US4088604A
Expired / Lapsed
US
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Catalyst for the decomposition of nitrogen oxides
Assignee: Johnson Matthey PLC
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Filing: 1976-11-09
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Granted: 1978-05-09
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Expires: 1996-11-09
Abstract
Abstract This invention relates to catalysts which may be used in the purification of air and other gaseous media. More particularly, the invention relates to catalysts which may be used in the decomposition of one or more of the oxides of nitrogen comprising a mixed oxide of iron and cobalt selected from the group consisting of (a) Co x II FE 1-x II Fe 2 III O 4 where x normally has values of o≦x≦1 and (b) Co II Co.sub.(x-1) III Fe.sub.(3-x) III O 4 where x normally has values 1≦x≦3.
Inventors
- 👤 Paul A. Sermon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:45
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J23/74
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A catalyst material for the decomposition of one or more oxides of nitrogen comprising a ceramic or metal catalyst substrate having deposited thereon a first layer comprising an adherent oxide coating and having on said first layer a layer of a catalyst consisting essentially of a mixed oxide selected from the group of mixed oxides consisting of Co 1/2 II Fe 1/2 II Fe 2 III O 4 ; Co II Fe 2 III O 4 ; Co II Co III Fe III O 4 ; and Co II Co 2 III O 4 .
Claim 2
Dependent Claim
95 words
A catalyst material for the decomposition of one or more oxides of nitrogen comprising a ceramic or metal catalyst substrate having deposited thereon a first layer comprising an adherent oxide coating and having on said first layer a layer of a catalyst consisting essentially of a mixed oxide selected from the group of mixed oxides consisting of Co 1/2 II Fe 1/2 II Fe 2 III O 4 ; Co II Fe 2 III O 4 ; Co II Co III Fe III O 4 ; and Co II Co 2 III O 4 .
Claim 3
Dependent Claim
100 words
A catalyst for the decomposition of one or more oxides of nitrogen comprising a support of an inert unitary porous refractory ceramic honeycomb having deposited thereon a first layer of high surface area catalytically active refractory metal oxide and having on said first layer a layer of a catalyst consisting essentially of a mixed oxide selected from the group of mixed oxides consisting of (a) Co x II Fe 1-x II Fe 2 III O 4 where x is 0, 0.5 or 1 and (b) Co II Co.sub.(x-1) III Fe.sub.(3-x) III O 4 where x is 1, 2 or 3.
Claim 4
Dependent Claim
100 words
A catalyst for the decomposition of one or more oxides of nitrogen comprising a support of an inert unitary porous refractory ceramic honeycomb having deposited thereon a first layer of high surface area catalytically active refractory metal oxide and having on said first layer a layer of a catalyst consisting essentially of a mixed oxide selected from the group of mixed oxides consisting of (a) Co x II Fe 1-x II Fe 2 III O 4 where x is 0, 0.5 or 1 and (b) Co II Co.sub.(x-1) III Fe.sub.(3-x) III O 4 where x is 1, 2 or 3.
Claim 5
Dependent Claim
21 words
A catalyst according to claim 1, wherein the catalyst material is dispersed within the said first layer of refractory metal oxide.
Claim 6
Dependent Claim
29 words
A catalyst according to claim 2, wherein the ceramic support is made from zircon-mullite, mullite, alpha alumina, sillimanite, magnesium silicates, kaolin clays, zircon, petalite, spodumene, cordierite or an alumino-silicate.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |