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タイトル: | Role of methoxyl group in char formation from lignin-related compounds |
著者: | Hosoya, Takashi Kawamoto, Haruo https://orcid.org/0000-0002-4934-8054 (unconfirmed) Saka, Shiro |
著者名の別形: | 細谷, 隆史 河本, 晴雄 坂, 志朗 |
キーワード: | Lignin Pyrolysis Char formation Methoxyl group o-Quinone methide Diels–Alder reaction Benzofuran Xanthene |
発行日: | Jan-2009 |
出版者: | Elsevier BV |
誌名: | Journal of Analytical and Applied Pyrolysis |
巻: | 84 |
号: | 1 |
開始ページ: | 79 |
終了ページ: | 83 |
抄録: | 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. |
著作権等: | © 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'. 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。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/240657 |
DOI(出版社版): | 10.1016/j.jaap.2008.10.024 |
出現コレクション: | 学術雑誌掲載論文等 |
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