US4537873A
Expired / Lapsed
US
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Catalyst for catalytic combustion
Assignee: Hitachi Ltd
•
Filing: 1983-11-29
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Granted: 1985-08-27
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Expires: 2003-11-29
Abstract
Abstract A catalyst comprising precious metal particles supported on a carrier obtained from (a) titania as a first component and (b) as a second component at least one metal oxide selected from oxides of magnesium, strontium, lanthanum, yttrium, cerium, zirconium, silicon and tin, is effective for catalytic combustion of a fuel at a temperature of 400 DEG to 1500 DEG C. with excellent durability.
Inventors
- 👤 Akira Kato
- 👤 Tomoichi Kamo
- 👤 Shigeo Uno
- 👤 Hiroshi Kawagoshi
- 👤 Hisao Yamashita
- 👤 Shinpei Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:06
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/40
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
95 words
A catalyst for catalytic combustion consisting essentially of precious metal particles of at least one member selected from the group consisting of platinum, palladium, ruthenium, iridium and rhodium supported on a carrier obtained from (a) a first component of titania and (b) a second component of at least one metal oxide selected from the group consisting of oxides of magnesium, strontium, lanthanum, yttrium, cerium, zirconium, silicon and tin; the compositional ratio of the first component titania to the second component metal oxide is 1:0.05 to 1:≮1 in atomic ratio of Ti:metal of the second component.
Claim 2
Dependent Claim
95 words
A catalyst for catalytic combustion consisting essentially of precious metal particles of at least one member selected from the group consisting of platinum, palladium, ruthenium, iridium and rhodium supported on a carrier obtained from (a) a first component of titania and (b) a second component of at least one metal oxide selected from the group consisting of oxides of magnesium, strontium, lanthanum, yttrium, cerium, zirconium, silicon and tin; the compositional ratio of the first component titania to the second component metal oxide is 1:0.05 to 1:≮1 in atomic ratio of Ti:metal of the second component.
Claim 3
Dependent Claim
26 words
A catalyst according to claim 1, wherein the amount of said precious metal is 0.1 to 3% by weight based on the weight of the carrier.
Claim 4
Dependent Claim
15 words
A catalyst according to claim 1, wherein the second component of the carrier is magnesia.
Claim 5
Dependent Claim
15 words
A catalyst according to claim 1, wherein the second component of the carrier is zirconia.
Claim 6
Dependent Claim
23 words
A catalyst according to claim 3, wherein the composition ratio of titania to magnesia is 1:0.2 to 1:≮1 in atomic ratio of Ti:Mg.
Claim 7
Dependent Claim
16 words
A catalyst according to claim 1, wherein the second component of the carrier is strontium oxide.
Claim 8
Dependent Claim
16 words
A catalyst according to claim 1, wherein the second component of the carrier is lanthanum oxide.
Claim 9
Dependent Claim
15 words
A catalyst according to claim 1, wherein the second component of the carrier is yttria.
Claim 10
Dependent Claim
15 words
A catalyst according to claim 1, wherein the second component of the carrier is ceria.
Claim 11
Dependent Claim
15 words
A catalyst according to claim 1, wherein the second component of the carrier is silica.
Claim 12
Dependent Claim
16 words
A catalyst according to claim 1, wherein the second component of the carrier is stannic oxide.
Claim 13
Dependent Claim
17 words
A catalyst according to claim 1, wherein the second component of the carrier is zirconia and silica.
Claim 14
Dependent Claim
17 words
A catalyst according to claim 1, wherein the second component of the carrier is zirconia and ceria.
Claim 15
Dependent Claim
18 words
A catalyst according to claim 1, wherein the second component of the carrier is magnesia and lanthanum oxide.
Claim 16
Dependent Claim
21 words
A catalyst according to claim 1, wherein the second component of the carrier is a mixture of zirconia and lanthanum oxide.
Claim 17
Dependent Claim
32 words
A catalyst according to claim 1, wherein the second component is at least one metal oxide selected from the group consisting of oxides of magnesium, strontium, lanthanum, yttrium, cerium, silicon and tin.
Claim 18
Dependent Claim
109 words
A catalyst for catalytic combustion consisting of precious metal particles of at least one member selected from the group consisting of platinum, palladium, ruthenium, iridium and rhodium and at least one member selected from the group consisting of nickel, cobalt, manganese and chromium supported on a carrier obtained from (a) a first component of titania and (b) a second component of at least one metal oxide selected from the group consisting of oxides of magnesium, strontium, lanthanum, yttrium, cerium, silicon and tin; the compositional ratio of the first component titania to the second component metal oxide being 1:0.05 to 1:≮1 in atomic ratio of Ti:metal of the second component.
Claim 19
Dependent Claim
109 words
A catalyst for catalytic combustion consisting of precious metal particles of at least one member selected from the group consisting of platinum, palladium, ruthenium, iridium and rhodium and at least one member selected from the group consisting of nickel, cobalt, manganese and chromium supported on a carrier obtained from (a) a first component of titania and (b) a second component of at least one metal oxide selected from the group consisting of oxides of magnesium, strontium, lanthanum, yttrium, cerium, silicon and tin; the compositional ratio of the first component titania to the second component metal oxide being 1:0.05 to 1:≮1 in atomic ratio of Ti:metal of the second component.
Claim 20
Dependent Claim
28 words
A catalyst according to claim 17, wherein the amount of the precious metal particles if from 0.1 to 3% by weight based on the weight of the carrier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |