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Catalysts 2016, 6(6), 87; doi:10.3390/catal6060087

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

1
Department of Molecular Sciences and Nanosystems, Ca’ Foscari University Venice and INSTM-RU Ve, Via Torino 155, Venezia Mestre 30170, Italy
2
Physics and Geology Department, University of Perugia, Via Pascoli, Perugia 06123, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Leonarda F. Liotta and Salvatore Scirè
Received: 15 March 2016 / Revised: 17 May 2016 / Accepted: 6 June 2016 / Published: 20 June 2016
(This article belongs to the Collection Gold Catalysts)
View Full-Text   |   Download PDF [7168 KB, uploaded 20 June 2016]   |  

Abstract

New gold catalysts supported on CeO2, ZrO2 and TiO2 were synthesized by two different techniques: deposition-precipitation and colloidal method. The role of the surfactant (PVA, PVP, THPC) was also investigated. The catalysts were tested in the oxidation of glucose to gluconic acid, in aqueous environment and under mild conditions (60 °C and atmospheric pressure). TEM and SEM analyses have shown that the small size of gold nanoparticles is a necessary condition, but not sufficient for a good conversion. In fact, for an active sample, we have verified that the excess of surfactant must be removed because it would coat the surface of the catalyst. The surfactant, however, should not be completely eliminated, since it has the fundamental role of stabilizing the sample preventing nanoparticles from aggregation. It was evidenced that both the synthetic approach and the kind of support affect the catalysts’ activity. In fact, by focusing on the three different supports, with all the preparation methods, the ceria has proved to be the best support. This is due to its ability to obtain small gold nanoparticles and to its ability to accumulate oxygen. The most appropriate synthesis methodology proved to be the colloidal method with PVA. Recyclability issue was investigated too. View Full-Text
Keywords: gold catalyst; CeO2; ZrO2; TiO2; glucose; oxidation; Au sol-immobilization; PVA; PVP; THPC gold catalyst; CeO2; ZrO2; TiO2; glucose; oxidation; Au sol-immobilization; PVA; PVP; THPC
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Signoretto, M.; Menegazzo, F.; Di Michele, A.; Fioriniello, E. Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles. Catalysts 2016, 6, 87.

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