Iron-based catalyst for selective electrochemical reduction of CO2 into CO

Patent metadata

Field	Value
Publication number	US-9447511-B2
Application number	US-201314046472-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Oct 4, 2013
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

The present invention relates to catalysts for the production of CO gas through electrochemical CO 2 reduction. In particular, the present invention relates to an electrochemical cell comprising an iron porphyrin as the catalyst for the CO 2 reduction into CO, a method of performing electrochemical reduction of CO 2 using said electrochemical cell thereby producing CO gas, and a method of performing electrochemical reduction of CO 2 using said iron porphyrin catalyst thereby producing CO gas.

First claim

The invention claimed is:

1. Method comprising performing electrochemical reduction of CO 2 thereby producing CO gas, using the porphyrin of formula (I):

wherein
R1 represents OH, or C 1 -C 4 -alcohol,
R2, R3, R4, R5, R6 and R7 independently represent H, OH, or C 1 -C 4 -alcohol, and
Fe represents either Fe(0), Fe(I), Fe(II) or Fe(III);
as a catalyst in an electrochemical cell for said electrochemical reduction of CO 2 into CO.

2. The method of claim 1 , wherein the potential applied to the cathode is between −2.5 and −0.5 V versus NHE.

3. The method of claim 1 , wherein the intensity applied to the cathode is between 2.0 and 5.0 A/m 2 .

4. The method of claim 1 , wherein R1 represents OH.

5. The method of claim 1 , wherein R2 represents OH.

6. The method of claim 1 , wherein R1, R2 and R3 represents OH.

7. The method of claim 1 , wherein said porphyrin is

8. The method of claim 1 , wherein the CO 2 is being reduced by the porphyrin of formula (I) with iron transition metal in the state Fe(0).

9. The method of claim 1 , wherein the electrochemical reduction of CO 2 into CO is carried out at 1 bar of CO 2 .

10. The method of claim 1 , wherein the faradic yield in CO is of between 84% and 99%.

11. The method of claim 1 , wherein no formation of formic acid or formate is observed.

Assignees

• Centre Nat De La Rech Scient (Cnrs)
• Univ Paris Diderot Paris 7

Inventors

• Costentin Cyrille
• Robert Marc
• Saveant Jean-Michel
• Drouet Samuel

Classifications

• C25B1/23

  Carbon monoxide or syngas · CPC title

• C25B9/17 Primary

  Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof · CPC title

• C25B1/00

  Electrolytic production of inorganic compounds or non-metals · CPC title

• C25B9/06 Primary

  Chemistry & Metallurgy · mapped topic