Herein, a catalytic reductive fractionation of lignocellulose is presented using a heterogeneous cobalt catalyst and formic acid or formate as a hydrogen donor. The catalytic reductive fractionation of untreated birch wood yields monophenolic compounds in up to 34 wt % yield of total lignin, which corresponds to 76 % of the theoretical maximum yield. Model compound studies revealed that the main role of the cobalt catalyst is to stabilize the reactive intermediates formed during the organosolv pulping by transfer hydrogenation and hydrogenolysis reactions. Additionally, the cobalt catalyst is responsible for depolymerization reactions of lignin fragments through transfer hydrogenolysis reactions, which target the β‐O‐4′ bond. The catalyst could be recycled three times with only negligible decrease in efficiency, showing the robustness of the system.

中文翻译：

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木质素纤维素钴分馏得到单酚类化合物对木质素的平衡作用

本文中，提出了使用非均相钴催化剂和甲酸或甲酸作为氢供体的木质纤维素的催化还原性分馏。未经处理的桦木的催化还原分馏产生的单酚类化合物的总木质素产率高达34％（重量），相当于理论最大产率的76％。模型化合物的研究表明，钴催化剂的主要作用是通过转移氢化和氢解反应来稳定有机溶剂制浆过程中形成的反应性中间体。此外，钴催化剂还负责通过转移氢解反应（针对β- O）的木质素片段的解聚反应。‐4'键。该催化剂可以循环使用三遍，而效率的降低几乎可以忽略不计，显示了系统的坚固性。