Sequential catalytic lignin valorization and bioethanol production: an integrated biorefinery strategy

作者：Yilu Wu, Changsheng Su, Zicheng Liao, Gege Zhang, Yongjie Jiang, Yankun Wang, Changwei Zhang, Di Cai, Peiyong Qin, Tianwei Tan · 发表于：Biotechnology for Biofuels and Bioproducts · 年份：2024 · DOI：10.1186/s13068-024-02459-8 · 被引用次数：22 · 研究领域：Lignin and Wood Chemistry、Biofuel production and bioconversion、Catalysis for Biomass Conversion

Abstract Background The effective valorization of lignin and carbohydrates in lignocellulose matrix under the concept of biorefinery is a primary strategy to produce sustainable chemicals and fuels. Based on the reductive catalytic fractionation (RCF), lignin in lignocelluloses can be depolymerized into viscous oils, while the highly delignified pulps with high polysaccharides retention can be transformed into various chemicals. Results A biorefinery paradigm for sequentially valorization of the main components in poplar sawdust was constructed. In this process, the well-defined low-molecular-weight phenols and bioethanol were co-generated by tandem chemo-catalysis in the RCF stage and bio-catalysis in fermentation stage. In the RCF stage, hydrogen transfer reactions were conducted in one-pot process using Raney Ni as catalyst, while the isopropanol (2-PrOH) in the initial liquor was served as a hydrogen donor and the solvent for lignin dissolution. Results indicated the proportion of the 2-PrOH in the initial liquor of RCF influenced the chemical constitution and yield of the lignin oil, which also affected the characteristics of the pulps and the following bioethanol production. A 67.48 ± 0.44% delignification with 20.65 ± 0.31% of monolignols yield were realized when the 2-PrOH:H 2 O ratio in initial liquor was 7:3 (6.67 wt% of the catalyst loading, 200 °C for 3 h). The RCF pulp had higher carbohydrates retention (57.96 ± 2.78 wt%), which was converted to 21.61 ± 0.62 g/L ...