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首页> 外文期刊>Environmental Science & Technology >Different Catalytic Effects by Copper and Chromium on the Formation and Degradation of Chlorinated Aromatic Compounds in Fly Ash
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Different Catalytic Effects by Copper and Chromium on the Formation and Degradation of Chlorinated Aromatic Compounds in Fly Ash

机译：铜和铬对粉煤灰中氯化芳族化合物形成和降解的不同催化作用

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摘要

Fly ash from municipal solid waste incineration may catalytically enhance the formation and degradation of chlorinated aromatic compounds. The activities of three Deacon catalysts in this process were investigated in a statistically designed experiment. Chlorides of copper, chromium, and nickel were added to fly ash samples and the resulting samples heated at 300℃ for 2 h in an air atmosphere. The addition of copper increases the formation of all chlorinated aromatic compounds except the low chlorinated congeners of polychlorinated dibenzo-p-dioxins and dibenzofurans. The addition of chromium decreased the formation of most chlorinated aromatic compounds except the highest chlorinated species, where it was without effect. The addition of nickel did not show any significant effect. The outcome of the experiment can be interpreted as two competing processes: the chlorination of aromatic rings and the oxidation of carbon-carbon and carbon-oxygen bonds. The delicate balance between chlorination and oxidation could probably be further exploited to minimize both the emissions and the net production of chlorinated aromatic compounds from combustion.
机译：来自城市固体废物焚烧的粉煤灰可催化提高氯化芳族化合物的形成和降解。在统计学设计的实验中研究了三种Deacon催化剂在此过程中的活性。将铜，铬和镍的氯化物添加到粉煤灰样品中，并将所得样品在空气中于300℃加热2小时。铜的添加增加了所有氯化芳族化合物的形成，但多氯化二苯并-对-二恶英和二苯并呋喃的低氯化同类物除外。铬的添加减少了大多数氯化芳族化合物的形成，除了最高的氯化物种没有影响。镍的添加没有显示任何明显的作用。实验的结果可以解释为两个相互竞争的过程：芳环的氯化和碳-碳和碳-氧键的氧化。氯化和氧化之间的微妙平衡可能会被进一步利用，以最大程度地减少燃烧产生的氯代芳族化合物的排放量和净产量。

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  • 来源
    《Environmental Science & Technology》 |2007年第10期|p.3741-3746|共6页
  • 作者

    TOMAS OEBERG; BO BERGBAECK; ERIK OEBERG;

  • 作者单位

    Department of Biology and Environmental Science, University of Kalmar, SE-391 82 Kalmar, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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