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Keywords = protoreactor

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16 pages, 6542 KB  
Article
Surface Probing by Spectroscopy on Titania-Supported Gold Nanoparticles for a Photoreductive Application
by Matteo Compagnoni, Alberto Villa, Elnaz Bahdori, David J. Morgan, Laura Prati, Nikolaos Dimitratos, Ilenia Rossetti and Gianguido Ramis
Catalysts 2018, 8(12), 623; https://doi.org/10.3390/catal8120623 - 5 Dec 2018
Cited by 16 | Viewed by 4739
Abstract
The continuous increase in scientific reports concerning photocatalysis and in particular CO2 photoreduction in recent years reveals the high degree of interest around the topic. However, the adsorption and activation mechanisms of CO2 on TiO2, the most used photocatalyst, [...] Read more.
The continuous increase in scientific reports concerning photocatalysis and in particular CO2 photoreduction in recent years reveals the high degree of interest around the topic. However, the adsorption and activation mechanisms of CO2 on TiO2, the most used photocatalyst, are poorly understood and investigated. Gold nanoparticles were prepared by a modified deposition-precipitation method using urea and a chemical reductant. Bare P25 was used as reference. Combined spectroscopic investigations of fresh and spent samples with photoactivity studies reported in this article provide new insights to the role of CO2 adsorption and carbonate formation on Au/TiO2 during CO2 photocatalytic reduction. The key intermediates’ and products’ adsorption (CO, methanol, ethanol) was studied, coupled with X-ray photoelectron microscopy (XPS) and UV-Visible spectroscopy. The adsorption of CO2 on fresh and spent catalysts changes radically considering the carbonate formation and the gold surface presence. Methanol and ethanol revealed new adsorbed species on Au with respect to bare titania. The characterisation of the spent catalysts revealed the good stability of these samples. Full article
(This article belongs to the Special Issue Metal Catalysts for Renewable Energies)
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