US3660028A
Expired / Lapsed
US
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Ammonia synthesis catalyst
Assignee: The University of Tokyo
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Filing: 1970-02-06
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Granted: 1972-05-02
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Expires: 1990-02-06
Abstract
Abstract The present invention provides a novel catalyst and improved process for direct synthesis of ammonia from nitrogen and hydrogen which comprises employing a complex of alkali metal or organo-alkali metal with graphite, said organo-alkali metal being an alkali metal benzophenone ketyl or an alkali metal salt of an aromatic hydrocarbon.
Inventors
- 👤 Kenzi Tamaru
- 👤 Takaharu Onishi
- 👤 Mitsuyuki Soma
- 👤 Mizuo Sudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/04; C01C1/0405; C01C1/0411; B; B01; B01J; B01J21/00; B01J21/18; B01J31/00; B01J31/02; B01J31/0201; B01J31/0211; B01J31/12; B01J31/122; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
23 words
A process according to claim 1 wherein the alkali metal is selected from the group consisting of lithium, sodium, potassium, rubidium and cesium.
Claim 2
Dependent Claim
32 words
A process according to claim 2 wherein the graphite-alkali metal complex is obtained by heating a mixture of graphite and alkali metal to at least the melting point of the alkali metal.
Claim 3
Dependent Claim
37 words
A process according to claim 3 wherein the graphite-alkali metal complex is obtained by reacting about 2 parts by weight graphite powder with about 2 parts by weight alkali metal at about 300* C. in a vacuum.
Claim 4
Dependent Claim
36 words
A process according to claim 3 wherein the graphite-alkali metal complex is obtained By reacting about 2 parts by weight of graphite with about 1 part by weight of an alkali metal at about 300* C.
Claim 5
Dependent Claim
18 words
A process according to claim 3 wherein the ammonia reaction temperature is between about 300* and 350* C.
Claim 6
Dependent Claim
19 words
A process according to claim 2 wherein the hydrocarbon is selected from the group consisting of naphthalene and anthracene.
Claim 7
Dependent Claim
54 words
A process according to claim 2 wherein the graphite-alkali metal complex is prepared by admixing graphite with a member selected from the group consisting of alkali metal benzophenone ketyls and alkali metal salts of aromatic hydrocarbons in a solvent selected from the group consisting of tetrahydrofuran, diglyme and dimethoxyethane and thereafter evaporating the solvent.
Claim 8
Dependent Claim
59 words
A catalyst for synthesizing ammonia which consisting essentially of a complex compound prepared by mixing at least one organo-alkali metal compound selected from the group consisting of alkali metal benzophenonone ketyls and alkali metal salts of aromatic hydrocarbons with graphite in a polar solvent selected from the group consisting of tetrahydrofuran, diglyme and dimethoxyethane, and thereafter evaporating the solvent.
Claim 9
Dependent Claim
19 words
The catalyst of claim 9 wherein the aromatic hydrocarbon is selected from the group consisting of naphthalene and anthracene.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |