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Visible-Light-Driven Conversion of CO2 to CH4 with an Organic Sensitizer and an Iron Porphyrin Catalyst

Open access
Rao, Heng, Lim, Chern-Hooi, Bonin, Julien, Miyake, Garret M., Robert, Marc·2018·Journal of the American Chemical Society

Abstract

Using a phenoxazine-based organic photosensitizer and an iron porphyrin molecular catalyst, we demonstrated photochemical reduction of CO 2 to CO and CH 4 with turnover numbers (TONs) of 149 and 29, respectively, under visible-light irradiation (λ > 435 nm) with a tertiary amine as sacrificial electron donor. This work is the first example of a molecular system using an earth-abundant metal catalyst and an organic dye to effect complete 8e – /8H + reduction of CO 2 to CH 4, as opposed to typical 2e – /2H + products of CO or formic acid. The catalytic system continuously produced methane even after prolonged irradiation up to 4 days. Using CO as the feedstock, the same reactive system was able to produce CH 4 with 85% selectivity, 80 TON and a quantum yield of 0.47%. The redox properties of the organic photosensitizer and acidity of the proton source were shown to play a key role in driving the 8e – /8H + processes.

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Metadata

Authors
Rao, H., Lim, C.-H., Bonin, J., Miyake, G. M., & Robert, M.
Venue
Journal of the American Chemical Society
Published
2018-12-07
Volume
140
Issue
51
Pages
17830-17834
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2904893302
Cited by
225
References
3
FWCI
4.41
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Visible-Light-Driven Conversion of CO2 to CH4 with an Organic Sensitizer and an Iron Porphyrin Catalyst. https://app.cochat.ai/papers/10.1021/jacs.8b09740
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Rao, H., Lim, C.-H., Bonin, J., Miyake, G. M., & Robert, M. (2018). Visible-Light-Driven Conversion of CO2 to CH4 with an Organic Sensitizer and an Iron Porphyrin Catalyst. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.8b09740

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