US4073873A
Expired / Lapsed
US
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Catalytic decomposition of hypochlorite
Assignee: Dow Chemical Co
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Filing: 1976-03-29
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Granted: 1978-02-14
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Expires: 1996-03-29
Abstract
Abstract Hypochlorite ions in aqueous solution are catalytically decomposed by the action of a single-metal spinel of Co 3 O 4 , preferably coated on an inert, stable support. The Co 3 O 4 catalyst may contain dispersed therein, optionally, other "modifier" metal oxides which do not affect the single-metal spinel structure of the Co 3 O 4 , but which contribute better adherence of the Co 3 O 4 to the substrate and improve the toughness of the Co 3 O 4 coating.
Inventors
- 👤 Donald L. Caldwell
- 👤 Raymond J. Fuchs, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:26
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0203; B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/75; B01J23/76; C01D; C01D3/00; C01D3/04; C01D3/06; C02; C02F; C02F1/00; C02F1/72; C02F1/76
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
In a process of catalytically decomposing hypochlorites into oxygen and chloride, wherein said hypochlorites are of the group consisting of hypochlorous acid and metal salts of hypochlorous acid, and are in aqueous solution at a pH of not less than about 5.0 said process comprising contacting the hypochlorites with an oxide of cobalt as the catalyst, the improvement which comprises using single-metal spinel Co 3 O 4 as the catalyst.
Claim 2
Dependent Claim
70 words
In a process of catalytically decomposing hypochlorites into oxygen and chloride, wherein said hypochlorites are of the group consisting of hypochlorous acid and metal salts of hypochlorous acid, and are in aqueous solution at a pH of not less than about 5.0 said process comprising contacting the hypochlorites with an oxide of cobalt as the catalyst, the improvement which comprises using single-metal spinel Co 3 O 4 as the catalyst.
Claim 3
Dependent Claim
36 words
The improved process of claim 1 wherein the Co 3 O 4 catalyst is supported by a substrate selected from the group consisting of noble metals, valve metals, transition metals, mineral fibers, asbestos, graphite, and refractories.
Claim 4
Dependent Claim
25 words
The process of claim 2 wherein the substrate is at least one of the group consisting of aluminum silicate, alumina, chemical stoneware, or titanium sponge.
Claim 5
Dependent Claim
148 words
In a process of catalytically decomposing hypochlorites into oxygen and chloride, wherein said hypochlorites are of the group consisting of hypochlorous acid and metal salts of hypochlorous acid and are in aqueous solution at a pH of not less than about 5.0, said process comprising contacting the hypochlorites with an oxide of cobalt as the catalyst, the improvement which comprises using single-metal spinel Co 3 O 4 as the catalyst, wherein the Co 3 O 4 contains dispersed therein a modifier oxide which is substantially inert with respect to the aqueous solution, said modifier oxide being at least one oxide of the metals of Groups III-A, III-B, IV-A, IV-B, V-B, VI-B, VII-B, Lanthanides, and Actinides of the Periodic Table of the Elements, said modifier oxide being present in an amount not more than 50 mole percent, as the metal, of the total Co 3 O 4 /modifier oxide.
Claim 6
Dependent Claim
148 words
In a process of catalytically decomposing hypochlorites into oxygen and chloride, wherein said hypochlorites are of the group consisting of hypochlorous acid and metal salts of hypochlorous acid and are in aqueous solution at a pH of not less than about 5.0, said process comprising contacting the hypochlorites with an oxide of cobalt as the catalyst, the improvement which comprises using single-metal spinel Co 3 O 4 as the catalyst, wherein the Co 3 O 4 contains dispersed therein a modifier oxide which is substantially inert with respect to the aqueous solution, said modifier oxide being at least one oxide of the metals of Groups III-A, III-B, IV-A, IV-B, V-B, VI-B, VII-B, Lanthanides, and Actinides of the Periodic Table of the Elements, said modifier oxide being present in an amount not more than 50 mole percent, as the metal, of the total Co 3 O 4 /modifier oxide.
Claim 7
Dependent Claim
35 words
The process of claim 4 wherein the Co 3 O 4 catalyst is supported by a substrate selected from the group consisting of noble metals, valve metals, transition metals, mineral fibers, asbestos, graphite, and refractories.
Claim 8
Dependent Claim
35 words
The process of claim 4 wherein the modifier metal oxide is an oxide of at least one of the metals selected from the group consisting of zirconium, lead, vanadium, tantalum, niobium, molybdenum, cerium and titanium.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein the hypochlorite in aqueous solution is present as dissolved hypochlorous acid.
Claim 10
Dependent Claim
18 words
The process of claim 1 wherein the hypochlorite in aqueous solution is present as dissolved alkali metal hypochlorite.
Claim 11
Dependent Claim
12 words
The process of claim 8 wherein the alkali metal hypochlorite is NaOCl.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |