Glycerol oxidation over supported gold catalysts: The combined effect of au particle size and basicity of support

Ekaterina Pakrieva, Ekaterina Kolobova, Dmitrii German, Marta Stucchi, Alberto Villa, Laura Prati, Sónia A.C. Carabineiro, Nina Bogdanchikova, Vicente Cortés Corberán, Alexey Pestryakov

Research output: Contribution to journalArticle

Abstract

Gold 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.

Original languageEnglish
Article number1016
JournalProcesses
Volume8
Issue number9
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Base additives
  • Catalyst selectivity
  • Glyceric acid
  • Glycerol oxidation
  • Glycolic acid
  • Gold catalysts
  • Tartronic acid

ASJC Scopus subject areas

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Process Chemistry and Technology

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    Pakrieva, E., Kolobova, E., German, D., Stucchi, M., Villa, A., Prati, L., Carabineiro, S. A. C., Bogdanchikova, N., Corberán, V. C., & Pestryakov, A. (2020). Glycerol oxidation over supported gold catalysts: The combined effect of au particle size and basicity of support. Processes, 8(9), [1016]. https://doi.org/10.3390/pr8091016