Le Forum, Vol. 41 No. 2

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Synergism of Au and Ru Nanoparticles in Low-Temperature Photoassisted CO2 Methanation

This is the peer reviewed version of the following article:Mateo-Mateo, Diego, De Masi, Deborah , Albero-Sancho, Josep, Lacroix, Lisa-Marie , Fazzini, Pier-Francesco , Chaudret, Bruno , García Gómez, Hermenegildo. (2018). Synergism of Au and Ru Nanoparticles in Low-Temperature Photoassisted CO2 Methanation.Chemistry - A European Journal, 24, 69, 18436-18443. DOI: 10.1002/chem.201803022, which has been published in final form at http://doi.org/10.1002/chem.201803022. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions[EN] Au and Ru nanoparticles have been deposited on Siralox® substrate by impregnation and chemical reduction, respectively (Au-Ru-S). The as-prepared material has demonstrated to be very active for the selective CO2 metanation to CH4 at temperatures below 250 oC. In addition, Au-Ru-S exhibits CH4 production enhancement upon UV-Vis light irradiation starting at temepratures higher than 200 oC, although the contribution of the photoassisted pathway of CH4 production decreases as temperature increases. Thus, a maximum CH4 production of 204 mmol/gRu at 250 oC upon 100 mW/cm2 irradiation was achieved. Control experiments using Ru-S and Au-S materials revealed that Ru nanoparticles are the CO2 methanation active sites, while Au NPs contribute harvesting light, mainly visible as consequence of the strong Au plasmon band centrered at 529 nm. The visible light absorbed by Au NPs plasmon could act as local heaters of neighbouring Ru NPs, increasing their temperature and enhancing CH4 production.D. M., J.A., and H.G. thank the Spanish Ministry of Economy and Competitiveness (Severo Ochoa SEV2016-0683 and CTQ2015-69563-CO2-1), Generalitat Valenciana (Prometeo 2017-083) for financial support. J.A. and D.M. also thank UPV for a postdoctoral scholarship and the Spanish Ministry of Science for a PhD Scholarship, respectively. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No GA694159 MONACAT).Mateo-Mateo, D.; De Masi, D.; Albero-Sancho, J.; Lacroix, L.; Fazzini, P.; Chaudret, B.; García Gómez, H. (2018). Synergism of Au and Ru Nanoparticles in Low-Temperature Photoassisted CO2 Methanation. Chemistry - A European Journal. 24(69):18436-18443. https://doi.org/10.1002/chem.201803022S1843618443246

Le Forum, Vol. 44 #2

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Le Forum, Vol. 42 No. 3

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Le Forum, Vol. 41 No. 4

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