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The use of carbon monoxide as a probe molecule in spectroscopic studies for determination of exposed gold sites on TiO2

Lari, Giacomo M., Nowicka, Ewa, Morgan, David John, Kondrat, Simon A. and Hutchings, Graham John 2015. The use of carbon monoxide as a probe molecule in spectroscopic studies for determination of exposed gold sites on TiO2. Physical Chemistry Chemical Physics 17 (35) , pp. 23236-23244. 10.1039/C5CP02512E

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Abstract

The sol immobilisation technique, in which a stabilising ligand (such as polyvinyl alcohol or polyvinyl pyridine) can be used to tune metal particle size and composition, has become a valuable method of making supported nanoparticle catalysts. An unfortunate consequence of the stabilising ligand is that often access of reactant molecules to the metal nanoparticle surface is impeded. Several methods have been proposed for the removal of these ligands, though determination of the degree of their success is difficult. Here, we demonstrate the use of in situ infrared and UV-Vis spectroscopy to elucidate the access of carbon monoxide to the surface of Au/TiO2 catalysts before and after various ligand removal treatments. These were contrasted with a catalyst prepared by deposition precipitation prepared in the absence of stabilising ligand as a control. Changes were observed in the infrared spectrum, with the wavenumber of carbon monoxide linearly bonded to Au for catalysts shifting before and after ligand removal, which correlated well with the activity of the catalyst for carbon monoxide oxidation. Also the extent of shifting of the Au surface resonance plasmon band on the addition of carbon monoxide, observed by UV-Vis, also correlated well with catalyst activity. These simple methods can be used to determine the quantity of exposed metal sites after a ligand removal treatment and so determine the treatments effectiveness.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1463-9076
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 5 August 2015
Last Modified: 22 Jun 2019 22:12
URI: http://orca-mwe.cf.ac.uk/id/eprint/87746

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