Conversion of lignin to valuable chemicals without external hydrogen presents a significative but challengeable endeavor. Herein, an efficient approach has been proposed for the lignin hydrogenolysis with in-situ hydrogen in the presence of Ni nanoparticles nested in layered double oxides (LDOs). 84.4 % conversion of lignin was achieved over 30Ni-Mg3Al-LDOs, affording a 21.3 % yield of monomers, and 38.0 % of which was identified as 4-ethylphenol. Catalyst characterizations revealed that this excellent performance of lignin conversion should be ascribed to the highly dispersed Ni nanoparticles, strong interfacial interactions between Ni and LDOs, and suitable basicity of catalysts. Furthermore, the roles of the solvent (1,4-dioxane aqueous solution) and the lignin methoxyl groups as hydrogen resources were distinguished, and the former acted as an initial hydrogen to promote lignin depolymerization, and the latter was responsible for the high yield of 4-ethylphenol. In addition, a plausible reaction pathway for lignin hydrogenolysis has been proposed.

中文翻译：

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原位生成氢气，用于木质素的选择性氢解，由具有嵌套 Ni 纳米颗粒的 Mg-Al 混合氧化物催化


在没有外部氢的情况下将木质素转化为有价值的化学品是一项重要但具有挑战性的努力。在此，已经提出了一种在嵌套在层状双氧化物 （LDO） 中的 Ni 纳米颗粒存在下用原位氢进行木质素氢解的有效方法。木质素在 30Ni-Mg3Al-LDO 上实现了 84.4% 的转化率，单体产量为 21.3%，其中 38.0% 被鉴定为 4-乙基苯酚。催化剂表征表明，木质素转化的这种优异性能应归因于高度分散的 Ni 纳米颗粒、Ni 和 LDO 之间的强界面相互作用以及合适的催化剂碱度。此外，区分了溶剂（1,4-二恶烷水溶液）和木质素甲氧基作为氢资源的作用，前者作为初始氢促进木质素解聚，后者是 4-乙基苯酚高产率的原因。此外，已经提出了一种合理的木质素氢解反应途径。