Function-Integrated Ru Catalyst for Photochemical CO2 Reduction
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Abstract
Summary
A photochemical reduction of CO2 to CO was shown using the ruthenium catalyst and sensitizer Ru(dppq)(tpy)(MeCN). Turnover numbers (TONs) up to 353 and a selectivity of 97% for CO were reached in dimethylacetamide/water. The experiments were conducted under visible-light irradiation (λ = 405 nm) with TEOA (see section SEDs below) as sacrificial electron donor.
Advances and special progress
A unprecedented rhenium complex was used as an integrated photosensitizer/catalyst to generate formic acid from CO2; other rhenium catalysts only allow for the formation of CO as the reduction product.
Additional remarks
The complex [Re(bpy)2(CO)2][OTf] can act both as a photocatalyst and sensitizer, but its performance is considerably enhanced by the addition of [Ru(bpy)3][PF6] as supplemental photosensitizer. The variation of the catalyst concentration also showed a drastic influence on the performance of the catalytic system.
Content of the published article in detail
Catalyst/Photosensitizer
Investigation
- REDIRECT Control experiments
The catalyst acts also as photosensitizer
Sacrificial electron donor
Investigations
- Concentration and solvent effect (Molecular process, Photocatalytic CO2 conversion experiments)
- Control experiments (Molecular process, Photocatalytic CO2 conversion experiments)
- Hg poisoning (Molecular process, Photocatalytic CO2 conversion experiments)
- Maximum TON (Molecular process, Photocatalytic CO2 conversion experiments)
- Presence of water effect (Molecular process, Photocatalytic CO2 conversion experiments)
