XPS study of reductively and non-reductively modified coals
XPS study of reductively and non-reductively modified coals
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DOI：
10.1016/j.fuel.2003.08.004
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发表时间：
2004-02-01
期刊：
影响因子：
7.4
通讯作者：
Kozlowski, M
中科院分区：
文献类型：
--
作者：
Kozlowski, M
两种软化煤：Mequinenza和Illinois No.6在钾/液氨体系中进行还原和还原甲基化，并通过Liotta方法进行非还原甲基化。用经典的化学方法和X射线光电子能谱（XPS）方法对初始煤和所得产物进行了分析。煤的表面已被发现容易被大气中的氧气氧化，但表面和散装样品之间的元素组成的差异被证明是很小的。XPS谱的解卷积表明，在所有样品中氧的主要形式是醚和羟基氧，氮的主要形式是吡咯氮。还表明，最初的Mequinenza煤中的主要硫物质是硫化物硫，而Illinois No.6富含噻吩系统。实验结果证实了煤在钾/液氨体系中的改性可使某些噻吩化合物中的硫脱除。(C)2004爱思唯尔有限公司保留所有权利。
Two demineralised coals: Mequinenza and Illinois No. 6 have been subjected to reduction and reductive methylation in the potassium/liquid ammonia system and to non-reductive methylation by the Liotta method. The initial coals and the products obtained have been analysed by classical chemical methods and by the X-ray photoelectron spectroscopy (XPS) method. The coal surface has been found susceptible to oxidation by atmospheric oxygen, but the differences in the elemental composition between the surface and the bulk sample proved small. Deconvolution of the XPS spectrum has shown that the dominant form of oxygen in all samples is ether and hydroxyl oxygen and the dominant form of nitrogen is pyrrolic nitrogen. It has also been shown that the main sulphur species in the initial Mequinenza coal is sulphidic sulphur, while Illinois No. 6 is richer in thiophenic systems. The results have confirmed an earlier finding that modification of coals in the potassium/liquid ammonia system leads to elimination of sulphur from some thiophene compounds. (C) 2004 Elsevier Ltd. All rights reserved.