Characterisation of model compounds and a synthetic coal by TG/MS/FTIR to represent the pyrolysis behaviour of coal
Characterisation of model compounds and a synthetic coal by TG/MS/FTIR to represent the pyrolysis behaviour of coal
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DOI：
10.1016/j.jaap.2003.10.005
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发表时间：
2004-06
影响因子：
6
通讯作者：
A. Arenillas;C. Pevida;F. Rubiera;Roberto García;J. J. Pis-J.
中科院分区：
文献类型：
--
作者：
A. Arenillas;C. Pevida;F. Rubiera;Roberto García;J. J. Pis-J.
煤的热解是加氢、燃烧和气化等一系列煤转化过程的初始伴随反应。然而，由于煤的组成本身的复杂性，很难清楚地描述煤的热解过程。以前已经使用过单一模型化合物，以便对煤的热解过程中发生的复杂过程提供更多的了解。然而，得到的图像是一个简化的图像，并省略了某些重要的方面，如煤的结构、不同表面基团之间的相互作用和交联键。这项工作中使用的方法包括通过固化单一的、定义明确的模型化合物的混合物来制备具有已知结构的合成煤SC。通过化学表征，表明SC具有高挥发分煤的宏观特征(工业分析和元素分析)。FTIR表征表明，SC的结构中存在与煤相似的官能团。在与质谱仪和傅立叶变换红外光谱仪(TG/MS/FTIR)相连接的热天平上进行了程序升温热解试验。合成煤的热行为(即热解试验中的失重率和气态化合物的演化曲线)与作为参考物质的高挥发分烟煤非常相似。使用SC的最大优点在于可以准确地确定其组成和结构，并用于后续的基础和力学研究中。
Coal pyrolysis is the initial, accompanying reaction of a number of coal conversion processes such as hydrogenation, combustion and gasification. However, because of the inherent complexity of coal composition, it is difficult to describe coal pyrolysis clearly. Single model compounds have been used before in order to provide additional insight into the complex processes that occur in the pyrolysis of coal. Yet the picture obtained is a simplified one and certain important aspects such as coal structure, interactions between different surface groups and cross-links are omitted. The approach used in this work involves the preparation of a synthetic coal, SC, with a known structure by curing a mixture of single, well-defined model compounds. By means of chemical characterisation, the SC was shown to contain the macroscopic features of a high volatile coal (proximate and ultimate analyses). FTIR characterisation revealed the presence of functional groups similar to those of coal in the structure of the SC. Temperature-programmed pyrolysis tests were performed in a thermobalance linked to a mass spectrometer and a Fourier transform infrared analyser (TG/MS/FTIR). The thermal behaviour of the synthetic coal (i.e., rate of mass loss and the evolution profiles of gaseous compounds during pyrolysis tests) is very similar to that of the high volatile bituminous coal which was used as a reference material. The great advantage of using SC lies in the fact that its composition and structure can be accurately determined and employed in subsequent applications in basic and mechanistic studies.