US4259209A
Expired / Lapsed
US
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Catalyst for concentrating hydrogen isotopes and process for producing a support therefor
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1979-04-30
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Granted: 1981-03-31
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Expires: 1999-04-30
Abstract
Abstract A catalyst for concentrating hydrogen isotopes for use in performing hydrogen isotopes exchange between gaseous hydrogen and liquid water, the catalyst comprising a support of porous polytetrafluoroethylene having a total specific surface area of 2 to 80 m2/g as a result of mixing therewith 0.5 to 15% by weight of fluorocarbon or a porous styrene polymer or styrene/divinylbenzene copolymer having a specific surface area of at least 150 m2/g, and deposited on the support particles of at least one element selected from Group VIII of the Periodic Table. A method for producing a support of porous polytetrafluoroethylene for such catalyst is also disclosed.
Inventors
- 👤 Ryohei Nakane
- 👤 Shohei Isomura
- 👤 Koichi Okita
- 👤 Eiji Kamijo
- 👤 Tatsuya Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:23
CPC Classifications
C; C01; C01B; C01B4/00; B; B01; B01J; B01J31/00; B01J31/02; B01J31/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
107 words
A catalyst for concentrating hydrogen isotopes for use in performing hydrogen isotope exchange between gaseous hydrogen and liquid water, said catalyst comprising a support of porous polytetrafluoroethylene having a total specific surface area of 2 to 80 m 2 /g as a result of mixing therewith 0.5 to 15% by weight of a member selected from the group consisting of fluorocarbon, a porous styrene polymer and a porous styrene/divinylbenzene copolymer having a specific surface area of at least 150 m 2 /g, and, deposited on said support, particles of at least one element selected from the group consisting of elements of Group VIII of the Periodic Table.
Claim 2
Dependent Claim
107 words
A catalyst for concentrating hydrogen isotopes for use in performing hydrogen isotope exchange between gaseous hydrogen and liquid water, said catalyst comprising a support of porous polytetrafluoroethylene having a total specific surface area of 2 to 80 m 2 /g as a result of mixing therewith 0.5 to 15% by weight of a member selected from the group consisting of fluorocarbon, a porous styrene polymer and a porous styrene/divinylbenzene copolymer having a specific surface area of at least 150 m 2 /g, and, deposited on said support, particles of at least one element selected from the group consisting of elements of Group VIII of the Periodic Table.
Claim 3
Dependent Claim
14 words
The catalyst of claim 1, wherein the fluorocarbon is the fluoride of amorphous carbon.
Claim 4
Dependent Claim
16 words
The catalyst of claim 1, wherein the porous styrene polymer or styrene/divinylbenzene copolymer is rendered hydrophobic.
Claim 5
Dependent Claim
22 words
The catalyst of claims 1, 2 or 3, wherein the porous polytetrafluoroethylene has a porosity of from about 50 to about 90%.
Claim 6
Dependent Claim
23 words
The catalyst of claims 1, 2 or 3, wherein the porous polytetrafluoroethylene is in the form of rings cut from a tube thereof.
Claim 7
Dependent Claim
25 words
The catalyst of claims 1, 2 or 3, wherein the porous polytetrafluoroethylene has an average pore diameter of from about 0.5 to about 2 microns.
Claim 8
Dependent Claim
41 words
The catalyst of claims 1 or 2, wherein the porous polytetrafluoroethylene has a fibrous structure characterized by nodes interconnected by fibrils, said fluorocarbon or said porous styrene polymer or styrene/divinylbenzene copolymer being surrounded by said fibrils, or fixed to said nodes.
Claim 9
Dependent Claim
29 words
The catalyst of claims 1, 2 or 3, wherein said at least one Group VIII element is present in an amount of about 0.01% to about 10% by weight.
Claim 10
Dependent Claim
27 words
The catalyst of claim 8, wherein said at least one Group VIII element is present in an amount of from about 0.05% to about 5% by weight.
Claim 11
Dependent Claim
21 words
The catalyst of claims 1, 2 or 3, wherein said at least one Group VIII element is Ru, Rh or Pd.
Claim 12
Dependent Claim
21 words
The catalyst of claims 1, 2 or 3, wherein said at least one Group VIII element is Os, Ir or Pt.
Claim 13
Dependent Claim
15 words
The catalyst of claim 11, wherein said at least one Group VIII element is Pt.
Claim 14
Dependent Claim
23 words
The catalyst of claim 2, wherein said fluorocarbon has a porosity of about 150 m 2 /g to about 400 m 2 /g.
Claim 15
Dependent Claim
31 words
the catalyst of claim 3, wherein said porous styrene polymer or said porous styrene/divinylbenzene polymer has a surface area of about 150 m 2 /g to about 1,000 m 2 /g.
Claim 16
Dependent Claim
18 words
The catalyst of claim 1, wherein said fluorocarbon has a fluorination degree of about 30 to about 100%.
Claim 17
Dependent Claim
130 words
The catalyst of claim 1, wherein said catalyst is prepared by extrusion-molding a mixture of a fine powder of (i) polytetrafluoroethylene, (ii) fluorocarbon or a porous styrene polymer or a porous styrene/divinylbenzene copolymer, and (iii) a liquid lubricant into a tube or rod by a paste-extrusion procedure, removing the liquid lubricant from the resulting product, stretching the resulting product at a temperature below the melting point of the polytetrafluoroethylene, heating the stretched product at a temperature above the melting point of the polytetrafluoroethylene while fixing the product so as to prevent free shrinkage, cutting the product to a suitable length to produce a catalyst support and depositing on said support particles of at least one element selected from the group consisting of elements of Group VIII of the Perioic Table.
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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |