Selective porphyrin-catalyzed electrochemical reduction of co2 into co in water
AssigneesCentre National de la Recherche Scientifique (CNRS), Universite Paris Diderot—Paris 7
InventorsCyrille COSTENTIN, Marc ROBERT, Jean-Michel SAVEANT, Arnaud TATIN, Iban AZCARATE
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Abstract
The present invention relates to the use of complexes of water soluble porphyrins of formula (I) below wherein R1 to R10 and R1′ to R10′ are as defined in claim 1, with iron as catalysts for the selective electrochemical reduction of CO2 into CO, electrochemical cells comprising them, and methods for reducing electrochemically CO2 into CO using said complexes, or said electrochemical cells, thereby producing CO or syngas, in water as the solvent.
Claims20
A method of reducing electrochemically CO2 into CO in water using as catalyst a complex of a porphyrin of formula (I) below:
- wherein R1 to R10 and R1′ to R10′ are independently selected from the group consisting of H, OH, F, C1-C6 alcohol, and N+(C1-C4 alkyl)3,
- and wherein:
- at least 2 and at most 8 groups among R1 to R10 and R1′ to R10′ being independently N+(C1-C4 alkyl)3, and,
- at least one of R1, R5, R1′ and R5′ is selected from the group consisting of H, F, C1-C6 alcohol, and N+(C1-C4 alkyl)3, and at least one of R6, R10, R6′ and R10′ is selected from the group consisting of H, F, C1-C6 alcohol, and
- if at least one of R1 to R5 represents N+(C1-C4 alkyl)3, then at least one of the other R1 to R5 is selected from the group consisting of H, OH or C1-C6 alcohol, and
- if at least one of R1′ to R5′ represents N+(C1-C4 alkyl)3, then at least one of the other R1′ to R5′ is selected from the group consisting of H, OH or C1-C6 alcohol, and
- if at least one of R6 to R10 represents N+(C1-C4 alkyl)3, then at least one of the other R6 to R10 is selected from the group consisting of H, OH or C1-C6 alcohol, and
- if at least one of R6′ to R10′ represents N+(C1-C4 alkyl)3, then at least one of the other R6′ to R10′ is selected from the group consisting of H, OH or C1-C6 alcohol,
- with iron in the oxidation state 0 to +III,
- and salts thereof,
- wherein CO2 is reduced into CO by the porphyrin of formula (I) with iron in the state Fe(0).
Dependencies are inferred from the claim text.