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Patent US3897368A successfully refreshed from Google Patents.
US3897368A
Expired / Lapsed
US
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Method for the production of noble metal catalysts
Assignee: Nippon Shokubai Co Ltd
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Filing: 1973-11-29
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Granted: 1975-07-29
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Expires: 1993-11-29
Abstract
Abstract Noble metal catalysts are prepared by supporting a noble metal onto a refractory porous inorganic support from an aqueous medium containing a noble metal or a compound thereof in the presence of a nonionic surface active agent of poly(oxyethylene) type having an average molecular weight of at least 500 and subjecting the so treated support to activation.
Inventors
- 👤 Takashi Ohara
- 👤 Shoichi Ichihara
- 👤 Koichi Saito
- 👤 Tetsuji Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:53
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J37/00; B01J37/02; B01J37/0201; B01J37/0203
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
IN THE PRODUCTION OF NOBLE METAL CATALYSTS IN WHICH A NOBLE METAL IS SUPPORTED ONTO A REFRACTIONORY POROUS INORGANIC SUPPORT FROM AN AQUEOUS MEDIUM CONTAINING A NIBLE METAL OR COMPOUND THEREOF, THE IMPROVEMENT COMPRISING A. DEPOSITING A HIGH CONCENTRATION OF SAID NOBLE METAL ON THE SURFACE OF A REFRACTORY POROUS SUPPORT HAVING AN AVERAGE PARTICLE DIAMETER OF 1.5 TO 15 MM. BY IMPREGNATING SAID SUPPORT WITH AN AQUEOUS SOLUTION OR DISPERSION OF SAID NOBLE METAL OR A COMPOUND THEREOF IN THE PRESENCE OF A NONIONIC SURFACE ACTIVE AGENT OF THE POLY (OXYETHLENE) TYPE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 500, AND B. SUBJECTING THE RESULT SUPPORTED CATLYST TO ACTIVATION.
Claim 2
Dependent Claim
111 words
IN THE PRODUCTION OF NOBLE METAL CATALYSTS IN WHICH A NOBLE METAL IS SUPPORTED ONTO A REFRACTIONORY POROUS INORGANIC SUPPORT FROM AN AQUEOUS MEDIUM CONTAINING A NIBLE METAL OR COMPOUND THEREOF, THE IMPROVEMENT COMPRISING A. DEPOSITING A HIGH CONCENTRATION OF SAID NOBLE METAL ON THE SURFACE OF A REFRACTORY POROUS SUPPORT HAVING AN AVERAGE PARTICLE DIAMETER OF 1.5 TO 15 MM. BY IMPREGNATING SAID SUPPORT WITH AN AQUEOUS SOLUTION OR DISPERSION OF SAID NOBLE METAL OR A COMPOUND THEREOF IN THE PRESENCE OF A NONIONIC SURFACE ACTIVE AGENT OF THE POLY (OXYETHLENE) TYPE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 500, AND B. SUBJECTING THE RESULT SUPPORTED CATLYST TO ACTIVATION.
Claim 3
Dependent Claim
49 words
A method of claim 1 in which the nonionic surface active agent of poly(oxyethylene) type is at least one member of the group consisting of polyethylene glycols, poly(oxyethylene) alkyl ethers, poly(oxyethylene) alkylaryl ethers, poly(oxyethylene) alkyl esters, poly(oxyetHylene) alkylamines, poly(oxyethylene) alkylamides, fatty acid esters of poly(oxyethylene)sorbitanes and poly(oxethylene)-poly(oxypropylene) block copolymers.
Claim 4
Dependent Claim
27 words
A method of claim 1 in which the nonionic surface active agent is used in the amount of 0.1 to 50 g per litre of the support.
Claim 5
Dependent Claim
30 words
A method of claim 1 in which the nonionic surface active agent of poly(oxyethylene) type is used in the amount of 0.2 to 20 g per litre of the support.
Claim 6
Dependent Claim
27 words
A method of claim 1 in which the noble metal is supported in the amount as metal of 0.01 to 5 g per litre of the support.
Claim 7
Dependent Claim
27 words
A method of claim 1 in which the noble metal is supported in the amount as metal of 0.05 to 2 g per litre of the support.
Claim 8
Dependent Claim
54 words
A method of claim 3 in which the nonionic surface active agent of poly(oxyethylene) type is of the general formula HO(CH2CH2O)a(CH3CHCH2O)b(CH2CH2O)cH where, in the formula, a, b and c are greater than 1 and (a + b + c) is from 20 to 400, and of an average molecular weight of at least 1,000.
Claim 9
Dependent Claim
30 words
A method of claim 3 in which the nonionic surface active agent of poly(oxyethylene) type is of an average molecular weight of at lease 1,000 and of the general formula
Claim 10
Dependent Claim
27 words
A method of claim 3 in which the nonionic surface active agent of poly(oxyethylene) type is a polyethylene glycol of an average molecular weightof at least 1,000.
Claim 11
Dependent Claim
32 words
A method of claim 3 in which the nonionic surface active agent of poly(oxyethylene) type is a fatty acid ester of a poly(oxyethylene)sorbitane of an average molecular weight of at least 1,000.
Claim 12
Dependent Claim
29 words
A method of claim 3 in which the nonionic surface active agent of poly(oxyethylene) type is a poly(oxyethylene) alkyl ether of an average molecular weight of at least 500.
Claim 13
Dependent Claim
28 words
A method of claim 3 in which the nonionic surface active agent of poly(oxyethylene) type is a poly(oxyethylene) alkylaryl ether of average molecular weight of at least 1,000.
Claim 14
Dependent Claim
29 words
A method of claim 1 in which the activation is carried out by calcination of the treated support at a temperature of 300* to 700*C in an oxidative atmosphere.
Claim 15
Dependent Claim
29 words
A method of claim 1 in which the activation is carried out by reduction of the treated support at a temperature of 150* to 600*C in a reductive atmosphere.
Claim 16
Dependent Claim
27 words
A method of claim 5 in which the noble metal is at least one member selected from the group consisting of platinum, palladium, iridium, rhodium and ruthenium.
Claim 17
Dependent Claim
24 words
A method of claim 5 in which the noble metal is at least one member selected from the group consisting of platinum and palladium.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |