US4684537A
Expired / Lapsed
US
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Process for the sensitization of an oxidation/reduction photocatalyst, and photocatalyst thus obtained
Assignee: R E Stiftung
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Filing: 1985-04-30
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Granted: 1987-08-04
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Expires: 2005-04-30
Abstract
Abstract A photocatalyst for photodecomposition of liquids is sensitized to visible light by chemically bonding to the catalyst a complex of a transition metal with a bipyridyl or phenanthrolyl type ligand.
Inventors
- 👤 Michael Graetzel
- 👤 Nick Serpone
- 👤 Dung Duonghong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/462; C01; C01B; C01B3/00; C01B3/02; C01B3/04; C01B3/042; C01B3/046; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/029; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36; Y02P; Y02P20/00; Y02P20/10; Y02P20/133
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A process for the sensitization of a titanium oxide-based oxidation/reduction photocatalyst, which comprises chemically bonding to its surface a chromophore consisting of a fragment of a complex of a transition metal with a ligand of the bipyridyl or phenanthrolyl type, causing the light absorption band of the catalyst to shift into the visible region.
Claim 2
Dependent Claim
54 words
A process for the sensitization of a titanium oxide-based oxidation/reduction photocatalyst, which comprises chemically bonding to its surface a chromophore consisting of a fragment of a complex of a transition metal with a ligand of the bipyridyl or phenanthrolyl type, causing the light absorption band of the catalyst to shift into the visible region.
Claim 3
Dependent Claim
21 words
The process as claimed in claim 1, wherein the chromophore consists of a fragment of a ruthenium, chromium or iron complex.
Claim 4
Dependent Claim
34 words
The process as claimed in one of claims 1 or 2 wherein the said chromophore consists of a complex fragment of the formula: RuL.sub.2.sup.++ in which the symbol L represents the ligand diisopropyl 2,2'-bipyridyl-4,4'dicarboxylate.
Claim 5
Dependent Claim
44 words
The process as claimed in claim 3, wherein the photocatalyst is irradiated in the presence of an acid aqueous solution of a complex of the formula: (RuL.sub.3).sup.++ 2X.sup.- in which the symbol L is defined in claim 6 and X represents a halogen atom.
Claim 6
Dependent Claim
41 words
The process as claimed in claim 4, wherein irradiation is carried out at a temperature of between 50° C. and the boiling point of the solution of complex and wherein the said solution has a pH of between 1 and 3.
Claim 7
Dependent Claim
53 words
A process for the sensitization of a semiconductor-based oxidation/reduction photocatalyst, which comprises chemically bonding to its surface a chromophore consisting of a fragment of a complex of a transition metal with a ligand of the bipyridyl or phenanthrolyl type, causing the light absorption band of the catalyst to shift into the visible region.
Claim 8
Dependent Claim
53 words
A process for the sensitization of a semiconductor-based oxidation/reduction photocatalyst, which comprises chemically bonding to its surface a chromophore consisting of a fragment of a complex of a transition metal with a ligand of the bipyridyl or phenanthrolyl type, causing the light absorption band of the catalyst to shift into the visible region.
Claim 9
Dependent Claim
54 words
A process for the sensitization of a titanium oxide-based oxidation/reduction photocatalyst which comprises chemically bonding to its surface a chromophore consisting of a fragment selected from the group consisting of ruthium, chromium and iron complexes with the ligand diisopropyl 2,2'-bipyridyl-4,4'-dicarboxylate, causing the light absorption band of the catalyst to shift into the visible region.
Claim 10
Dependent Claim
54 words
A process for the sensitization of a titanium oxide-based oxidation/reduction photocatalyst which comprises chemically bonding to its surface a chromophore consisting of a fragment selected from the group consisting of ruthium, chromium and iron complexes with the ligand diisopropyl 2,2'-bipyridyl-4,4'-dicarboxylate, causing the light absorption band of the catalyst to shift into the visible region.
Claim 11
Dependent Claim
31 words
The process as claimed in claim 4 wherein said chromophore is the product of a reaction involving the loss of at least one ligand from said complex of the formula: RuL.sub.3.sup.++
References Cited (Backward Citations)
US4105517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |