Iron-based catalyst for selective electrochemical reduction of CO
View Patent ↗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.
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.