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タイトル: | Gas- and solid/liquid-phase reactions during pyrolysis of softwood and hardwood lignins |
著者: | Asmadi, Mohd Kawamoto, Haruo https://orcid.org/0000-0002-4934-8054 (unconfirmed) Saka, Shiro |
著者名の別形: | 河本, 晴雄 |
キーワード: | Lignin Pyrolysis Reactions Gas phase Solid/liquid phase Softwood Hardwood |
発行日: | Nov-2011 |
出版者: | Elsevier B.V. |
誌名: | Journal of Analytical and Applied Pyrolysis |
巻: | 92 |
号: | 2 |
開始ページ: | 417 |
終了ページ: | 425 |
抄録: | Pyrolytic reactions of Japanese cedar (Cryptomeria japonica, a softwood) and Japanese beech (Fagus crenata, a hardwood) milled wood lignins (MWLs) were studied with thermogravimetry (TG) and by pyrolysis in a closed ampoule reactor (N2/600 °C). The data were compared with those of guaiacol/syringol as simple lignin model aromatic nuclei. Several DTG peaks were observed around 300–350, 450, 590 and 650 °C. The first DTG peak temperature (326 °C) of beech was lower than that (353 °C) of cedar. This indicates that the volatile formation from cedar MWL is slightly delayed in heating at 600 °C. The gas-phase reactions via GC/MS-detectable low MW products were explainable with the temperature-dependent reactions observed for guaiacol/syringol in our previous paper. The methoxyl groups became reactive at ∼450 °C, giving O–CH3 homolysis products (catechols/pyrogallols) and OCH3 rearrangement products (cresols/xylenols). The former homolysis products were effectively converted into gaseous products (mainly CO) at >550–600 °C. However, the GC/MS-detectable tar yields, especially syringyl unit-characteristic products, were much lower than those from guaiacol/syringol. Thus, contributions of higher MW intermediates and solid/liquid-phase reactions are more important in lignin pyrolysis. From the results of stepwise pyrolysis of char + coke fractions at 450 and 600 °C, the methoxyl group-related reactions (450 °C) and intermediates gasification (600 °C) were suggested to occur also in the solid/liquid phase. This was consistent with the DTG peaks observed around these temperatures. These solid/liquid-phase reactions reduced the tar formation, especially catechols/pyrogallols and PAHs. Different features observed between these two MWLs are also focused. |
著作権等: | © 2011 Elsevier B.V. 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/2433/150113 |
DOI(出版社版): | 10.1016/j.jaap.2011.08.003 |
出現コレクション: | 学術雑誌掲載論文等 |
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