Deep eutectic solvents promote in-situ hydrogenolysis of Evodia lepta residue in preparing small aromatic phenol ketones

Shutian Chen,Yating Jian, Yaowei Liu,Zhanying Zhang, Xinlong Li,Qiang Yu

FUEL（2024）

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摘要

A deep eutectic solvent (DES) system of ChCl-MeOH-AlCl36H(2)O was developed for simultaneous dissolution of lignin from Evodia lepta residue and in-situ hydrogenolysis of lignin to aromatic phenol ketones using a Ru-C catalyst. The use of this DES led to a delignification of reached 93.1 % and cellulose and hemicellulose retentions of 95.3 % and 47.8 % respectively at the molar ratio of 1:12:0.2. While the total aromatic phenol ketones yield reached 92.4 % under 130 degrees C for 3 h with 17.2 % yields of vanillyl methyl ketone, 9.1 % syringylacetone, 25.4 % dihydroeugenol, and 40.7 % 4-propyl-2,6-dimethoxyphenol. The improved Ru-C properties in the DES system like thermal stability, the specific surface area and reduction potential contributed on the exceptional high product yields. The aromatic phenol ketones were 312.5 % higher than the reported yields of hydrogenolysis of aromatic monomers by ethanol/1,4-dioxane/formic acid under 300 degrees C-2 h conditions.

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关键词

Deep eutectic solvent,Lignin,In -situ hydrogenolysis,Evodia lepta residue

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