A novel cascade pyrolysis upgrading process for acid hydrolysis lignin (AHL), consisting of pyrolysis, catalytic upgrading of pyrolysis vapors, and pyrolysis char, was developed to improve the yield of value-added products (monophenolic chemicals and carbon materials). Pyrolysis of AHL at 450 °C and subsequent catalytic upgrading of pyrolysis vapors over Ni/H-ZSM-5 boosted the concentration of monophenolic chemicals in pyrolysis liquids by 58%. The carbon material prepared from pyrolysis char using KOH as activating agent exhibited a large specific surface area of 2902.5 m/g and a large total pore volume of 1.45 cm/g, thus affording good adsorption capacity for methylene blue (824.87 mg/g) and iodine (2333.17 mg/g). Moreover, the cascade pyrolysis upgrading of AHL achieved a yield of 68.52% desired products, which was much higher than the reported results (single production of monophenols and pyrolysis char). In summary, this work provides a potential reference for efficient utilization of lignin in large-scale applications.

中文翻译：

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酸解木质素级联热解协同生产单酚化学品和碳吸附材料

开发了一种新型的酸水解木质素（AHL）级联热解提质工艺，包括热解、热解蒸气催化提质和热解炭，以提高增值产品（单酚化学品和碳材料）的产率。 AHL 在 450 °C 下热解，随后在 Ni/H-ZSM-5 上对热解蒸气进行催化升级，使热解液中单酚化学物质的浓度提高了 58%。以KOH为活化剂的热解炭制备的碳材料表现出2902.5 m/g的大比表面积和1.45 cm/g的大总孔体积，从而对亚甲基蓝（824.87 mg/g）和碘（2333.17 毫克/克）。此外，AHL的级联热解升级实现了68.52%的目标产物收率，远高于报道的结果（单酚和热解炭的单一生产）。综上所述，该工作为木质素的大规模应用高效利用提供了潜在的参考。