A Multitechnique Characterization of Lignin Softening and Pyrolysis
A Multitechnique Characterization of Lignin Softening and Pyrolysis
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DOI：
10.1021/acssuschemeng.7b01130
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发表时间：
2017-07
影响因子：
8.4
通讯作者：
B. Shrestha;Y. L. Brech;Thierry Ghislain;S. Leclerc;V. Carré;F. Aubriet;S. Hoppe;P. Marchal;S. Pontvianne;N. Brosse;A. Dufour
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作者：
B. Shrestha;Y. L. Brech;Thierry Ghislain;S. Leclerc;V. Carré;F. Aubriet;S. Hoppe;P. Marchal;S. Pontvianne;N. Brosse;A. Dufour
了解木质素软化和热解对于开发木质纤维素生物精炼厂以生产碳纤维、聚合物添加剂、绿色芳烃或生物燃料非常重要。通过热重分析、量热法（用于玻璃化转变温度和热解反应热）、原位 1H NMR（用于分析木质素热转化时质子的迁移率）以及溶液态 13C 和 31P NMR（测定木质素中的官能团）对 Protobind 木质素（通过麦秆苏打制浆生产）进行了表征。原位流变学揭示了木质素随温度变化的实时粘弹性行为。加热后，木质素通过与解聚重叠的玻璃化转变发生软化，然后通过交联反应使软化材料固化。木质素残留物在流变仪中在软化和凝固区域的中点温度下淬火，并通过元素分析、GPC-U 进行进一步分析...
The understanding of lignin softening and pyrolysis is important for developing lignocellulosic biorefinery in order to produce carbon fibers, polymers additives, green aromatics, or biofuels. Protobind lignin (produced by soda pulping of a wheat straw) was characterized by thermogravimetry, calorimetry (for glass transition temperature and heat of pyrolysis reactions), in situ 1H NMR (for the analysis of the mobility of protons upon lignin thermal conversion), and solution-state 13C and 31P NMR (determination of functional groups in lignin). In situ rheology reveals the real-time viscoelastic behavior of lignin as a function of temperature. Upon heating, lignin undergoes softening, through glass transition overlapped with depolymerization, and is followed by the solidification of the softened material by cross-linking reactions. The lignin residues were quenched within the rheometer at the midpoint temperatures of softening and solidification regions and were further analyzed by elemental analysis, GPC-U...