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US 2026/0028299 A1Published application
Method for catalytically reducing carbon dioxide
AssigneeKing Fahd University of Petroleum and Minerals
InventorsAbdullah Salem Mohammed BAFAQEER, Aniz Chennampilly UMMER
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Abstract
A method of reducing carbon dioxide (CO2) including contacting a catalyst and the CO2 and irradiating the catalyst and the CO2 with visible light. Upon irradiating the CO2 is reduced to a conversion product. The catalyst includes Fe2TiO5 in the form of nanosheets. The nanosheets have an average width of 200 nanometers (nm) to 800 nm and form a hierarchical structure.
Claims18
1:
- A method for catalytically reducing carbon dioxide, comprising:
- contacting a catalyst and the carbon dioxide in a fixed bed reactor containing the catalyst in powder form;
- and
- irradiating the catalyst and the carbon dioxide with visible light,
- wherein on the irradiating the carbon dioxide is reduced to a conversion product,
- wherein the catalyst comprises Fe2TiO5,
- wherein particles of the Fe2TiO5 are in a form of nanosheets,
- wherein the nanosheets have an average width of 200-800 nm, and
- wherein the nanosheets form a hierarchical structure of two or more of the nanosheets stacked on top of one another.
6 more elements
2:
- The method of claim 1, wherein the nanosheets are crystalline.
3:
- The method of claim 1, wherein the nanosheets have an interplanar distance of 0.3-0.4 nanometers (nm).
4:
- The method of claim 1, wherein the nanosheets have an average length of 1-3 micrometers (μm).
5:
- The method of claim 1, wherein the catalyst comprises 45-55 wt. % Fe, 25-35 wt. % O, and 15-25 wt. % Ti, based on a total weight of the catalyst.
6:
- The method of claim 1, wherein the catalyst absorbs light from 200-550 nm.
7:
- The method of claim 1, wherein the catalyst has a peak light absorbance from 375-425 nm.
8:
- The method of claim 1, wherein the catalyst has a band gap of 1.9-2.2 electron volts (eV).
9:
- The method of claim 1, wherein the catalyst does not comprise Fe2O3 or TiO2.
10:
- The method of claim 1, wherein the carbon dioxide is in a gaseous state.
(canceled)
12:
- The method of claim 1, wherein the conversion product is at least one selected from the group consisting of methanol and dimethyl ether.
13:
- The method of claim 1, wherein the irradiating is for 1 min to 10 hours.
14:
- The method of claim 1, wherein the visible light has a wavelength of 400-700 nm, and a power of 10-100 watts (W).
15:
- The method of claim 1, wherein the conversion product is methanol, and a yield of the methanol is 120-160 μmol per gram of the catalyst after irradiating for 4 hours.
16:
- The method of claim 1, wherein the conversion product is dimethyl ether, and a yield of the dimethyl ether of 40-60 micromoles per gram (μmol) of the catalyst after irradiating for 4 hours.
17:
- The method of claim 1, wherein the catalyst has a higher conversion to the conversion product than TiO2 under the same conditions.
18:
- The method of claim 1, wherein the Fe2TiO5 is made by a method comprising:
- mixing an iron salt in a solvent to form a first mixture;
- adding titanium isopropoxide to the first mixture to form a second mixture;
- heating the second mixture in an autoclave at a temperature of 150-200° C. for 1-24 hours to form a suspension;
- separating a precipitate from the suspension;
- and
- calcining the precipitate at a temperature of 400-800° C. for 1-24 hours to form the catalyst.
4 more elements
Dependencies are inferred from the claim text.