School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China; State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, PR China.
State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, PR China.
Bioresour Technol. 2024 Nov;412:131365. doi: 10.1016/j.biortech.2024.131365. Epub 2024 Aug 28.
Camellia oleifera shell (COS) is a renewable biomass resource abundant in lignin with significant potential for producing phenolic monomers. However, the dearth of research has led to considerable resource wastage and environmental pollution. Herein, reductive catalytic fractionation (RCF) of COS was performed using noble metal catalysts in different solvents. An 11.1 wt% yield of phenolic monomers was achieved with 91% selectivity toward propylene-substituted monomers in HO/EtOH (3:7, v/v) cosolvent under N atmosphere. Notably, the highest phenolic monomer yield of 17.0 wt% was obtained with impressive selectivity (86.9%) toward propanol-substituted monomers in the presence of H. The GPC analysis and 2D HSQC NMR spectra indicated the effective depolymerization of lignin oligomers with catalysts. Phenolic monomers with ethyl, propyl, or propanol side chain could be produced from lignin-derived oligomers through hydrogenolysis, hydrogenation, and decarboxylation reactions. Overall, this study has paved the way for the valorization of COS lignin through the RCF strategy.
油茶壳（COS）是一种富含木质素的可再生生物质资源，具有很大的潜力可以用来生产酚类单体。然而，由于缺乏研究，导致了大量的资源浪费和环境污染。在此，我们采用贵金属催化剂，在不同溶剂中对 COS 进行了还原催化分级（RCF）。在 N2 气氛下，以 HO/EtOH（3:7，v/v）为共溶剂，酚类单体的收率可达 11.1wt%，对丙烯取代单体的选择性可达 91%。值得注意的是，在 H 的存在下，可获得最高的 17.0wt%酚类单体收率和 86.9%的丙烯醇取代单体的选择性。GPC 分析和 2D HSQC NMR 谱表明，催化剂可以有效地解聚木质素低聚物。通过氢解、加氢和脱羧反应，可以从木质素衍生的低聚物中得到带有乙基、丙基或丙醇侧链的酚类单体。总的来说，这项研究通过 RCF 策略为 COS 木质素的增值利用铺平了道路。
