Evolution of Hydrogen Chloride and Change in the Chlorine Functionality during Pyrolysis of Argonne Premium Coal Samples
Evolution of Hydrogen Chloride and Change in the Chlorine Functionality during Pyrolysis of Argonne Premium Coal Samples
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DOI：
10.1021/ef3014234
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发表时间：
2013-01
期刊：
影响因子：
5.3
通讯作者：
N. Tsubouchi;Takeomi Saito;N. Ohtaka;Y. Ohtsuka
中科院分区：
文献类型：
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作者：
N. Tsubouchi;Takeomi Saito;N. Ohtaka;Y. Ohtsuka
为了了解煤热解过程中氯的化学性质，采用在线HCl监测技术和Cl 2 p X射线光电子能谱（XPS）方法研究了8个阿贡优质煤样在程序升温热解过程中HCl的析出动力学和氯官能团的变化.在390、520和600 °C下，HCl的释放速率曲线至少显示出三个明显的峰，这些峰的存在强烈依赖于煤的类型。在390 °C处的HCl峰仅用四种煤出现，并且通过水洗变得相当小，而在几乎所有煤中观察到的高于450 °C的高温峰在洗涤后没有显著变化。在许多情况下，高达1000 °C的HCl产率在50-90%的范围内，并且产率倾向于随着煤中原子Ca/Cl比的增加而降低。氯的XPS分析表明，煤中的氯在表面富集，并以无机和有机官能团形式存在。这...
In order to understand chlorine chemistry in coal pyrolysis, the dynamics of HCl evolution and changes in chlorine functional forms during temperature-programmed pyrolysis of eight Argonne premium coal samples have been examined with an online HCl-monitoring technique and by the Cl 2p X-ray photoelectron spectroscopy (XPS) method. The rate profiles of HCl evolved show at least three distinct peaks at 390, 520, and 600 °C, and the presence of these peaks depends strongly on the type of coal. The HCl peak at 390 °C appears with four coals alone and becomes considerably small by water washing, whereas the high-temperature peaks above 450 °C observed with almost all of the coals do not change significantly after washing. Yields of HCl up to 1000 °C are in the range of 50–90% in many cases, and the yield tends to decrease with increasing atomic Ca/Cl ratio in coal. The chlorine XPS analyses show that the chlorine in each coal is enriched at the surface and composed of inorganic and organic functional forms. Th...