Citation: Jiaguang Zhang, Loris Lombardo, Gökalp Gözaydın, Paul J. Dyson, Ning Yan. Single-step conversion of lignin monomers to phenol: Bridging the gap between lignin and high-value chemicals[J]. Chinese Journal of Catalysis, ;2018, 39(9): 1445-1452. doi: 10.1016/S1872-2067(18)63132-8 shu

Single-step conversion of lignin monomers to phenol: Bridging the gap between lignin and high-value chemicals

a Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585 Singapore;
b School of Chemistry, University of Lincoln, Joseph Banks Laboratories, Green Lane, Lincoln, LN6 7DL, United Kingdom;
c Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne(EPFL), CH-1015, Switzerland

Received Date: 28 June 2018
Revised Date: 4 July 2018

Fund Project: This work was supported by the Ministry of Education in Singapore Tier-1 (R-279-000-479-112) and Tier-2 (R-279-000-462-112) Projects.

Transformation of lignin into high-value chemicals is hampered by the complexity of monomers obtained from lignin depolymerization. Here we report a strategy, composed of hydro-demethoxylation and de-alkylation reactions, that is able to chemically converge various lignin-derived phenolic monomers into phenol in a single-step. Using 2-methoxy-4-propylphenol as a model compound, Pt/C exhibited the best performance in hydro-demethoxylation reaction affording >80% 4-propylphenol from 2-methoxy-4-propylphenol, while H-ZSM-5 was identified as the most suitable catalyst for de-alkylation, achieving 83% yield of phenol from 4-propylphenol. Since the two catalysts operate under compatible conditions, combining the two catalysts to simultaneously promote both hydro-demethoxylation and de-alkylation reactions was achieved. Configuration of how to organize the catalysts is a critical parameter, where the physical mixture of the two was most effective, providing over 60% phenol from 2-methoxy-4-propylphenol in a single-step.
- Lignin,
- Phenol,
- Zeolite,
- De-alkylation,
- Hydro-demethoxylation
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