Patent US4451342A successfully refreshed from Google Patents.
US4451342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light driven photocatalytic process
Assignee: KALAMBELLA M VIJAYAKUMAR
•
Filing: 1982-05-03
•
Granted: 1984-05-29
•
Expires: 2002-05-03
Abstract
Abstract A method for the light driven photocatalytic reduction of carbon dioxide or the bicarbonate ion to one or more compounds which comprises contacting certain metal compounds with the carbon dioxide and/or bicarbonate ion in the absence of separate physical electrolyte and electrodes, and conducting said contacting in the presence of a reducing agent such as water and light.
Inventors
- 👤 Norman N. Lichtin
- 👤 Kalambella M. Vijayakumar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:59
CPC Classifications
C; C07; C07C; C07C45/00; B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/127; C01; C01B; C01B32/00; C01B32/40; C07C29/00; C07C29/15; C07C51/00; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S204/00; Y10S204/902; Y10S204/903; Y10S204/904; Y10S204/905
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
A method for the light driven photocatalytic reduction of carbon dioxide or the bicarbonate ion to at least one compound which comprises contacting at least one metal compound catalyst selected from the group consisting of of CoO, Co 3 O 4 , Co 2 O 3 , Cr 2 O 3 , Cu 2 O, CuO, La-Ni-oxide, platinized La-Ni-oxide, La 2 O 3 , Nd 2 O 3 , NiO, PbO, and mixtures and combinations thereof with at least one of carbon dioxide and the bicarbonate ion in the presence of a reducing agent and in the absence of other carbon sources and separate physical electrolyte and electrodes, and conducting said contacting in the presence of light so that the energy of reduction is essentially supplied by said light.
Claim 2
Independent Claim
129 words
A method for the light driven photocatalytic reduction of carbon dioxide or the bicarbonate ion to at least one compound which comprises contacting at least one metal compound catalyst selected from the group consisting of of CoO, Co 3 O 4 , Co 2 O 3 , Cr 2 O 3 , Cu 2 O, CuO, La-Ni-oxide, platinized La-Ni-oxide, La 2 O 3 , Nd 2 O 3 , NiO, PbO, and mixtures and combinations thereof with at least one of carbon dioxide and the bicarbonate ion in the presence of a reducing agent and in the absence of other carbon sources and separate physical electrolyte and electrodes, and conducting said contacting in the presence of light so that the energy of reduction is essentially supplied by said light.
Claim 3
Dependent Claim
19 words
The method according to claim 1 wherein said light is one of artificial light, sunlight, or a combination thereof.
Claim 4
Dependent Claim
18 words
The method according to claim 1 wherein said compounds are carbon monoxide, methanol, formaldehyde, methane, and formic acid.
Claim 5
Dependent Claim
15 words
The method according to claim 1 wherein said reducing agent is an aqueous carrier liquid.
Claim 6
Dependent Claim
32 words
The method according to claim 4 wherein said metal compound is dispersed in said carrier liquid and said carbon dioxide and/or bicarbonate ion is carried to said metal compound by said liquid.
Claim 7
Dependent Claim
12 words
The method according to claim 1 wherein said reducing agent is water.
Claim 8
Dependent Claim
14 words
The method according to claim 1 wherein said metal compound is in subdivided form.
Claim 9
Dependent Claim
15 words
The method according to claim 7 wherein said metal compound is subdivided into powder form.
Claim 10
Dependent Claim
49 words
The method according to claim 1 wherein said metal compound is heat treated prior to contact with carbon dioxide or the bicarbonate ion by heating at a temperature of from about 20° C. to about 600° C. for at least one hour in air, argon, hydrogen or a vacuum.
Claim 11
Dependent Claim
22 words
The method according to claim 9 wherein said heat treatment is for from about one hour to about forty-eight hours in air.
Claim 12
Dependent Claim
23 words
The method according to claim 9 wherein said heat treatment is for from about one hour to about forty-eight hours in a vacuum.
Claim 13
Dependent Claim
24 words
The method according to claim 9 wherein said heat treatment is for from about one hour to about forty-eight hours in argon or hydrogen.
Claim 14
Dependent Claim
27 words
The method according to claim 1 wherein said light has a wavelength range such that at least part of said light is absorbed by said metal compound.
Claim 15
Dependent Claim
35 words
The method according to claim 1 wherein said at least one compound is selected from the group consisting of carbon monoxide, alcohols, aldehydes, hydrocarbons, and carboxylic acids having 1 to 2 carbon atoms per molecule.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |