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |