Lignin is the world’s greatest renewable aromatic biomass resource, with considerable potential for the development of high-value-added compounds. Herein, wet impregnation was employed to create Co-Mo/ATP-CZO bimetallic catalysts, which were then used to catalyze the depolymerization of lignin in ethanol and isopropanol. The findings of the characterization revealed that doping Mo metals resulted in the change of metallic oxide phase, which increased the oxygen vacancy (O_V), improved metal-carrier interaction, and decreased acid center content. The results of the experiments demonstrated that catalytic hydrogenation with a 12Mo-20Co/ATP-CZO catalyst at 240 °C for 8 h produced the maximum yield of bio-oil (57.44 wt%, including 37.58 wt% of monomer). Under these conditions, the bio-oil had a higher heating value of 33.20 MJ/kg, which was significantly higher than the alkali lignin’s 19.62 MJ/kg. Catalyst stability tests also revealed good recyclability. This research will provide an efficient method for depolymerizing lignin.

Graphical abstract

中文翻译：

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凹凸棒石-Ce0.75Zr0.25O2负载非贵重Co-Mo双金属催化剂对碱木质素进行氢解

木质素是世界上最大的可再生芳香生物质资源，具有开发高附加值化合物的巨大潜力。本文采用湿法浸渍制备 Co-Mo/ATP-CZO 双金属催化剂，然后将其用于催化木质素在乙醇和异丙醇中的解聚。表征结果表明，掺杂 Mo 金属会导致金属氧化物相的变化，从而增加氧空位（O _V)，改善金属-载体相互作用，降低酸中心含量。实验结果表明，用 12Mo-20Co/ATP-CZO 催化剂在 240 ℃下催化加氢 8 h 产生的生物油产率最高（57.44 wt%，包括 37.58 wt% 的单体）。在这些条件下，生物油的热值较高，为33.20 MJ/kg，明显高于碱木质素的19.62 MJ/kg。催化剂稳定性测试也显示出良好的可回收性。该研究将为木质素的解聚提供一种有效的方法。

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