文献类型： 外文期刊

第一作者： Zhou, Xue-Fei

作者： Zhou, Xue-Fei;Zhou, Xue-Fei;Zhou, Xue-Fei;Zhou, Xue-Fei;Zhou, Xue-Fei

作者机构：

关键词： biomimetic catalysis; one-pot process; recalcitrant structure; oxidation; lignin

期刊名称：CHIANG MAI JOURNAL OF SCIENCE （ 影响因子：0.523； 五年影响因子：0.505 ）

ISSN： 0125-2526

年卷期： 2020 年 47 卷 6 期

页码：

收录情况： SCI

摘要： The biomimetic catalysts were used in catalytic oxidation of dibenzodioxocin (DBDO), a recalcitrant lignin model compound, and examined for conversion of organosolv lignin. The catalytic efficiency of Cu([H-2]salen), Co([H-2]salen), Cu([H-4]salen), Co([H-4]salen), Cu([H-4]salen)/Co([H-4] salen) was compared on the basis of the oxidation extent of DBDO. The combined biomimetic catalyst Cu([H-4]salen)/Co([H-4]salen), never used before in lignin oxidation, was found most effective among the five catalysts in transforming the model compound. The reaction pathway for catalytic oxidation of DBDO was also proposed according to the characterization upon the structural change and degradation products of DBDO, respectively with C-13-NMR and GC/MS. During oxidation of organosolv lignin, Cu([H-4]salen)/Co([H-4]salen) afforded much high percentage of carbonyl compounds in total degradation products (84.6%). The molecular weight of residual lignin samples obtained with GPC showed that Cu([H-4]salen)/Co([H-4]salen) could carry out the most extensive depolymerization of the lignin structure. The quantitative P-31-NMR allowed the focusing on the structural modifications induced on the lignin. The content beta-O-4> and DBDO units present in organosolv lignin markedly decreased with the enhanced catalysis by Cu([H-4]salen)/Co([H-4]salen). The data of hydroxyl groups further confirmed these findings.

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