期刊
BIORESOURCE TECHNOLOGY
卷 332, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125142
关键词
Lignin; Preoxidation; Hydroconversion; Supercritical ethanol; Cu-based catalyst
资金
- National Key R&D Program of China [2018YFB1501500]
- China Postdoctoral Science Foundation [2020 M681454]
This study presented two counterexamples of lignin preoxidation-hydroconversion, indicating that preoxidation does not always promote the subsequent hydroconversion of lignin. It revealed the influence of lignin properties, preoxidation degree, and reaction conditions on the subsequent hydroconversion of preoxidized lignin.
In this study, two counterexamples of lignin preoxidation-hydroconversion were reported. First, two lignin feedstocks were preoxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in acetonitrile with various dosages (15%, 30%, and 60%). Then, these preoxidized lignins (HELOs and MWLOs) were hydroconverted in supercritical ethanol catalyzed by Cu/CuMgAlOx. Total yields from HELOs were all higher than those from HEL, indicating the good promotion of DDQ preoxidation on the subsequent hydroconversion of HELOs, especially with the DDQ dosage of 15%. Differently, the promotion effect of DDQ preoxidation on the hydroconversion of MWLOs depended on the DDQ dosage as well as the reaction time. Through the comparison of two counterexamples, this work bursted the myth that preoxidation can always promote the subsequent hydroconversion of lignin, revealed the influence of lignin property, preoxidation degree, and reaction conditions on the subsequent hydroconversion of preoxidized lignin, and presented the new insight into the preoxidation-hydroconversion strategy for lignin.
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