US3929670A
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Catalyst
Assignee: Hitachi Ltd
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Filing: 1973-08-24
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Granted: 1975-12-30
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Expires: 1993-08-24
Abstract
Abstract A catalyst suitable for reducing nitrogen oxides, for oxidizing combustible gases contained in the exhaust gas from internal combustion engines, boilers, etc., and for chemical production processes conducted on an industrial scale, for example, production of ethylene oxide from ethylene consists essentially of a metal oxide composition represented by the following general formula
Inventors
- 👤 Tetsuichi Kudo
- 👤 Tetsuo Gejyo
- 👤 Kazuetsu Yoshida
- 👤 Michiharu Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:48
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/002; B01J23/70; B01J23/76; B01J23/83; H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; B01J2523/00; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
14 words
A CATALYST CONSISTING ESSENTIALLY OF A METAL OXIDE COMPOSITION REPRESENTED BY THE GENERAL FORMULA:
Claim 2
Dependent Claim
14 words
A CATALYST CONSISTING ESSENTIALLY OF A METAL OXIDE COMPOSITION REPRESENTED BY THE GENERAL FORMULA:
Claim 3
Dependent Claim
19 words
The catalyst according to claim 1, wherein the metal oxide composition has a crystal structure of the K2MgF4 type.
Claim 4
Dependent Claim
17 words
The catalyst according to claim 1, wherein the metal oxide composition is supported on a ceramic support.
Claim 5
Dependent Claim
26 words
The catalyst according to claim 3, wherein the ceramic support is a member selected from the group consisting of alumina, zirconia, magnesia, silica, alumina-silica and thoria.
Claim 6
Dependent Claim
58 words
A catalyst suitable as a gas cleaning agent for an exhaust gas containing nitrogen oxides and/or combustible gases, which consists essentially of a metal oxide composition represented by the general formula: La2Cu1-yMyO4 wherein M is at least one element selected from the group consisting of aluminum and zirconium, and y is a number of from 0.2 to 0.6.
Claim 7
Dependent Claim
58 words
A catalyst suitable as a gas cleaning agent for an exhaust gas containing nitrogen oxides and/or combustible gases, which consists essentially of a metal oxide composition represented by the general formula: La2Cu1-yMyO4 wherein M is at least one element selected from the group consisting of aluminum and zirconium, and y is a number of from 0.2 to 0.6.
Claim 8
Dependent Claim
12 words
The catalyst according to claim 2, wherein x is greater than 0.
Claim 9
Dependent Claim
16 words
The catalyst according to claim 6, wherein the metal composition is supported on a ceramic support.
Claim 10
Dependent Claim
10 words
The catalyst according to claim 6, wherein M is aluminum.
Claim 11
Dependent Claim
10 words
The catalyst according to claim 6, wherein M is zirconium.
Claim 12
Dependent Claim
26 words
The catalyst according to claim 7, wherein the ceramic support is a member selected from the group consisting of alumina, zirconia, magnesia, silica, alumina-silica and thoria.
Claim 13
Dependent Claim
17 words
The catalyst according to claim 2, wherein the metal oxide composition is supported on a ceramic support.
Claim 14
Dependent Claim
26 words
The catalyst according to claim 11, wherein the ceramic support is a member selected from the group consisting of alumina, zirconia, magnesia, silica, alumina-silica and thoria.
Claim 15
Dependent Claim
28 words
The catalyst according to claim 2, wherein x is 2, and further wherein A is selected from the group consisting of Pr, Nb, Pm, Sm, Eu and Gd.
Claim 16
Dependent Claim
28 words
The catalyst according to claim 2, wherein M is selected from the group consisting of Zr, Ni, Mn, Cr, Fe, Co, Sn, W, Mo, Al, Zn and Li.
Claim 17
Dependent Claim
13 words
The catalyst according to claim 2, wherein y is about 0.2 to 0.6.
Claim 18
Dependent Claim
35 words
The catalyst according To claim 2, wherein M is at least two elements selected from the group consisting of lithium, aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, gallium, zirconium, tin, molybdenum and tungsten.
Claim 19
Dependent Claim
33 words
The catalyst according to claim 16, wherein A is at least two elements selected from the group consisting of lanthanides having an atomic number of 59 to 71, yttrium and alkaline earth metals.
Claim 20
Dependent Claim
9 words
The catalyst of claim 2, wherein M is aluminum.
Claim 21
Dependent Claim
19 words
The catalyst according to claim 5, wherein the metal oxide composition has a crystal structure of the K2MgF4 type.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |