Journal
BIORESOURCE TECHNOLOGY
Volume 342, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125941
Keywords
Catalytic hydrogenolysis; Alkali lignin; Supercritical ethanol; Copper catalyst; Aromatic monomers
Funding
- C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2015M3D3A1A01064882, 2015M3D3A1A01064899]
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This study optimized the reaction conditions for the catalytic hydrogenolysis of alkali lignin using a copper catalyst on an MIL-101(Cr) support with supercritical ethanol, resulting in a 38.5% yield of aromatic monomers. The depolymerized lignin stream obtained can serve as a promising aromatic feedstock and carbon source for further microbial upgrading and bioconversion to produce various value-added products.
The catalytic hydrogenolysis of lignin has been reported as an effective approach for lignin depolymerization owing to its high efficiency for aromatic monomer production. In this study, a series of copper monometallic catalysts over an MIL-101(Cr) support were synthesized and used for the catalytic hydrogenolysis of alkali lignin using supercritical ethanol. First, the optimal copper catalyst for lignin hydrogenolysis was selected. Subsequently, the reaction conditions for catalytic hydrogenolysis were systematically optimized to maximize the total monomer yield. The optimal conditions were determined to be 6 h of reaction time, 20 min of sonication pretreatment, 50% catalyst loading, and 5% lignin loading. Under these conditions, an aromatic monomer yield of 38.5% was obtained; this depolymerized lignin stream, which is mainly composed of G-type monomers, can serve as a promising aromatic feedstock and carbon source for further microbial upgrading and bioconversion to produce various value-added products.
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