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Nanomaterials 2019, 9(3), 442; https://doi.org/10.3390/nano9030442

A Study of Catalytic Oxidation of a Library of C2 to C4 Alcohols in the Presence of Nanogold

1
Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
2
Institute of Materials Science, University of Silesia, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
3
Department of Physics, University of Hradec Králové, Rokitanského 62, 500-03 Hradec Králové, Czech Republic
4
Institute of Physics, University of Silesia, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
*
Author to whom correspondence should be addressed.
Received: 26 January 2019 / Revised: 9 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
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Abstract

The classical stoichiometric oxidation of alcohols is an important tool in contemporary organic chemistry. However, it still requires huge modifications in order to comply with the principles of green chemistry. The use of toxic chemicals, hazardous organic solvents, and the large amounts of toxic wastes that result from the reactions are a few examples of the problems that must be solved. Nanogold alone or conjugated with palladium were supported on different carriers (SiO2, C) and investigated in order to evaluate their catalytic potential for environmentally friendly alcohol oxidation under solvent-free and base-free conditions in the presence H2O2 as a clean oxidant. We tested different levels of Au loading (0.1–1.2% wt.) and different active catalytic site forms (monometallic Au or bimetallic Au–Pd sites). This provided new insights on how the structure of the Au-dispersions affected their catalytic performance. Importantly, the examination of the catalytic performance of the resulting catalysts was oriented toward a broad scope of alcohols, including those that are the most resistant to oxidation—the primary aliphatic alcohols. Surprisingly, the studies proved that Au/SiO2 at a level of Au loading as low as 0.1% wt. appeared to be efficient and prospective catalytic system for the green oxidation of alcohol. Most importantly, the results revealed that 0.1% Au/SiO2 might be the catalyst of choice with a wide scope of utility in the green oxidation of various structurally different alcohols as well as the non-activated aliphatic ones. View Full-Text
Keywords: nanogold catalysis; nanomaterials; alcohol oxidation; hydrogen peroxide; silicon dioxide; green chemistry nanogold catalysis; nanomaterials; alcohol oxidation; hydrogen peroxide; silicon dioxide; green chemistry
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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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Kapkowski, M.; Niemczyk-Wojdyla, A.; Bartczak, P.; Pyrkosz Bulska, M.; Gajcy, K.; Sitko, R.; Zubko, M.; Szade, J.; Klimontko, J.; Balin, K.; Polanski, J. A Study of Catalytic Oxidation of a Library of C2 to C4 Alcohols in the Presence of Nanogold. Nanomaterials 2019, 9, 442.

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