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• W3092298500 abstract "Abstract Recently, a two-step strategy involving oxidative activation and reductive depolymerization becomes very popular for lignin conversion. However, both positive and negative results are obtained, and the detailed mechanism is still unknown. This study thoroughly investigated the effects of several key factors, including hydrogen pressure, reaction temperature, and catalyst compositions, on the reductive conversion of oxidized lignin (ligninOX) to aromatics. For lignin oxidative activation, FT-IR, 2D NMR, and TG/DTG were used to prove that hydroxyl groups at lignin side chains had been successfully oxidized to carbonyl groups by AcNH-TEMPO/HNO3/HCl system. For ligninOX reductive conversion, pathways and mechanisms were explored, and the applicable conditions of this strategy were determined. Under relative moderate hydrogen pressure (e.g. 2 Mpa) over metal–acid catalysts, e.g. Ru/γ-Al2O3 combined with Hf(OTf)4), an obvious advantage of ligninOX conversion was found. Yield of valuable product from ligninOX was 42.98% which was much higher than that (10.99%) from unoxidized lignin. While, under high hydrogen pressure or promoted by catalysts with high hydrogenation activities, ligninOX tended to be reconverted to original lignin structures with loss of its conversion advantage. 2-phenoxyacetophenone as a ligninOX model was used to verify this speculation and to predict reaction pathways over different catalytic systems. These results proved that a catalyst with both hydrogenolysis and hydrolysis activity was essential for efficient ligninOX depolymerization." @default.
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• W3092298500 date "2021-01-01" @default.
• W3092298500 modified "2023-09-24" @default.
• W3092298500 title "Insights into the oxidation–reduction strategy for lignin conversion to high-value aromatics" @default.
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• W3092298500 doi "https://doi.org/10.1016/j.fuel.2020.119333" @default.
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