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Glycerol Oxidation over Supported Gold Catalysts: The Combined Effect of Au Particle Size and Basicity of Support

AuthorsPakrieva, Ekaterina; Kolobova, Ekaterina; German, Dmitrii; Stucchi, Marta; Villa, Alberto; Prati, Laura; Carabineiro, Sónia. A.C.; Bogdanchikova, Nina; Cortés Corberán, Vicente CSIC ORCID; Pestryakov, Alexey
KeywordsGold catalysts
Glycerol oxidation
Catalyst selectivity
Glyceric acid
Glycolic acid
Tartronic acid
Base additives
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationProcesses 8(9): 1016 (2020)
AbstractGold nanoparticles supported on various oxides (CeO2, CeO2/TiO2, MgO, MgO/TiO2, La2O3, La2O3/TiO2) (with 4 wt.% Au loading) were investigated in the liquid (aqueous) phase oxidation of glycerol by molecular oxygen under mild conditions, in the presence of alkaline earth (CaO, SrO and MgO) or alkaline (NaOH) bases. Full conversion and selectivity between 38 and 68% to sodium glycerate were observed on different Au supported catalysts (Au/MgO/TiO2, Au/La2O3/TiO2, Au/CeO2 and Au/CeO2/TiO2). The combined effect of Au particle size and basicity of the support was suggested as the determining factor of the activity. Agglomeration of gold nanoparticles, found after the reaction, led to the deactivation of the catalysts, which prevents the further oxidation of sodium glycerate into sodium tartronate. Promising results were obtained with the use of alkaline earth bases (CaO, SrO, MgO), leading to the formation of free carboxylic acids instead of salts, which are formed in the presence of the more usual base, NaOH.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/pr8091016
Appears in Collections:(ICP) Artículos
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