Patent US4077913A successfully refreshed from Google Patents.
US4077913A
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Catalyst
Assignee: Johnson Matthey PLC
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Filing: 1976-01-21
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Granted: 1978-03-07
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Expires: 1996-01-21
Abstract
Abstract This invention relates to a catalyst suitable for use in the process of a) the reduction of an oxide of nitrogen present in a gas containing nitrogen, and b) for the oxidation of carbon monoxide or one or more organic compounds present in a gas. The catalyst comprises an inert material impregnated or coated with a mixture or alloy comprising 5-75 wt.% ruthenium, optionally 0-30 wt.% base metal and balance platinum in an amount not less than 5 wt.%.
Inventors
- 👤 Gary James Keith Acres
- 👤 Barry John Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:19
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/74; B01D53/86; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/462; B01J23/54; B01J23/56; B01J23/64; B01J23/70; B01J23/89; B01J35/00; B01J35/30; B01J35/50; B01J35/56; B01J2235/00; B01J2235/15; B01J29/00; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
88 words
A catalyst for use in oxidation or reduction reactions comprising an inert unitary structural support having deposited thereon a mixture or alloy comprising, apart from impurities, 5 to 75 wt.% ruthenium, from a trace to 30 wt.% base metal and balance platinum in an amount not less than 5 wt.%, the base metal being selected from the group consisting of Al, Mg, Cr, Mo, W, Mn, Fe, Re, Co, Ni, Ti, V, Cu, Ag, Zn, Cd, Hg, In, T1, Bi, Sn, Pb, Sb, the lanthanides and the actinides.
Claim 2
Dependent Claim
88 words
A catalyst for use in oxidation or reduction reactions comprising an inert unitary structural support having deposited thereon a mixture or alloy comprising, apart from impurities, 5 to 75 wt.% ruthenium, from a trace to 30 wt.% base metal and balance platinum in an amount not less than 5 wt.%, the base metal being selected from the group consisting of Al, Mg, Cr, Mo, W, Mn, Fe, Re, Co, Ni, Ti, V, Cu, Ag, Zn, Cd, Hg, In, T1, Bi, Sn, Pb, Sb, the lanthanides and the actinides.
Claim 3
Dependent Claim
17 words
A catalyst according to claim 1 wherein the mixture or alloy contains 5 to 65 wt.% ruthenium.
Claim 4
Dependent Claim
17 words
A catalyst according to claim 2 wherein the mixture or alloy contains 10 to 60 wt.% ruthenium.
Claim 5
Dependent Claim
17 words
A catalyst according to claim 2 wherein the mixture or alloy contains 5 to 45 wt.% ruthenium.
Claim 6
Dependent Claim
15 words
A catalyst according to claim 2 wherein the mixture or alloy contains 35 wt.% ruthenium.
Claim 7
Dependent Claim
17 words
A catalyst according to claim 2 wherein the mixture or alloy contains 5 to 10 wt.% ruthenium.
Claim 8
Dependent Claim
19 words
A catalyst according to claim 1 wherein the mixture or alloy contains a trace to 20 wt.% base metal.
Claim 9
Dependent Claim
33 words
A catalyst according to claim 1 wherein the inert support is pretreated with a porous refractory oxide which is unreactive with the inert support and before application thereto of the mixture or alloy.
Claim 10
Dependent Claim
33 words
A catalyst according to claim 8 wherein the refractory oxide is selected from the group consisting of oxides of scandium, yttrium, the lanthanides, Be, Mg, B, Al, Si, Ti, Zr, Hf and Th.
Claim 11
Dependent Claim
15 words
A catalyst according to claim 8 wherein the refractory oxide is an oxide of neodymium.
Claim 12
Dependent Claim
25 words
A catalyst according to claim 8 wherein the pretreatment is in the form of a continuous or discontinuous film of thickness 0.0004 to 0.001 inch.
Claim 13
Dependent Claim
15 words
A catalyst according to claim 1 wherein the inert support mode of a refractory compound.
Claim 14
Dependent Claim
52 words
A catalyst according to claim 12 wherein the refractory compound is selected from the group consisting of oxides of Mg, Ca, Sr, Ba, Al, Sc, Y, the lanthanides, the actinides, Ga, In, Tl, Si, Ti, Zr, Hf, Ge, Sn, Pb, V, Nb, Ta, Cr, Mo, W, transition metal carbides, borides and silicides.
Claim 15
Dependent Claim
18 words
A catalyst according to claim 12 wherein the refractory compound is in the form of a ceramic material.
Claim 16
Dependent Claim
20 words
A catalyst according to claim 12 wherein the inert support is a corrugated cellular structure made of a refractory compound.
Claim 17
Dependent Claim
12 words
A catalyst according to claim 12 wherein the support is a honeycomb.
Claim 18
Dependent Claim
30 words
A catalyst according to claim 14 wherein the ceramic material is selected from the group consisting of zircon-mullite, mullite, alpha alumina, sillimanite, magnesium silicates, zircon, petalite, spodumene, cordierite and alumino-silicates.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |