Photochemical composition and use thereof for producing CH4 from CO2 and/or CO
AssigneesUniversite Paris Diderot—Paris 7, Centre National de la Recherche Scientifique (CNRS)
InventorsMarc Robert, Julien Bonin
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Abstract
The present invention relates to photochemical compositions comprising: a solution comprising an organic solvent, preferably selected from dimethylformamide, acetonitrile, and mixtures thereof with water, a sacrificial electron donor; a proton donor having a pKa in acetonitrile greater than or equal to 28; a photosensitizer whose reduced state has a standard redox potential more negative than −1.45 V vs SCE; and a metal porphyrin complex of formula (I) as defined in claim 1, useful in the production of CH4 from CO2 or CO by photochemical catalysis, to a photochemical cell comprising same and to a method for producing CH4 from CO2 or CO by photochemical catalysis using same.
Claims18
A photochemical composition for producing methane by reducing at least one of CO2 and CO at visible light, comprising:
- a solution comprising an organic solvent,
- a sacrificial electron donor;
- a proton donor having a pKa in acetonitrile greater than or equal to 28;
- a photosensitizer whose reduced state has a standard redox potential more negative than −1.45 V vs Saturated Calomel Electrode, wherein the photosensitizer is a complex of a transition metal with at least two 2-phenylpyridine (ppy) ligand;
- and
- a metal porphyrin complex of formula (I):
- wherein:
- M represents a transition metal ion,
- 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 one of R1 to R5 is OH and at least one of R1′ to R5′ is OH, or
- at least one of R1 to R5 is N+(C1-C4 alkyl)3, and at least one of R1′ to R5′ is N+(C1-C4 alkyl)3,
- and salts thereof.
Dependencies are inferred from the claim text.