Analytical Instrumentation Center, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 South Taoyuan Road, Taiyuan 030001, People's Republic of China; State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China.
The Biorefinery Research and Engineering Center, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China.
Carbohydr Polym. 2015 Nov 20;133:163-70. doi: 10.1016/j.carbpol.2015.07.005. Epub 2015 Jul 13.
The thermal degradation of chitin biomass with various molecular structures was investigated by thermogravimetric analysis (TG), and the gaseous products were analyzed by connected mass spectroscopy (MS). The chemical structure and morphology of char residues collected at 750°C using the model substrates GlcNH2 and GlcNAc, were characterized systematically. The experimental results disclosed that one main mass loss stage was observed for each substrate. Chitosan samples with high molecular weight shown the more thermal stability, and chitin showed the highest thermal stability. Additionally, it was found that catalysts play a significant role during the pyrolysis. The gaseous evolution components, including NH3, H2O, CO, and CO2 were observed by on line MS. The experimental results disclosed that the obtained carbonaceous materials had lost the original hydrocarbon structure totally, and transformed into an aromatic structure with high carbon and nitrogen content, which was identified by XPS and solid state NMR.
采用热重分析（TG）研究了具有不同分子结构的甲壳素生物质的热降解，并通过连接质谱（MS）对气态产物进行了分析。系统地表征了使用模型底物 GlcNH2 和 GlcNAc 在 750°C 收集的炭残留物的化学结构和形态。实验结果表明，每个底物都观察到一个主要的质量损失阶段。高分子量的壳聚糖样品表现出更高的热稳定性，而甲壳素表现出最高的热稳定性。此外，发现催化剂在热解过程中起着重要的作用。通过在线 MS 观察到包括 NH3、H2O、CO 和 CO2 在内的气态演化成分。实验结果表明，所得的含碳材料完全失去了原始的烃结构，并转变成具有高碳和氮含量的芳香结构，这通过 XPS 和固态 NMR 得到了证实。
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