Biomimetic One-Pot Mediated Oxygenolysis of Dibenzodioxocin Lignin Model and Organosolv Lignin Using M([H-4]salen) Complexes
文献类型： 外文期刊
作者： Zhou, Xue-Fei 1 ;
作者机构： 1.Quanzhou Normal Univ, Fujian Prov Key Lab Dev Bioact Mat Marine Algae, Quanzhou 362000, Peoples R China
2.Guangdong Univ Technol, Inst Environm Hlth & Pollut Control, Sch Environm Sci & Engn, Guangzhou Key Lab Environm Catalysis & Pollut Con, Guangzhou 510006, Peoples R China
3.Fujian Acad Agr Sci, Inst Agr Ecol, Fujian Prov Key Lab Agroecol Proc Hilly Red Soil, Fuzhou 350013, Peoples R China
4.Fujian Agr & Forestry Univ, Fujian Prov Key Lab Plant Funct Biol, Fuzhou 350002, Peoples R China
5.Kunming Univ Sci & Technol, Fac Chem Engn, Kunming 650500, Yunnan, Peoples R China
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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