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Hemicellulose pyrolysis mechanism based on functional group evolutions by two-dimensional perturbation correlation infrared spectroscopy

机译：基于二维扰动相关红外光谱分析的基于官能团变化的半纤维素热解机理

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摘要

To gain an improved understanding of the hemicellulose pyrolysis mechanism, two-dimensional correlation infrared spectroscopy (2D-PCIS) was employed to analyze the functional group evolution in xylan chars between 200 and 600 degrees C, and through combination with the obtained volatiles releasing properties. Simultaneously, the pathway of xylan decomposition was deduced to illustrate the pyrolysis mechanism. The depolymerization and ring-opening reactions of xylan started at 200 degrees C. After that, it was mainly xylan matrix degradation reaction to form char structure which mainly consisted of phenyl rings and oxygen-containing cyclic compounds with aliphatic chains. With temperature increasing (300-450 degrees C), the decarbonylation reaction, removal of C=C and fatty chains reactions were intensified and the molecular structures of xylan char reconstructed to form fusedring compounds on the order of 1 x 2 and 2 x 2 through condensation. Dehydrogenation and polycondensation reaction of xylan increased at higher temperature (450-600 degrees C). The char structure was composed of high-order fused-ring compounds, and the production of H-2 and CH4 increased greatly.
机译：为了改善对半纤维素热解机制的理解，使用二维相关红外光谱（2D-PCIS）来分析200至600℃的木聚体中的官能团进化，并通过与所得挥发物释放性能的组合。同时，推导出木聚糖分解的途径以说明热解机制。木聚糖的解聚和开环反应在200摄氏度下开始。之后，它主要是木聚糖基质降解反应，形成炭结构，其主要由苯环和含氧环状化合物与脂族链组成。随着温度的增加（300-450℃），加剧脱羰反应，去除C = C和脂肪链反应，并重建Xylan Char的分子结构，以形成融合的化合物，在1×2和2×2的阶段中形成融合的化合物缩合。木聚糖的脱氢和缩聚反应在较高温度下增加（450-600℃）。炭结构由高阶熔融环化合物组成，H-2和CH4的产生大大增加。

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  • 来源
    《Fuel》 |2020年第may1期|117302.1-117302.9|共9页
  • 作者

    Yang Haiping; Li Shujuan; Liu Biao; Chen Yingquan; Xiao Jianjun; Dong Zhiguo; Gong Meng; Chen Hanping;

  • 作者单位

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China|State Grid Hunan Integrated Energy Serv Co Ltd Changsha 410007 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Coal Combust Wuhan 430074 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hemicellulose; Pyrolysis; Structural evolution; Two-dimensional perturbation correlation infrared spectroscopy;

    机译：半纤维素;热解;结构演变;二维扰动相关红外光谱;

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