THE FATE OF NITROGEN FUNCTIONALITIES IN COAL DURING PYROLYSIS AND COMBUSTION
THE FATE OF NITROGEN FUNCTIONALITIES IN COAL DURING PYROLYSIS AND COMBUSTION
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DOI：
10.1016/0016-2361(95)98352-f
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发表时间：
1995-04-01
期刊：
影响因子：
7.4
通讯作者：
MOULIJN, JA
中科院分区：
文献类型：
--
作者：
WOJTOWICZ, MA;PELS, JR;MOULIJN, JA
用X射线光电子能谱(XPS)研究了几种煤及其半焦中氮的官能态。焦炭是在不同的严重程度条件下制备的，以捕捉在热解过程中发生的氮官能度的变化。已经证明，煤中以吡咯形式存在的氮在热处理后转化为吡啶官能团。氮的官能度与燃料结合氮在沸腾燃烧和低温煤焦氧化过程中转化为NO(X)和N2O有关。没有发现碳-氮在NO和N2O之间的分配强烈依赖于氮的官能度的证据。在本工作所用的实验条件下，发现吡咯和吡啶官能团以大约5：1的相同比例释放NO和N2O。
X-ray photoelectron spectroscopy (XPS) was used to investigate the nitrogen functional forms present in several coals and their chars. The chars were prepared under different severity conditions to capture transformations in nitrogen functionality occurring during pyrolysis. It has been demonstrated that nitrogen present in coal in pyrrolic forms is converted into pyridinic functionalities upon heat treatment. Nitrogen functionality was related to the conversion of fuel-bound nitrogen to NO(x) and N2O in fluidized-bed combustion and in low-temperature char oxidation. No evidence of a strong dependence on nitrogen functionality was found for char-N partition between NO and N2O. Under the experimental conditions used in this work, pyrrolic and pyridinic functionalities were found to release NO and N2O in the same proportion of about 5:1.