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Article

Efficient Oxidative Esterification of Furfural Using Au Nanoparticles Supported on Group 2 Alkaline Earth Metal Oxides

1
Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo 05508-000, Brazil
2
Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181—UCCS—Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
3
Institut de Chimie Physique, Université Paris-Saclay, UMR 8000 CNRS, 91405 Orsay, France
4
Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(4), 430; https://doi.org/10.3390/catal10040430
Received: 30 March 2020 / Revised: 11 April 2020 / Accepted: 13 April 2020 / Published: 15 April 2020
Furfural (FF) is a strategic product for the development of highly valued chemicals from biomass. The oxidation product of FF, furoic acid (FA), is an important precursor for the synthesis of green esters, such as methyl furoate. Taking into account issues with the direct furfural oxidation, furfural derivatives, such as alkyl furoates, can be easily prepared via oxidative esterification. Here, Au nanoparticles that were immobilized on alkaline-earth metal oxide supports were studied for the oxidative esterification of furfural while using alcohol as both reactant and solvent. The formation of esters is favored by the presence of basic sites on catalyst surface, resulting in high selectivity, preventing the formation of the acetal as a by-product. The Au/MgO sample provided up to 95% methyl furoate (MF) yield, a fast reaction rate, and high performance for furfural:Au molar ratios between 50 and 300. Furthermore, this catalyst was stable during reuse, since both the selectivity and the activity were maintained after four cycles. Oxidative esterification products were achieved in the presence of other alcohols, leading to the formation of esters of up to C5 (isopentyl furoate) with high selectivity (>99%). Linear and branched esters were formed, but the long-chain linear alcohols resulted in higher yields, such as n-butyl furoate in 94% yield. View Full-Text
Keywords: gold nanoparticles; esterification; green oxidation; methyl furoate; biomass gold nanoparticles; esterification; green oxidation; methyl furoate; biomass
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MDPI and ACS Style

P. Ferraz, C.; Braga, A.H.; Ghazzal, M.N.; Zieliński, M.; Pietrowski, M.; Itabaiana, I., Jr.; Dumeignil, F.; Rossi, L.M.; Wojcieszak, R. Efficient Oxidative Esterification of Furfural Using Au Nanoparticles Supported on Group 2 Alkaline Earth Metal Oxides. Catalysts 2020, 10, 430. https://doi.org/10.3390/catal10040430

AMA Style

P. Ferraz C, Braga AH, Ghazzal MN, Zieliński M, Pietrowski M, Itabaiana I Jr., Dumeignil F, Rossi LM, Wojcieszak R. Efficient Oxidative Esterification of Furfural Using Au Nanoparticles Supported on Group 2 Alkaline Earth Metal Oxides. Catalysts. 2020; 10(4):430. https://doi.org/10.3390/catal10040430

Chicago/Turabian Style

P. Ferraz, Camila, Adriano H. Braga, Mohamed N. Ghazzal, Michał Zieliński, Mariusz Pietrowski, Ivaldo Itabaiana Jr., Franck Dumeignil, Liane M. Rossi, and Robert Wojcieszak. 2020. "Efficient Oxidative Esterification of Furfural Using Au Nanoparticles Supported on Group 2 Alkaline Earth Metal Oxides" Catalysts 10, no. 4: 430. https://doi.org/10.3390/catal10040430

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