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This is an author version of the contribution published on:Sol immobilization is a widely used method to prepare gold catalysts. The presence of the protective layer can have a significant influence on catalyst properties by mediating metal-support and reactantmetal interactions. This paper details the effect of a polyvinyl alcohol (PVA) protecting groups on the activity of a supported gold catalysts as well as its selectivity towards glycerol oxidation.

Supported gold nanoparticles are very effective catalysts for the selective oxidation of glycerol which represents an important bio-derived feedstock. In this paper we report that the acid/base properties, especially the acid site density, of these catalysts are the key factor in tuning the selectivity. A range of supported AuPt catalysts have been prepared by sol immobilization using acidic (H-mordenite, SiO 2 , MCM-41, and sulfated ZrO 2 ) and basic (NiO and MgO) oxides as supports. In particular, using MCM-41 as the support, a high selectivity to glyceraldehyde, an important labile intermediate, was found.Catal. Sci. Technol. This journal is

Defects (O vacancies) with different Raman properties (A–C, see graphic) and reactivity are present on Au/CeO2. A is Raman inactive, located in external layers, able to form O22− species with O2; B, formed by a Au‐catalysed reduction in H2, is Raman active, located in non‐stoichiometric surface layer, and reacts with O2 without forming O22− species; C is Raman active, located in inner positions, and gives negligible reactivity upon O2. Only A and B defects react with H2O.

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