| 木质素热解/炭化官能团演变与焦炭形成 |
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| 引用本文： | 曹俊,肖刚,许啸,金保昇.木质素热解/炭化官能团演变与焦炭形成[J].东南大学学报(自然科学版),2012,42(1):83-87. |
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| 作者姓名： | 曹俊 肖刚 许啸 金保昇 |
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| 作者单位： | 1. 东南大学能源热转换及其过程测控教育部重点实验室,南京,210096
2. 东南大学能源热转换及其过程测控教育部重点实验室,南京210096;浙江大学能源清洁利用国家重点实验室,杭州310027 |
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| 基金项目： | 国家自然科学基金资助项目，国家重点基础研究发展计划(973计划)资助项目 |
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| 摘 要： | 为了深入理解生物质热解/炭化过程,制备功能型焦炭,采用热重红外联用仪研究了木质素热解/炭化官能团演变与焦炭形成,并对所形成焦炭进行了导电性测试.实验结果表明:木质素热解/炭化过程分为4个阶段:200℃以下为自由水的脱除阶段；200～ 500℃为热解阶段,焦炭开始形成；500～900℃时焦炭中C-C键和C-H键进一步断裂,苯环大部分已被解链或芳香族化,形成无定形炭,在此阶段,焦炭的电阻率迅速下降,由986 Ω·cm减小到0.6 Ω·cm；900～1400℃时,碳碳双键几乎完全消失,焦炭内部结构重组,形成了一种介于无定型结构和石墨结构之间的新结构,电阻率达到0.2Ω·cm,导电性进一步增强.
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| 关 键 词： | 木质素 焦炭 官能团 导电性 |
Functional groups evolvement and charcoal formation during lignin pyrolysis/carbonization |
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| Cao Jun
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Xiao Gang
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Xu Xiao
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Jin Baosheng.Functional groups evolvement and charcoal formation during lignin pyrolysis/carbonization[J].Journal of Southeast University(Natural Science Edition),2012,42(1):83-87. |
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| Authors: | Cao Jun Xiao Gang Xu Xiao Jin Baosheng |
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| Institution: | sheng1 (1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China) (2State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | In order to produce high added value functional charcoal by biomass,a thermo-gravimetric analyzer coupled with a fourier transform infrared spectrometry system(TG-FTIR) was applied to investigate the relationship with functional groups evolvement and charcoal formation during lignin pyrolysis/carbonization.And electrical resistivity of charcoals was also tested.Experiment results show that the moisture is volatilized below 200℃.Pyrolysis occurs at 200 to 500℃ and charcoal begins to form.At 500 to 900℃,C—C bonds and C—H bonds in charcoal break further,phenyls become aromatized and form amorphous carbon,meanwhile,electrical resistivity of charcoal is reduced rapidly from 986Ω·cm to 0.6Ω·cm.At 900 to 1400℃ the structure of charcoal gets reconstructed to form a new structure which lies between amorphous carbon and graphite.Meanwhile the electrical resistivity of charcoal is further reduced to lower,about 0.2Ω·cm. |
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| Keywords: | lignin charcoal functional groups electrical resistivity |
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