US4003979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning air containing carbon monoxide
Assignee: Kanebo Ltd
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Filing: 1974-11-22
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Granted: 1977-01-18
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Expires: 1994-11-22
Abstract
Abstract Polluted air containing carbon monoxide can be cleaned by passing at ambient temperature the polluted air, firstly through a filter for adsorbing materials capable of reducing at ambient temperature the oxidation activity of a noble metal catalyst and then through a catalyst layer, which is composed of the noble metal catalyst supported by active carbon and contains 20 to 50% by weight of water based on the weight of total weight of the noble metal catalyst and the active carbon.
Inventors
- 👤 Hiroshi Kanno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:24
CPC Classifications
A; A62; A62D; A62D9/00; A62B; A62B21/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A method for cleaning polluted air containing oxides, nitrogen oxides, organic substances and carbon monoxide wherein the carbon monoxide is oxidized into carbon dioxide, comprising the steps of: passing the polluted air through two types of filters, one type having a layer of hopcalite or potassium permanganate deposited on active carbon for removing sulfur and nitrogen oxides and the other type being comprised of solid adsorbent selected from the group consisting of active carbon, active alumina, alumina-silica and porous particles of organic high polymers for removing organic substances and then, passing the air so treated at ambient temperature through a catalyst layer composed of a noble metal catalyst supported by the active carbon, said catalyst layer containing 20 to 50% by weight, based on the total weight of the noble metal catalyst and the active carbon, of water.
Claim 2
Independent Claim
138 words
A method for cleaning polluted air containing oxides, nitrogen oxides, organic substances and carbon monoxide wherein the carbon monoxide is oxidized into carbon dioxide, comprising the steps of: passing the polluted air through two types of filters, one type having a layer of hopcalite or potassium permanganate deposited on active carbon for removing sulfur and nitrogen oxides and the other type being comprised of solid adsorbent selected from the group consisting of active carbon, active alumina, alumina-silica and porous particles of organic high polymers for removing organic substances and then, passing the air so treated at ambient temperature through a catalyst layer composed of a noble metal catalyst supported by the active carbon, said catalyst layer containing 20 to 50% by weight, based on the total weight of the noble metal catalyst and the active carbon, of water.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein said catalyst layer contains 25 to 40% by weight, based on the total weight of the noble metal catalyst and the active carbon of water.
Claim 4
Dependent Claim
16 words
A method according to claim 1 wherein said catalyst layer is formed on a honeycomb-like structure.
Claim 5
Dependent Claim
26 words
A method according to claim 1 wherein said catalyst layer is formed on a net-like structure or a structure prepared by piling up said net-like structure.
Claim 6
Dependent Claim
31 words
A method according to claim 1 wherein said noble metal is palladium and present in an amount of 0.3 to 15% by weight based on the weight of the catalyst layer.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein said water contained in the catalyst layer is supplied by humidifying the air to be passed through the catalyst layer.
Claim 8
Dependent Claim
22 words
A method according to claim 1 wherein said water contained in the catalyst layer is supplied from a reservoir by capillary action.
Claim 9
Dependent Claim
24 words
A method according to claim 1 wherein said water contained in the catalyst layer is supplied by spraying the water over the catalyst layer.
References Cited (Backward Citations)
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US3088919A
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US3370914A
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US3443886A
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US3429656A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |