Kinetic analysis of the catalytic hydrogenation of alkyl levulinates to γ-valerolactone
| Autor: | Mohammad G. Al-Shaal, Fabian Joschka Holzhäuser, Leila Negahdar, Regina Palkovits |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Valerolactone 010405 organic chemistry Chemistry Applied Mathematics General Chemical Engineering Kinetics Lignocellulosic biomass General Chemistry 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis Residue (chemistry) chemistry.chemical_compound medicine Levulinic acid Organic chemistry Alkyl Activated carbon medicine.drug |
| Zdroj: | Chemical Engineering Science. 158:545-551 |
| ISSN: | 0009-2509 |
| Popis: | γ-Valerolactone is considered as a promising platform chemical from lignocellulosic biomass. This study focusses on the kinetics of the production of γ-valerolactone from three different esters of levulinic acid using Ru supported on activated carbon as hydrogenation catalyst. Methyl, ethyl, and n-butyl levulinates are used as substrates. The transformation of these alkyl levulinates proceeds through a hydrogenation of the substrate to the intermediate γ-hydroxy valeriate followed by lactonization to form γ-valerolactone. Alkyl levulinates with shorter alkyl residue show an accelerated formation of γ-valerolactone. Nevertheless, an efficient transformation of all alkyl levulinates into γ-valerolactone is possible. The kinetic study indicates that at all reaction temperatures, lactonization occurs slower than hydrogenation and presents the rate-determining step. Analysis of the kinetic data shows the activation energies of hydrogenation and lactonization increase in the following order: methly levulinate -1 and 50–63 kJ mol -1 , respectively, emphasizing the potential of alkyl levulinates as promising intermediates for γ-valerolactone formation. |
| Databáze: | OpenAIRE |
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