Pyrolysis behaviors and product distribution of Shengli Lignite at different heating rate and final temperature by TG-FTIR and Py-GC-MS
Pyrolysis behaviors and product distribution of Shengli Lignite at different heating rate and final temperature by TG-FTIR and Py-GC-MS
复制标题
通过TG-FTIR和Py-GC-MS研究胜利褐煤在不同升温速率和最终温度下的热解行为和产物分布
DOI：
10.1080/15567036.2019.1638994
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Zhu Xiaoqian
中科院分区：
文献类型：
--
作者：
Miao Zhenyong;Wan Yongjiang;He Qiongqiong;Pei Zhen;Zhu Xiaoqian
采用热重-傅里叶变换红外光谱分析(TG-FTIR)和热解-气相色谱-质谱仪(Py-GC-MS)研究了胜利褐煤在20℃/min和100℃/min升温速率下从常温到800℃的缓慢热解特性。最终温度对热解产物的影响较大。在800℃、20℃/min和100℃/min(来自Py-GC-MS)的条件下热解得到了各种脂肪族化合物和单环芳香族化合物，包括短链烯烃、醇和酮。但在400℃时，几乎没有得到短链脂肪族化合物，较快的升温速度(100℃/min)有利于得到长链脂肪族烷烃、醇和酸(正十六酸和十八酸)。这说明褐煤结构中的脂肪链是长链的，而短链的脂肪族化合物来自二次分解。双环化合物、单环芳香族化合物一直是重要的产物。实时傅里叶变换红外光谱显示，不同升温速率下的热解产物有明显差异。在较慢的热解过程(20℃/min)中，CO2的吸光度远高于其他热解过程，但在较快的热解过程(100℃/min)中，-OH、C=O、-COOH、C-CH3和芳香族C-H官能团显著提高了热解产物的多样性，因此在较大的升温速率下可能会产生更有价值的气液产物。还提供了某些特定温度下的产物(从DTG峰)用于反应分析。
The slow pyrolysis characteristics of Shengli lignite (SL) from ambient temperature to 800°C at heating rates of 20°C/min and 100°C/min were investigated by thermogravimetric analysis coupled with Fourier transform infrared spectrometry (TG-FTIR) and by pyrolysis coupled with gas chromatography-mass spectrometry (Py-GC-MS). The final temperatures had larger effect on the pyrolysis products. The pyrolysis at 800°C of 20°C/min and 100°C/min (from the Py-GC-MS) obtained a variety of aliphatic compounds and monocyclic aromatic compounds, including short-chain olefins, alcohols, and ketones. But at 400°C, almost no short-chain aliphatic compounds were obtained, and a faster heating rate (100°C/min) was beneficial for obtaining long-chain aliphatic alkanes, alcohols, and acids (n-Hexadecanoic acid and Octadecanoic acid). It provides evidence that the aliphatic chains in lignite structure were long-chain, and the short-chain aliphatic compounds were from the secondary decomposition. The bicyclic compounds, monocyclic aromatic compounds were always important products. The real-time FTIR showed obvious differences in the pyrolysis at different heating rates. In the slower pyrolysis process (20°C/min), the absorbance of CO2was much higher than that in the other processes, but in the faster pyrolysis process (100°C/min), the diversity of the pyrolysis products was substantially improved by the -OH, C = O, -COOH, C-CH3and aromatic C-H functional groups, so maybe more valuable gas/liquid products could be produced at larger heating rate. The products at some specific temperatures (from the DTG peaks) were also provided for the reaction analysis.