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<p>Lignin refining still suffers from great challenges of selective depolymerization and cleavage of stubborn C‒C linkages. Here, a robust atomically dispersed Cu/Ni-SA@HNC catalyst is fabricated for super-selective hydrogenolysis of lignin and model compounds via an unusual “preferential C<sub>α</sub>–C<sub>β</sub> bond cleavage in β-O-4 linkages” pathway, affording toluene in yield up to 75.7% from β-O-4 model compounds, and up to 33.7 ± 1.6 wt% (nine parallel experiments) from poplar lignin. The catalyst exhibits high stability, and the scale-up potential is demonstrated by the high space-time yield of toluene (33.7 g·g<sub>cat</sub><sup>−1</sup>·h<sup>−1</sup>) in continuous flow reaction of β-O-4 model compound. The origin of the extraordinary selectivity towards C<sub>α</sub>–C<sub>β</sub> bond cleavage rather than C‒O bond cleavage in β-O-4 model compounds is uncovered. This work conquers the major challenges in lignin valorization by using non-noble dual-metal single-atom catalyst, not only showcasing the application perspective of atomically dispersed catalysts in biopolymer refinery, but also providing a cost-efficient, petroleum independent solution to valuable commodity chemicals.</p>

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Catalytic refining lignin into toluene over atomically dispersed Cu/Ni dual sites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月26日

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  • Xin Zhao,
  • Changzhi Li,
  • Jie Wen,
  • Qian Qiang,
  • Zirong Shen,
  • Haipeng Yu,
  • Xin Zhou,
  • Fengxia Yue,
  • Ruiqi Fang,
  • Yingwei Li,
  • Tao Zhang

摘要

Lignin refining still suffers from great challenges of selective depolymerization and cleavage of stubborn C‒C linkages. Here, a robust atomically dispersed Cu/Ni-SA@HNC catalyst is fabricated for super-selective hydrogenolysis of lignin and model compounds via an unusual “preferential Cα–Cβ bond cleavage in β-O-4 linkages” pathway, affording toluene in yield up to 75.7% from β-O-4 model compounds, and up to 33.7 ± 1.6 wt% (nine parallel experiments) from poplar lignin. The catalyst exhibits high stability, and the scale-up potential is demonstrated by the high space-time yield of toluene (33.7 g·gcat−1·h−1) in continuous flow reaction of β-O-4 model compound. The origin of the extraordinary selectivity towards Cα–Cβ bond cleavage rather than C‒O bond cleavage in β-O-4 model compounds is uncovered. This work conquers the major challenges in lignin valorization by using non-noble dual-metal single-atom catalyst, not only showcasing the application perspective of atomically dispersed catalysts in biopolymer refinery, but also providing a cost-efficient, petroleum independent solution to valuable commodity chemicals.