Dihydroxyacetone conversion into lactic acid in an aqueous medium in the presence of metal salts: influence of the ionic thermodynamic equilibrium on the reaction performance - IFPEN - IFP Energies nouvelles Access content directly
Journal Articles Catalysis Science & Technology Year : 2018

Dihydroxyacetone conversion into lactic acid in an aqueous medium in the presence of metal salts: influence of the ionic thermodynamic equilibrium on the reaction performance

Abstract

The catalytic conversion of dihydroxyacetone (DHA) to lactic acid (LA) via pyruvaldehyde (PA) in aqueous media was studied using different homogeneous metal salts. A kinetic model was developed and the parameters corresponding to each reaction steps were estimated. Agreement between experiments and simulated results was excellent and the performance of the different catalysts was consistent with previous studies described in the literature. Aluminium salts, which show the best performance, were tested in a whole range of concentrations and at different pH, in order to identify the catalytically active ionic species. It was confirmed that the DHA to pyruvaldehyde (PA) dehydration step is catalyzed by both Brønsted and Lewis acids whereas the consecutive reaction of PA to LA is solely catalyzed by Lewis acids. Moreover, comparing thermodynamic analysis of the reaction media and kinetic parameters demonstrated that cationic hydroxyl-aluminium complexes [Al(OH)h] (3-h)+ formed in situ by the hydrolysis of the aluminium aqua complexes like [Al(OH2)6] 3+ are the most active Lewis acids.
Fichier principal
Vignette du fichier
jolimaitre dihydroxacetone-postprint.pdf (1.41 Mo) Télécharger le fichier
SI-rev.pdf (1.35 Mo) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

hal-01849651 , version 1 (26-07-2018)

Identifiers

Cite

E. Jolimaitre, D. Delcroix, N. Essayem, C. Pinel, M. Besson. Dihydroxyacetone conversion into lactic acid in an aqueous medium in the presence of metal salts: influence of the ionic thermodynamic equilibrium on the reaction performance. Catalysis Science & Technology, 2018, 8 (5), pp.1349 - 1356. ⟨10.1039/C7CY02385E⟩. ⟨hal-01849651⟩
71 View
219 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More