Abstract A novel strategy was proposed for the cleavage of C O C bonds in β-O-4 lignin substrate. 2-(2′-methoxyphenoxyl)-1-phenylethanol was used as a lignin dimer model compound with a β-O-4 ether linkage and a hydroxyl group on α-C position. Mo-V-based bifunctional catalysts have been developed to selectively catalyze the oxidation of Cα-OH and depolymerize β-O-4 dimers under mild reaction conditions. In addition, the catalysts were characterized by XRD, SEM, TPR, NH3-TPD and N2 adsorption. At room temperature, the conversion of dimer reached up to 89% within 4 h. Based on the analysis of HPLC-MS results, a two-step oxidation-cleavage pathway for lignin depolymerization was proposed. In the catalytic reaction process, the Cα-OH in the lignin dimer was first oxidized to obtain Cα ketone, and then the Cα ketone intermediate was further catalyzed to break the β-O-4 bond. In the study, aromatic monomer compounds were obtained under the Mo-V-based bifunctional catalysts.

中文翻译：

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用于室温下催化转化木质素二聚体模型化合物的高活性 Mo-V 基双功能催化剂

摘要 提出了一种裂解 β-O-4 木质素底物中 COC 键的新策略。2-(2'-甲氧基苯氧基)-1-苯基乙醇用作木质素二聚体模型化合物，具有 β-O-4 醚键和 α-C 位置的羟基。已经开发出基于 Mo-V 的双功能催化剂，以在温和的反应条件下选择性催化 Cα-OH 的氧化和解聚 β-O-4 二聚体。此外，还通过XRD、SEM、TPR、NH3-TPD和N2吸附对催化剂进行了表征。在室温下，二聚体的转化率在 4 小时内达到 89%。基于HPLC-MS结果的分析，提出了木质素解聚的两步氧化-裂解途径。在催化反应过程中，木质素二聚体中的Cα-OH首先被氧化得到Cα酮，然后进一步催化Cα酮中间体破坏β-O-4键。在研究中，芳族单体化合物是在基于 Mo-V 的双功能催化剂下获得的。