Catalytic Hydrogenation of Alkylphenols for Renewable Caprolactone
Journal Article
·
· ACS Sustainable Chemistry & Engineering
- University of Minnesota, Minneapolis, MN (United States)
- University of Cambridge (United Kingdom)
Selective hydrogenation of lignin-derived alkyl-phenol to alkyl-cyclohexanone is a key step in the synthesis of renewable caprolactone from lignin-derived monomers. Selective hydrogenation of p-cresol, a model compound for lignin-derived monomers, to 4-methyl-cyclohexanone was conducted using Pd/γ-Al2O3 in a continuous three-phase flow reactor with side products of 4-methyl cyclohexanol. High conversion (85%) and selectivity (>93%) were demonstrated at ambient reaction pressure. Evaluation of the hydrogenation at different reaction parameters showed that the reaction selectivity was determined by the surface coverage of p-cresol and 4-methyl cyclohexanone. Furthermore, high selectivity to 4-methyl cyclohexanone was also attributed to the lower apparent activation barrier of p-cresol hydrogenation (67 ± 2 kJ mol–1) compared to that of hydrogenation 4-methyl cyclohexanone (92 ± 11 kJ mol–1), with a faster rate of initial hydrogenation of p-cresol relative to carbonyl hydrogenation of 4-methyl-cyclohexanone.
- Research Organization:
- University of Minnesota, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- EE0009304
- OSTI ID:
- 2569386
- Journal Information:
- ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 36 Vol. 12; ISSN 2168-0485
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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