US3953369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a platinum catalyst used for purification of exhaust and waste gases
Assignee: Nippon Shokubai Co Ltd
•
Filing: 1974-04-02
•
Granted: 1976-04-27
•
Expires: 1994-04-02
Abstract
Abstract A method for the production of a platinum catalyst used for purification of exhaust and waste gases which comprises supporting platinum either alone or in combination of other noble metals on to a porous inorganic refractory support using an aqueous medium containing dinitrodiammineplatinum and, optionally, other noble metals or their compounds in the presence of a poly(oxyethylene) type nonionic surface active agent of an average molecular weight of at least 500 and subjecting the so treated support to activation by calcining in an oxidative atmosphere or by reducing in a reductive atmosphere.
Inventors
- 👤 Takashi Ohara
- 👤 Tetsuji Ono
- 👤 Shoichi Ichihara
- 👤 Koichi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:36
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/62; B01D53/72; B01D53/92; B01D53/94; B01D53/944; B01J; B01J23/00; B01J23/38; B01J23/40; B01J37/00; B01J37/02; B01J37/0201; B01J37/0203
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
102 words
A method for the production of a platinum catalyst used for purification of exhaust and waste gases comprising depositing platinum on to a porous inorganic refractory support by impregnating said support with an aqueous medium consisting of dinitrodiamine platinum in the presence of at least one poly (oxyethylene) type nonionic surface active agent of an average molecular weight of at least 500, selected from the group consisting of poly(oxyethylene) 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(oxyethylene)-poly(oxypropylene) block copolymers, drying the resulting impregnated support and subjecting it to calcination or reduction.
Claim 2
Independent Claim
102 words
A method for the production of a platinum catalyst used for purification of exhaust and waste gases comprising depositing platinum on to a porous inorganic refractory support by impregnating said support with an aqueous medium consisting of dinitrodiamine platinum in the presence of at least one poly (oxyethylene) type nonionic surface active agent of an average molecular weight of at least 500, selected from the group consisting of poly(oxyethylene) 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(oxyethylene)-poly(oxypropylene) block copolymers, drying the resulting impregnated support and subjecting it to calcination or reduction.
Claim 3
Dependent Claim
34 words
A method of claim 1 in which the aqueous medium containing dinitrodiamine platinum is a member selected from the group consisting of solutions of dinitrodiamine platinum in water, aqueous nitric acid and aqueous ammonia.
Claim 4
Dependent Claim
22 words
A method of claim 2 in which the aqueous medium containing dinitrodiamine platinum is an aqueous nitric acid solution of dinitrodiamine platinum.
Claim 5
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 liter of the support.
Claim 6
Dependent Claim
27 words
A method of claim 1 in which the dinitrodiamine platinum is supported in the amount as metal of 0.01 to 5 g per liter of the support.
Claim 7
Dependent Claim
27 words
A method of claim 1 in which the dinitrodiame platinum is supported in the amount as metal of 0.05 to 2 g per liter of the support.
Claim 8
Dependent Claim
51 words
The method of claim 1 in which the aqueous medium contains the dinitrodiamine platinum and another Group VIII noble metal or its compound in the form selected from the group consisting of a Group VIII noble metallic colloid, a Group VIII noble metal salt and a Group VIII noble metal acid.
Claim 9
Dependent Claim
13 words
A method of claim 7 in which the other noble metal is palladium.
Claim 10
Dependent Claim
62 words
A method of claim 4 in which the poly(oxyethylene) type nonionic surface active agent is of the general formula HO(CH.sub.2 CH.sub.2 O).sub.a (CH.sub.3 CHCH.sub.2 O).sub.b (CH.sub.2 CH.sub.2 O).sub.c H 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 11
Dependent Claim
28 words
A method of claim 4 in which the nonionic surface active agent of poly(oxyethylene) type is a polyethylene glycol of an average molecular weight of at least 1,000.
Claim 12
Dependent Claim
32 words
A method of claim 4 in which the nonionic surface active agent of poly(oxyethylene) type is a fatty acid ester of a poly(oxyethylene)sorbitan of an average molecular weight of at least 1,000.
Claim 13
Dependent Claim
29 words
A method of claim 4 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 14
Dependent Claim
28 words
A method of claim 4 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 15
Dependent Claim
23 words
A method of claim 1 in which the calcination is carried out at a temperature of 300° to 700°C in an oxidative atmosphere.
Claim 16
Dependent Claim
23 words
A method of claim 1 in which the reduction is carried out at a temperature of 150° to 600°C in a reductive atmosphere.
Claim 17
Dependent Claim
50 words
A method of claim 4 in which the nonionic surface active agent of poly(oxytheylene) type is of an average molecular weight of at least 1,000 and of the general formula ##EQU5## where, in the formula, x,x',x",x'", y,y',y" and y'" are greater than 1 and (x+x'+x"+x'"+y+y'+y"+y'") is from 20 to 800.
Claim 18
Independent Claim
117 words
A method for the production of a platinum catalyst used for purification of exhaust and waste gases comprising depositing platinum on to a porous inorganic refractory support by impregnating said support with an aqueous nitric acid solution consisting of dinitrodiamine platinum in the presence of at least one poly(oxyethylene) type nonionic surface active agent of an average molecular weight of at least 500 selected from 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(oxyethylene)-poly(oxypropylene) block copolymers in an amount of 0.1 to 50 g per liter of the support, drying the resulting impregnated support and subjecting it to calcination or reduction.
Claim 19
Independent Claim
117 words
A method for the production of a platinum catalyst used for purification of exhaust and waste gases comprising depositing platinum on to a porous inorganic refractory support by impregnating said support with an aqueous nitric acid solution consisting of dinitrodiamine platinum in the presence of at least one poly(oxyethylene) type nonionic surface active agent of an average molecular weight of at least 500 selected from 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(oxyethylene)-poly(oxypropylene) block copolymers in an amount of 0.1 to 50 g per liter of the support, drying the resulting impregnated support and subjecting it to calcination or reduction.
References Cited (Backward Citations)
US3785998A
Cited
US3816344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |