Role of methoxyl group in char formation from lignin-related compounds
By Takashi Hosoya, H. Kawamoto, S. Saka. 2009
185 citations recorded by the source corpus.
Abstract Although char formation from lignin is an important process in wood pyrolysis, the molecular mechanism has not been clarified yet. In this study, the vapor-phase char formation of various lignin-related compounds was studied under the pyrolysis conditions of N 2 /600 °C/80 s. The methoxyl groups were found necessary for char formation. Interestingly, ethoxyl group was not effective in such char formation. Guaiacol and 2-ethoxyphenol gave pyrocatechol (formed through thermal homolysis of the O–R bonds) and the ether-rearranged products ( o -cresol, 2-ethylphenol, xanthenes and 2,3-benzofuran). The latter products are likely formed via an o -quinone methide intermediate, initiated from the H-abstraction of the phenolic hydroxyl groups. 2-Ethoxyphenol gave larger amounts of 2,3-benzofuran and less xanthenes and char than guaiacol, with yields of other products similar. Such reactivity difference is explainable with the different reactivities of the o -quinone methide intermediates. Based on the results, o -quinone methide is proposed as an important intermediate for lignin char formation during pyrolysis.
Subfields: Biomedical Engineering, Plant Science
View Paper: https://www.semanticscholar.org/paper/f42042bac37ba2af03ac1047ea8fe63b68017960
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Citations in the corpus
- Lignin utilization: A review of lignin depolymerization from various aspects (2019, unknown): “indicated that the methoxyl group from guaiacol is responsible for the significant amount of coke formation [69].”
- Lignin pyrolysis reactions (2017, background): “bearing guaiacol-, cresol-, catechol- and phenol-type aromatic nuclei (in a closed ampoule/N2/ 600 °C/ 80 s, with a final temperature of 569 °C) and 2-ethoxyphenol produced 2,3-benzofuran instead of coke [95].”