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首页> 外文期刊>Solid Fuel Chemistry >THE INFLUENCE OF PRELIMINARY OXIDIZING MODIFICATION ON THE PROPERTIES OF ADSORBENTS FROM COALS
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THE INFLUENCE OF PRELIMINARY OXIDIZING MODIFICATION ON THE PROPERTIES OF ADSORBENTS FROM COALS

机译：初步氧化改性对煤中吸附剂性能的影响

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摘要

The influence of the oxidizing modification of coal with gaseous nitric acid (140 deg C) and acetyl nitrate (20 deg C) on the properties of adsorbents produced by activation with steam (700-850 deg C) or potassium hydroxide in an argon atmosphere (500-850 deg C) was investigated. In line with the results of EPR and IR spectroscopy, the oxidizing modification reforms the structure of the coal as a result of reactions of nitration, electrophilic substitution, and partial oxydestruction with the formation of oxygen functional groups and the incorporation of anions (NO~-_3 and AcO~-) into the coal skeleton. The modified coals are more reactive with respect to H_2O or KOH and form adsorbents (700-1000 m~2g~-1) under milder activation conditions. Methods of the selective action on the oxygen functional groups (decarboxylation, O-methylation, treatment with HCl or Ca(OH)_2, reduction with LiAlH_4) were used To determine the influence of various types of the groups on the nature of Development of the surface, the yield and adsorptivity of the activated carbons.
机译：用气态硝酸（140摄氏度）和硝酸乙酰基乙酸（20摄氏度）对煤进行的氧化改性对通过在氩气气氛中用蒸汽（700-850摄氏度）或氢氧化钾活化产生的吸附剂性能的影响（研究了500-850摄氏度）。根据EPR和IR光谱的结果，由于硝化反应，亲电取代反应和部分氧化分解反应（形成氧官能团和阴离子（NO〜- _3和AcO〜-）进入煤骨架。改性后的煤对H_2O或KOH的反应性更高，在较温和的活化条件下形成吸附剂（700-1000 m〜2g〜-1）。使用对氧官能团的选择性作用方法（脱羧，O-甲基化，HCl或Ca（OH）_2处理，LiAlH_4还原）来确定各种类型的基团对氧官能团发展性质的影响表面，活性炭的产率和吸附性。

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