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Title: Role of methoxyl group in char formation from lignin-related compounds
Authors: Hosoya, Takashi
Kawamoto, Haruo  kyouindb  KAKEN_id
Saka, Shiro  kyouindb  KAKEN_id
Author's alias: 細谷, 隆史
河本, 晴雄
坂, 志朗
Keywords: Lignin
Pyrolysis
Char formation
Methoxyl group
o-Quinone methide
Diels–Alder reaction
Benzofuran
Xanthene
Issue Date: Jan-2009
Publisher: Elsevier BV
Journal title: Journal of Analytical and Applied Pyrolysis
Volume: 84
Issue: 1
Start page: 79
End page: 83
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 N2/600 °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.
Rights: © 2008. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
The full-text file will be made open to the public on 1 January 2011 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/240657
DOI(Published Version): 10.1016/j.jaap.2008.10.024
Appears in Collections:Journal Articles

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