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XPS study of pyrite-free coals subjected to different oxidizing agents

机译：不同氧化剂对无黄铁矿煤的XPS研究

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摘要

Surface composition of two of pyrite-free coals characterized by a high organic sulphur content subjected to oxidation by peroxyacetic acid, oxygen in 0.5 N Na_2CO_3 aqueous solution and air for 7 days at 125℃ were studied. Oxidation process followed the route: diffusion → chemisorption (formation of oxidized surface species) → further oxidation of surface species —> gasification. The extent of each stage was dependent on the structure of initial coal. PAA acid was found to be the most efficient oxidizing and desulphurizing agent. The role of pyrite was discussed. The removal of pyrite influenced the results of the oxidation process following it. The oxidation ability of the used media formed a similar sequence (PAA > O_2/Na_2CO_3 > air/125) for coal samples with or without FeS_2, but the numerical values of several parameters (the surface content of elements C, O, S, N; the type and number of oxygen-or sulphur-containing surface species) differed in both cases. The presence of FeS_2 increased oxidation rate but the overall effect depended on the starting amount of oxygen-containing surface species which in turn was influenced by the procedure of pyrite removal.
机译：以过氧乙酸，0.5 N Na_2CO_3水溶液中的氧气和空气在125℃下进行了7天的氧化处理为特征，研究了两种有机硫含量高的无黄铁矿煤的表面组成。氧化过程遵循以下路线：扩散→化学吸附（氧化的表面物种的形成）→表面物种的进一步氧化->气化。每个阶段的程度取决于初始煤的结构。发现PAA酸是最有效的氧化剂和脱硫剂。讨论了黄铁矿的作用。黄铁矿的去除影响了其后氧化过程的结果。对于有或没有FeS_2的煤样品，所用介质的氧化能力形成相似的顺序（PAA> O_2 / Na_2CO_3>空气/ 125），但几个参数的数值（元素C，O，S，N的表面含量） ；含氧或含硫表面物质的类型和数量在两种情况下都不同。 FeS 2的存在增加了氧化速率，但是总效果取决于含氧表面物种的起始量，而含氧表面物种的起始量又受黄铁矿去除程序的影响。

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