Methods for catalytic fractionation of biomass provide a means to convert lignin directly into monomers while generating a high-quality cellulosic stream, contrasting conventional biomass pretreatment strategies that prioritize the cellulosic fraction. Here, a nonprecious-metal Co-N-P-C catalyst is identified for aerobic oxidative catalytic fractionation (OCF) of poplar feedstock in dimethyl carbonate that achieves significantly higher yields of aromatic monomers (24 wt %) relative to those obtained with a recently reported Co-N-C catalyst in acetone solvent (15 wt %). Mechanistic studies indicate that the acidic properties of the catalyst contribute to its improved performance by promoting extraction of lignin from insoluble polysaccharides. This OCF process is complemented by the development of a new centrifugal partition chromatography (CPC) method that supports isolation of all five major aromatic monomers (syringic acid, syringaldehyde, vanillic acid, vanillin, and para-hydroxybenzoic acid) in a single liquid–liquid extraction purification step. This OCF/CPC sequence has important implications for future lignin valorization efforts.

中文翻译：

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使用 Co-N-P-C 催化剂对木质纤维素生物质进行氧化催化分馏并通过离心分配色谱一步分离芳香族单体


生物质催化分馏方法提供了一种将木质素直接转化为单体同时产生高质量纤维素流的方法，这与优先处理纤维素部分的传统生物质预处理策略形成鲜明对比。在此，确定了一种非贵金属 Co-N-P-C 催化剂，用于杨树原料在碳酸二甲酯中的需氧氧化催化分馏 (OCF)，与最近报道的 Co-N-C 催化剂相比，该催化剂可实现显着更高的芳香族单体产率 (24 wt%)丙酮溶剂（15 wt%）中的催化剂。机理研究表明，催化剂的酸性特性有助于从不溶性多糖中提取木质素，从而提高其性能。这种 OCF 工艺得到了新的离心分配色谱 (CPC) 方法的补充，该方法支持在单一液-液中分离所有五种主要芳香族单体（丁香酸、丁香醛、香草酸、香草醛和对羟基苯甲酸）提取纯化步骤。这种 OCF/CPC 序列对未来的木质素增值工作具有重要意义。