Low temperature oxidation of coals of different rank and different sulphur content
Low temperature oxidation of coals of different rank and different sulphur content
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DOI：
10.1016/s0016-2361(02)00364-2
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发表时间：
2003-04-01
期刊：
影响因子：
7.4
通讯作者：
Wachowska, H
中科院分区：
文献类型：
--
作者：
Pietrzak, R;Wachowska, H
对五种不同煤阶、不同硫含量的煤分别进行了过氧乙酸（PAA）、5%硝酸、0.5NNa_2CO_3水溶液中氧气氧化和125 ℃空气氧化7天的实验。氧化的过程中进行的煤样脱矿质的Radmacher方法，并另外为黄铁矿的煤样。对初始煤及其产物进行了工业分析、元素分析和光谱分析。最有效的氧化剂是5%HNO_3和PAA。作为氧化的结果，煤的有机组分的显著部分转化为酸溶性产物。根据不同的氧化剂，固体氧化产物中的硫的损失是不同的，并且对于用HNO 3和PAA氧化的煤样品是最高的。通过红外光谱检测氧化硫物种（S=O和-SO2）的形成。FTIR数据还提供了有关不同煤阶煤在氧化过程中分子结构演变的有用信息，特别是在羰基和脂肪族范围内（1800-1500和3500-2800 cm（-1））。(C)2002爱思唯尔科技有限公司。保留所有权利。
Five coals of different rank and of different content of sulphur were subjected to oxidation by peroxyacetic acid (PAA), 5% nitric acid, by oxygen in 0.5N Na2CO3 aqueous solution and the air oxidation for 7 days at 125 degreesC. The processes of oxidation were carried out for coal samples demineralised by the Radmacher method, and additionally for the pyrite-free coal samples. Proximate, elemental and spectral analyses of the initial coals and the products obtained from them were made. The most effective oxidising agents were 5% HNO3 and PAA. As a result of oxidation, a significant part of the organic components of coal is converted into acid soluble products. Depending on the oxidising agent, the loss of sulphur in the solid oxidation products was different and the highest for the coal samples oxidised with HNO3 and PAA. Formation of oxidised sulphur species (S=O and -SO2) was detected by IR spectroscopy. FTIR data also provide useful information on evolution of the molecular structure of different rank coals on oxidation, in particular in the carbonyl and aliphatic ranges (1800-1500 and 3500-2800 cm(-1)). (C) 2002 Elsevier Science Ltd. All rights reserved.