To cope with the challenge of insufficient interaction between lignin macromolecules and catalytic active sites in heterocatalysis systems which hindered the efficient hydrogenolysis of lignin, a lignin-derived N-doped macroporous carbon supported Ru catalyst (Ru/LNPC) was prepared via the pyrolysis of alkali lignin with potassium hydroxide as the activator and ammonium oxalate as the pore forming agent. The LNPC carrier featured a hierarchical porous structure with the diameter of macropores ranging from 50 nm to 10 μm, enhancing the adequately contact between the lignin macromolecules and Ru NPs. The doping nitrogen in the carbon carrier led to well dispersed Ru nanoparticles with average size of 1.08 nm, providing abundant active metallic centers. Therefore, Ru/LNPC exhibited excellent catalytic activity and stability to hydrogenolysis of lignin. Under the condition of 1.0 MPa H₂ at 280 ºC for 2 h, Ru/LNPC contributed to the yield of 45.6 % aromatic monomers from the depolymerization of lignin. After five recycling, Ru/LNPC still showed significant activity. This work provided a new strategy for designing catalysts for efficient hydrogenolysis of lignin and further facilitating its high-value utilization.

中文翻译：

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N掺杂大孔碳负载Ru催化剂的高效木质素加氢


为应对多源催化体系中木质素大分子与催化活性位点相互作用不足阻碍木质素高效氢解的挑战，以氢氧化钾为活化剂，草酸铵为成孔剂，通过碱木质素热解制备了木质素衍生的 N 掺杂大孔碳负载 Ru 催化剂 （Ru/LNPC）。LNPC 载体具有多级多孔结构，大孔直径范围为 50 nm 至 10 μm，增强了木质素大分子与 Ru NPs 之间的充分接触。碳载体中的掺杂氮导致 Ru 纳米颗粒分散良好，平均尺寸为 1.08 nm，提供丰富的活性金属中心。因此，Ru/LNPC 表现出优异的催化活性和对木质素氢解的稳定性。在 1.0_{MPa H 2} 和 280 ºC 2 的条件下，持续 2 小时，Ru/LNPC 有助于木质素解聚产生 45.6% 的芳香族单体。经过 5 次回收，Ru/LNPC 仍然显示出显著的活性。这项工作为设计用于木质素高效氢解的催化剂并进一步促进其高值化利用提供了一种新策略。