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Surface probing by spectroscopy on titania-supported gold nanoparticles for a photoreductive application

Compagnoni, Matteo, Villa, Alberto, Bahdori, Elnaz, Morgan, David, Prati, Laura, Dimitratos, Nikolaos, Rossetti, Ilenia and Ramis, Gianguido 2018. Surface probing by spectroscopy on titania-supported gold nanoparticles for a photoreductive application. Catalysts 8 (12) , p. 623. 10.3390/catal8120623

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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, 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

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: MDPI
ISSN: 2073-4344
Date of First Compliant Deposit: 6 December 2018
Date of Acceptance: 29 November 2018
Last Modified: 09 Oct 2019 14:21
URI: http://orca.cf.ac.uk/id/eprint/117439

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