Journal
FUEL
Volume 284, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119027
Keywords
Selective cleavage; Ether C-O bond; Lignin-derived compounds; Ru catalysts; Isopropanol
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Funding
- Fundamental Research Funds for the Central Universities (China University of Mining Technology) [2019ZDPY19]
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The study found that isopropanol is a good hydrogen donor solvent to promote the hydrogenolysis of lignin model compounds, with a higher yield of products compared to under H-2 atmosphere.
Selective hydrogenolysis, the aromatic ether C-O bonds under mild conditions, is crucial for the valorization of lignin. In this context, the effects of H-2 and solvent on the hydrogenolysis of lignin model compounds over Ru catalysts were explored. With H-2 as hydrogen donor, the Ru/AC exhibited the highest activity for converting lignin model compounds into monomeric compounds, whereas H-2 led to low selectivity of aromatics. However, isopropanol was the good H-donor solvent, which could provide a large amount of active hydrogen to promote the cleavage of C-O bonds. Additionally, the yield of aromatics in isopropanol was higher than that under H-2 atmosphere. It could be ascribed to the fact that isopropanol is the protic solvent which displays Lewis basicity, and is a good H-bond donor and a good H-bond acceptor. The higher electron-releasing inductive effect of isopropanol made it easier to provide active hydrogen. Based on the experiments, the mechanism of benzyl phenyl ether hydrogenolysis in H-2 and isopropanol system was presented.
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