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Synergistic magnetic Cu-Fe catalysts on N-doped biochar for efficient alkali lignin catalytic depolymerization into monophenols
Industrial Crops and Products ( IF 5.6 ) Pub Date : 2024-09-16 , DOI: 10.1016/j.indcrop.2024.119663
Jiubing Zhang, Yuanyuan Ge, Zhili Li

Alkali lignin, a major by-product of papermaking, poses disposal challenges, hindering the full valorization of lignocellulose in sustainable biorefineries. One-pot lignin catalytic depolymerization (LDP) in water offers a promising route for producing valuable phenolic compounds. This study reports the successful synthesis of in-situ N-doped biochar supported CuxFey catalysts (CuxFey/N-BC) via a one-step carbothermal reduction method, enabling LDP in water without the need for external hydrogen, additives, alcohol solvent, or co-catalysts. Notably, the Cu5Fe1/N-BC could achieve remarkable catalytic performance under mild reaction conditions (280 °C, 6 h, 18 mL water), yielding 80.84±2.23 mg/g of monophenol, 56.17±1.32 % of bio-oil, and a lignin conversion rate of 80.66±0.73 %. This significantly surpassed the performance of monometallic catalysts and bare biochar. The synergistic effects of intermetallic interactions and nitrogen doping were proposed to create abundant active sites and rich pore structures, promoting efficient LDP reactions. Furthermore, the Cu5Fe1/N-BC exhibited excellent recyclability, with minimal activity loss (2.79 %) per cycle, due to its strong magnetism and favorable interactions. Mechanism investigation revealed that the Cu5Fe1/N-BC efficiently cleaved the C-O and C-C bonds in lignin, and led to the targeted production of guaiacyl phenols. This study provides valuable insights and practical strategy for valorizing lignin into valuable chemicals, advancing its utilization in various applications.



中文翻译:


N掺杂生物炭上的协同磁性Cu-Fe催化剂用于有效地将碱木质素催化解聚为单酚



碱木质素是造纸的主要副产品,带来了处置挑战,阻碍了木质纤维素在可持续生物精炼厂中的全面增值。水中一锅木质素催化解聚(LDP)为生产有价值的酚类化合物提供了一条有前途的途径。这项研究报告了通过一步碳热还原法成功合成了原位氮掺杂生物炭负载的 Cu x Fe y催化剂(Cu x Fe y /N-BC),无需外部氢气即可在水中实现 LDP,添加剂、醇溶剂或助催化剂。值得注意的是,Cu 5 Fe 1 /N-BC在温和的反应条件下(280℃,6小时,18mL水)可以实现显着的催化性能,产生80.84±2.23mg/g的单酚,56.17±1.32%的生物-油,木质素转化率为80.66±0.73%。这显着超过了单金属催化剂和裸生物炭的性能。提出金属间相互作用和氮掺杂的协同效应,以创造丰富的活性位点和丰富的孔隙结构,促进高效的LDP反应。此外,由于其强磁性和有利的相互作用,Cu 5 Fe 1 /N-BC表现出优异的可回收性,每个循环的活性损失最小(2.79%)。机理研究表明,Cu 5 Fe 1 /N-BC 有效裂解木质素中的 CO 和 CC 键,并导致愈创木酚的定向生产。这项研究为将木质素转化为有价值的化学品提供了宝贵的见解和实用的策略,促进其在各种应用中的利用。

更新日期:2024-09-17
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