期刊
CHEMSUSCHEM
卷 7, 期 7, 页码 2022-2029出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201400079
关键词
EPR spectroscopy; gas chromatography; lignin; pyrolysis; radicals
资金
- Swiss National Science Foundation (SNF), NRP66 Resource Wood [406640_136892]
- Swiss National Science Foundation (SNF) [406640_136892] Funding Source: Swiss National Science Foundation (SNF)
Lignin pyrolysis is a promising method for the sustainable production of phenolic compounds from biomass. However, detailed knowledge about the radicals involved in this process and their influence on the molecular products is missing. Herein, we report on the pyrolysis of hard-and softwood Klason lignins under inert gas conditions in a temperature range between 350-550 degrees C. During the pyrolysis process, the formed radicals were detected by in situ high-temperature electron paramagnetic resonance spectroscopy. The overall formation of volatile products during lignin pyrolysis was determined using thermogravimetric analysis. The volatile molecular products were characterized and quantified using GC-MS analysis. Major differences were observed between hardwood and softwood lignins. Hardwood lignins form more radicals and volatile products than softwood lignins at temperatures from 350 to 450 degrees C. In the late stages of the pyrolysis process at 550 degrees C radical quenching reactions become dominant in hardwood lignins. We identified the disproportionation of two semiquinone radicals to quinone and hydroquinone species as the most likely quenching reaction. Our results show that both the pyrolysis temperature and the type of lignin source have a major influence on radical formation and the molecular products during the depolymerization of lignin.
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