摘要：In this study, synergic alkali catalysts (NaOH + NaAlO2) and Ni/ZrO2 were used for microwave-assisted lignin depolymerization. The effect of temperature, alkali dosage, Ni/ZrO2 dosage, and solid-to-liquid mass ratio was studied to improve the catalytic degradation efficiency and the yield of phenolic compounds. The results showed that more than 87.7% of lignin was converted and more than 0.582 mmol g(-1) total phenolic hydroxyl concentration was obtained at 180 degrees C. Furthermore, the characterization results of FT-IR, UV-VIS, TG-DSC, GPC and H-1-NMR clearly demonstrated that the synergistic system of an alkali and Ni/ZrO2 effectively improved the degradation efficiency and inhibited the formation of char, and resulted in a series of compounds with low molecular weight (<1000). In addition, the GC-MS results showed that the selectivity of the phenolic monomer product (68.2%) significantly improved after degradation. The lignin depolymerization mechanisms involved demethoxylation, dealkylation and decarbonylation.

ISSN号：2058-9883

卷、期、页：卷: 7期: 8页: 1750-1761

发表日期：2022-07-26

影响因子：4.239000

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）

发表期刊名称：REACTION CHEMISTRY & ENGINEERING

参与作者：Li, Heyu,Huang, Yingfang,Lin, Xiuhua,刘以凡,Lv, Yuancai,刘明华

第一作者：张玉明

论文类型：期刊论文

论文概要：Li, Heyu,Huang, Yingfang,Lin, Xiuhua,刘以凡,Lv, Yuancai,刘明华,张玉明，Microwave-assisted depolymerization of lignin with synergic alkali catalysts and a transition metal catalyst in the aqueous system，REACTION CHEMISTRY & ENGINEERING，2022，卷: 7期: 8页: 1750-1761

论文题目：Microwave-assisted depolymerization of lignin with synergic alkali catalysts and a transition metal catalyst in the aqueous system