Selective Catalytic Depolymerization of Lignin to Targeted Phenolic Monomers Using Noble Metals Supported on MgAl2O4 without External Hydrogen

文献类型： 外文期刊

第一作者： Qiu, Shukun

作者： Qiu, Shukun;Wu, Zhiping;Qiu, Shukun;Liu, Xudong;Liu, Pengyun;Chao, Yan;Liu, Rukuan;Li, Changzhu;Xiao, Zhihong;Jiang, Zhicheng;Xie, Mingyu;Zhao, Zicheng

作者机构：

关键词： lignin valorization; reductivecatalytic depolymerization; MgAl2O4 spinel; H-2-free; phenolic monomers

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0021-8561

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Reductive catalytic depolymerization of lignin to obtain value-added phenolic monomers has great potential. However, achieving the efficient depolymerization of lignin under hydrogen-free conditions while selectively obtaining specific monomers remains a significant challenge. In this study, MgAl2O4-based catalysts with well-developed pore structures and abundant oxygen vacancies were fabricated, exhibiting excellent catalytic performance in the depolymerization of various kinds of biomass. Importantly, a 39.0 wt % yield of phenolic monomers under hydrogen-free conditions over 5 wt % Pd/MgAl2O4 was comparable to that obtained under a H-2 atmosphere from poplar. Furthermore, a high selectivity of 91.3% toward propanol-substituted monomers was obtained from pine. The efficient catalytic hydrogenolysis ability of the catalyst could be attributed to the highly dispersed small-sized metal nanoparticles, strong interaction between noble metal and MgAl2O4 support, and abundant medium-to-strong acidic sites. This study provides a green and efficient catalytic strategy for the valorization of lignin, contributing to the fabrication of phenolic monomers with high selectivity.

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