US4297331A
Expired / Lapsed
US
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Catalysis
Assignee: Johnson Matthey PLC
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Filing: 1980-06-11
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Granted: 1981-10-27
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Expires: 2000-06-11
Abstract
Abstract This invention relates to catalysts and more particularly to the catalyst decomposition of one or more oxides of nitrogen present in a gas stream by contacting the gas with a catalyst comprising a compound of the formula A x B y , where A is selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Th, and U, B is selected from the group consisting of B, C, N and Si, x has a value 1≦x≦7 and y has a value 1≦y≦4.
Inventors
- 👤 Paul A. Sermon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:06
CPC Classifications
B; B01; B01J; B01J21/00; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J27/00; B01J27/20; B01J27/22; B01J27/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
A method for the decomposition of NO present in a gas stream which comprises contacting the gas with a catalyst consisting essentially of a compound selected from the group consisting of TiB 2 , ZrB 2 , MoB, WB, Ta 2 N, BN, MoSi 2 and WSi 2 .
Claim 2
Independent Claim
49 words
A method for the decomposition of NO present in a gas stream which comprises contacting the gas with a catalyst consisting essentially of a compound selected from the group consisting of TiB 2 , ZrB 2 , MoB, WB, Ta 2 N, BN, MoSi 2 and WSi 2 .
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the catalyst is supported on a carrier made from a ceramic or metallic material.
Claim 4
Dependent Claim
25 words
A method according to claim 2 wherein the carrier is in the form of pellets, granules, spherules, powders, wire mesh, monoliths or corrugated metallic substrates.
Claim 5
Dependent Claim
32 words
A method according to claim 3 wherein the monolith is made from a ceramic material selected from zirconmullite, alpha alumina, sillimanite, magnesium silicates, kaolin clays, zircon, petalite, spodumene, cordierite and most alumino-silicates.
Claim 6
Dependent Claim
16 words
A method according to claim 3 wherein the monolith is in the form of a honeycomb.
Claim 7
Dependent Claim
30 words
A method according to claim 5 including a layer of high surface area catalytically active refractory metal oxide applied to the carrier prior to application thereto of the catalyst compound.
Claim 8
Dependent Claim
44 words
A method according to claim 6 wherein the said refractory metal oxide is selected from the group consisting of alumina, silica, titania, zirconia, hafnia, thoria, beryllia, magnesia, chromia, or boria but may also comprise oxygen containing anions such as chromate, phosphate, silicate and nitrate.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |