Abstract
In this work, we developed an approach of one-pot complete catalytic conversion of woody biomass into two value product streams: lignin-derived aromatics (monomer yield of 68.54% and oligomer yield of 29.65% based on lignin mass) and (semi-)cellulose-derived small molecular alcohols (about 59.60% of biomass mass). These could be afforded by conducting lignocellulose depolymerization over metal-alkaline catalysts in a mixed n-butanol/H2O solvent system at 250 °C and 30 bar H2. In the valorization process, the homogenous mixture of n-butanol-H2O solvents extract and depolymerize both lignin and hemicellulose, while the catalysts and H2 are essential to cleave the inter-/intramolecular linkage of lignocellulose into target products. After the reaction, the phase separation of n-butanol and H2O takes place when system temperature drops below 125 °C, providing a mild and effective strategy to isolate lignin-derived aromatics (n-butanol phase) from small molecular alcohols/acids (aqueous phase). Ru/C and alkali catalysts are collected by filtration from n-butanol phase and H2O phase, respectively. Meanwhile, the effect of metal-alkali coupled catalysts facilitates the cleavage of β-O-4 linkage of lignin and increases the attainability of (semi-)cellulose-derived oligomers and the small molecular alcohols. This catalytic system provides a versatile valorization approach for biomass catalysis to bio-based chemicals.
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This work was supported by Basic scientific research operating expenses project of Key Lab. of Biomass Energy and Material, Jiangsu Province (JSBEM201902), the Natural Science Foundation of Guangdong Province (No.2019A1515012220), the National Key R&D Program of China (2018YFB1501504), the NSFC (Natural Science Foundation of China) project (No.51676191, 51536009).
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Lv, W., Zhu, Y., Mai, W. et al. Metal-alkali catalytic valorization of lignocellulose towards aromatics and small molecular alcohols and acids in a holistic approach. Cellulose 28, 9589–9611 (2021). https://doi.org/10.1007/s10570-021-04156-3
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DOI: https://doi.org/10.1007/s10570-021-04156-3