Demethylation of a methoxy group to inhibit repolymerization during alkaline lignin pyrolysis

•Methoxy group demethylation can reduce the Ea of the late pyrolysis of lignin.•Methoxy group demethylation can reduce the yeild of lignin pyrolytic char.•Methoxy group can promote char formation via interaction with phenolic hydroxyl.•Iodocyclohexane not only promotes demethylation but also causes...

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Published inFuel (Guildford) Vol. 286; p. 119394
Main Authors Ma, Hao, Li, Tengfei, Wu, Shubin, Zhang, Xiaohua
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 15.02.2021
Elsevier BV
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Abstract •Methoxy group demethylation can reduce the Ea of the late pyrolysis of lignin.•Methoxy group demethylation can reduce the yeild of lignin pyrolytic char.•Methoxy group can promote char formation via interaction with phenolic hydroxyl.•Iodocyclohexane not only promotes demethylation but also causes ether-bond breakage. The methoxy group in lignin was demethylated using iodocyclohexane; then, lignins with different methoxy group contents and six model compounds were pyrolyzed at 600 °C to investigate the role of methoxy groups during lignin pyrolysis. The results indicated that iodocyclohexane modification not only promotes methoxy demethylation but also causes side chain ether bond breakage. Demethylation of the methoxy group could inhibit the repolymerization reaction and reduce the activation energy during later lignin pyrolysis, and could also promote the homolysis of Ar-Cα. The pyrolysis experiments of the model compounds showed that the methoxy group is not an essential factor for the formation of pyrolytic char; however, it could promote the repolymerization reaction by intramolecular interaction with phenolic hydroxyl.
AbstractList •Methoxy group demethylation can reduce the Ea of the late pyrolysis of lignin.•Methoxy group demethylation can reduce the yeild of lignin pyrolytic char.•Methoxy group can promote char formation via interaction with phenolic hydroxyl.•Iodocyclohexane not only promotes demethylation but also causes ether-bond breakage. The methoxy group in lignin was demethylated using iodocyclohexane; then, lignins with different methoxy group contents and six model compounds were pyrolyzed at 600 °C to investigate the role of methoxy groups during lignin pyrolysis. The results indicated that iodocyclohexane modification not only promotes methoxy demethylation but also causes side chain ether bond breakage. Demethylation of the methoxy group could inhibit the repolymerization reaction and reduce the activation energy during later lignin pyrolysis, and could also promote the homolysis of Ar-Cα. The pyrolysis experiments of the model compounds showed that the methoxy group is not an essential factor for the formation of pyrolytic char; however, it could promote the repolymerization reaction by intramolecular interaction with phenolic hydroxyl.
The methoxy group in lignin was demethylated using iodocyclohexane; then, lignins with different methoxy group contents and six model compounds were pyrolyzed at 600 °C to investigate the role of methoxy groups during lignin pyrolysis. The results indicated that iodocyclohexane modification not only promotes methoxy demethylation but also causes side chain ether bond breakage. Demethylation of the methoxy group could inhibit the repolymerization reaction and reduce the activation energy during later lignin pyrolysis, and could also promote the homolysis of Ar-Cα. The pyrolysis experiments of the model compounds showed that the methoxy group is not an essential factor for the formation of pyrolytic char; however, it could promote the repolymerization reaction by intramolecular interaction with phenolic hydroxyl.
ArticleNumber 119394
Author Wu, Shubin
Zhang, Xiaohua
Ma, Hao
Li, Tengfei
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  organization: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
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  givenname: Tengfei
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  givenname: Shubin
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  email: shubinwu@scut.edu.cn
  organization: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
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  givenname: Xiaohua
  surname: Zhang
  fullname: Zhang, Xiaohua
  organization: Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, Department of Chemistry, Jiangxi Agricultural University, Nanchang 330045, People’s Republic of China
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Keywords Repolymerization
Lignin
Pyrolysis
Demethylation
Methoxy group
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Snippet •Methoxy group demethylation can reduce the Ea of the late pyrolysis of lignin.•Methoxy group demethylation can reduce the yeild of lignin pyrolytic...
The methoxy group in lignin was demethylated using iodocyclohexane; then, lignins with different methoxy group contents and six model compounds were pyrolyzed...
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StartPage 119394
SubjectTerms Demethylation
Lignin
Methoxy group
Phenolic compounds
Phenols
Pyrolysis
Repolymerization
Title Demethylation of a methoxy group to inhibit repolymerization during alkaline lignin pyrolysis
URI https://dx.doi.org/10.1016/j.fuel.2020.119394
https://www.proquest.com/docview/2486866329
Volume 286
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