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Energies 2017, 10(9), 1394; https://doi.org/10.3390/en10091394

Liquid vs. Gas Phase CO2 Photoreduction Process: Which Is the Effect of the Reaction Medium?

1
CatMat Lab, Department of Molecular Sciences and Nanosystems, Ca’ Foscari University Venice and Consortium INSTM, RU of Venice, Via Torino 155, 30172 Venezia, Italy
2
Chemical Plants and Industrial Chemistry Group, Department of Chemistry, Università Degli Studi di Milano, Consortium INSTM, RU of Milano Università and CNR-ISTM, via C. Golgi 19, 20133 Milan, Italy
*
Author to whom correspondence should be addressed.
Received: 2 August 2017 / Revised: 6 September 2017 / Accepted: 7 September 2017 / Published: 13 September 2017
(This article belongs to the Section Energy Sources)
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Abstract

The use of carbon dioxide, the most concerning environmental issue of the 21st century, as a feedstock for fuels productions still represents an innovative, yet challenging, task for the scientific community. CO2 photoreduction processes have the potential to transform this hazardous pollutant into important products for the energy industry (e.g., methane and methanol) employing a photocatalyst and light as the only energy input. In order to design an effective process, the high sustainability of this reaction should be matched with the perfect reaction conditions to allow the reactant, photocatalyst, and light source to come together: therefore, the choice of reaction conditions, and in particular its medium, is a crucial issue that needs to be investigated. Throughout this paper, a careful study of carbon dioxide photoreduction in liquid and vapour phases are reported, focusing on their effect on catalyst performances in terms of light harvesting, productivity, and selectivity. Different from most papers in the literature, catalytic tests were performed under extremely low light irradiance, in order to minimise the primary energy input, highlighting that this experimental variable has a great effect on the reaction pathway and, thus, product distribution. View Full-Text
Keywords: CO2 photoreduction; reaction medium; titanium dioxide; liquid phase; gas phase; product distribution CO2 photoreduction; reaction medium; titanium dioxide; liquid phase; gas phase; product distribution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Olivo, A.; Ghedini, E.; Signoretto, M.; Compagnoni, M.; Rossetti, I. Liquid vs. Gas Phase CO2 Photoreduction Process: Which Is the Effect of the Reaction Medium? Energies 2017, 10, 1394.

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