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Photoredox system with biocatalyst for CO2 utilization

Abstract

Various researches on visible-light driven redox systems for hydrogen production, CO2 reduction and utilization are paid much attention to the solar fuel and chemical production. In general, the visible-light driven redox system is consisted of an electron donor, a photocatalytic dye, an electron mediator and a catalyst. One of the important component in the visible-light driven redox system is effective catalyst for hydrogen production, CO2 reduction and utilization. The catalyst used in the visible-light driven redox system is classified into metal nanoparticles, molecular catalyst and biocatalyst. Among these catalysts, the biocatalyst is one of promising catalyst because it has excellent selectivity of the reaction and substrate. For CO2 reduction and utilization, especially, the highly reaction selectivity of the biocatalyst is remarkable in comparison with other various catalysts. Among biocatalysts for CO2 reduction and utilization, NAD(P)+-dependent dehydrogenases that are commercially available are widely used for the visible-light driven redox system of CO2 reduction. Formate dehydrogenase (FDH) from Candida boidinii is typical NAD(P)+-dependent dehydrogenase for the visible-light driven redox of CO2 reduction to formate. Furthermore, by adding commercially available aldehyde (aldDH), formaldehyde (FldDH) and alcohol dehydrogenase (ADH) to this system, CO2 is reduced to methanol via the formate and formaldehyde as the intermediators in the visible-light driven redox system. Among biocatalysts for CO2 reduction and utilization, in contrast, NAD(P)+-dependent dehydrogenases with the function of decarboxylating that also are commercially available are widely used for the visible-light driven building carbon-carbon bond from CO2 and organic molecule. Malic enzyme (ME) from Chicken liver is typical NAD(P)+-dependent dehydrogenase with decarboxylating for the visible-light driven malate production based on the building carbon-carbon bond from CO2 and pyruvate. In this review, the visible-light driven CO2 reduction and utilization systems consisted of photoreduction of NAD(P)+ and biocatalysts are introduced. Furthermore, the visible-light driven CO2 reduction and utilization systems consisted of photoreduction of bipyridinium salt (viologen)-based electron mediator and biocatalysts also are introduced. In particular, by utilizing the viologen-based electron mediator, the simplification of the visible-light driven CO2 reduction and utilization systems and the improvement of efficiency without changing the structure of the biocatalyst also are mentioned.

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Publication details

The article was received on 06 May 2018, accepted on 14 Jun 2018 and first published on 14 Jun 2018


Article type: Review Article
DOI: 10.1039/C8SE00209F
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Photoredox system with biocatalyst for CO2 utilization

    Y. Amao, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00209F

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