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US4661329A
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Catalyst for oxidizing an offensively smelling substance and a method of removing an offensively smelling substance
Assignee: Toyota Central R&D Labs Inc
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Filing: 1985-11-19
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Granted: 1987-04-28
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Expires: 2005-11-19
Abstract
Abstract A catalyst for decomposing an offensively smelling substance such as aldehydes by oxidation and a method which employs it for removing the offensively smelling substance. The catalyst comprises copper, cerium and silver supported on a porous ceramic carrier and is contacted with an offensively smelling substance to decompose it. The catalyst is particularly effective for decomposing aldehydes.
Inventors
- 👤 Kenichirou Suzuki
- 👤 Yoshiyasu Fujitani
- 👤 Taisuke Yoshimoto
- 👤 Hideaki Muraki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:51
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/894; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8668
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
47 words
A catalyst for oxidizing an offensively smelling substance, comprising 0.5 to 50% by weight of copper, 0.1 to 15% by weight of cerium and 0.1 to 20% by weight of silver supported on a porous ceramic carrier, said percentages being based on the weight of said carrier.
Claim 2
Dependent Claim
47 words
A catalyst for oxidizing an offensively smelling substance, comprising 0.5 to 50% by weight of copper, 0.1 to 15% by weight of cerium and 0.1 to 20% by weight of silver supported on a porous ceramic carrier, said percentages being based on the weight of said carrier.
Claim 3
Dependent Claim
35 words
The catalyst as set forth in claim 1, wherein said carrier is formed from at least one material selected from the group consisting of alumina, silica, zirconia, magnesia, zeolite, titania, cordierite, glass fiber and Kieselguhr.
Claim 4
Dependent Claim
34 words
The catalyst as set forth in claim 1, wherein said carrier supports 4 to 15% by weight of copper, 0.4 to 4% by weight of cerium and 0.5 to 10% by weight of silver.
Claim 5
Dependent Claim
15 words
The catalyst as set forth in claim 1, wherein said offensively smelling substance contains aldehydes.
Claim 6
Independent Claim
75 words
A method of removing an offensively smelling substance which comprises: (a) preparing a catalyst containing 0.5 to 50% by weight of copper, 0.1 to 15% by weight of cerium and 0.1 to 20% by weight of silver supported on a porous ceramic carrier, said percentages being based on the weight of said carrier; and (b) bringing said offensively smelling substance into contact with said catalyst in an oxidizing atmosphere to decompose said substance by oxidation.
Claim 7
Independent Claim
75 words
A method of removing an offensively smelling substance which comprises: (a) preparing a catalyst containing 0.5 to 50% by weight of copper, 0.1 to 15% by weight of cerium and 0.1 to 20% by weight of silver supported on a porous ceramic carrier, said percentages being based on the weight of said carrier; and (b) bringing said offensively smelling substance into contact with said catalyst in an oxidizing atmosphere to decompose said substance by oxidation.
Claim 8
Dependent Claim
35 words
The method as set forth in claim 5, wherein said carrier is formed from at least one material selected from the group consisting of alumina, silica, zirconia, magnesia, zeolite, titania, glass fiber, cordierite and Kieselguhr.
Claim 9
Dependent Claim
33 words
The method as set forth in claim 5, wherein said carrier supports 4 15% by weight of copper, 0.4 to 4% by weight of cerium and 0.5 to 10% by weight of silver.
Claim 10
Dependent Claim
15 words
The method as set forth in claim 5, wherein said offensively smelling substance contains aldehydes.
Claim 11
Dependent Claim
45 words
The method as set forth in claim 5, wherein said contact of said substance with said catalyst is achieved by supplying a gas containing said substance at a space velocity of 1,000 to 150,000 hr -1 and a temperature of 300° C. to 500° C.
Claim 12
Dependent Claim
26 words
The method as set forth in claim 5, wherein said contact of said substance with said catalyst is achieved in the presence of air or oxygen.
Claim 13
Dependent Claim
50 words
The method as set forth in claim 5, wherein said offensively smelling substance contains an aldehyde selected from the group consisting of formaldehyde, acetaldehyde and butyraldehyde; a cellosolve selected from the group consisting of ethyl and butyl cellosolve; and a hydrocarbon selected from the group consisting of toluene and xylene.
Claim 14
Dependent Claim
38 words
The catalyst as set forth in claim 1, wherein said copper and said cerium are in the form of copper oxide and cerium oxide, respectively, while said silver is in the form of elemental silver or silver oxide.
Claim 15
Dependent Claim
38 words
The method as set forth in claim 5, wherein said copper and said cerium are in the form of copper oxide and cerium oxide, respectively, while said silver is in the form of elemental silver or silver oxide.
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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |