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
| Autor: | Damien Delcroix, Catherine Pinel, Elsa Jolimaitre, Michèle Besson, Nadine Essayem |
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| Přispěvatelé: | Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IFP Energies nouvelles (IFPEN), IRCELYON-C'Durable (CDURABLE), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) |
| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
Reaction step Chemistry Inorganic chemistry Cationic polymerization Ionic bonding Dihydroxyacetone 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Hydrolysis chemistry.chemical_compound [CHIM]Chemical Sciences Pyruvaldehyde Lewis acids and bases |
| Zdroj: | Catalysis Science & Technology Catalysis Science & Technology, Royal Society of Chemistry, 2018, 8 (5), pp.1349-1356. ⟨10.1039/C7CY02385E⟩ |
| ISSN: | 2044-4761 2044-4753 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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