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首页> 外文期刊>Environmental Science & Technology >Regenerable Cobalt Oxide Loaded Magnetosphere Catalyst from Fly Ash for Mercury Removal in Coal Combustion Flue Gas
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Regenerable Cobalt Oxide Loaded Magnetosphere Catalyst from Fly Ash for Mercury Removal in Coal Combustion Flue Gas

机译：粉煤灰可再生氧化钴负载的磁层催化剂去除煤燃烧烟气中的汞

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摘要

To remove Hg~0 in coal combustion flue gas and eliminate secondary mercury pollution of the spent catalyst, a new regenerable magnetic catalyst based on cobalt oxide loaded magnetospheres from fly ash (Co-MF) was developed. The catalyst, with an optimal loading of 5.8% cobalt species, attained approximately 95% Hg~0 removal efficiency at 150 ℃ under simulated flue gas atmosphere. O_2 could enhance the Hg~0 removal activity of magnetospheres catalyst via the Mars-Maessen mechanism. SO_2 displayed an inhibitive effect on Hg~0 removal capacity. NO with lower concentration could promote the Hg~0 removal efficiency. However, when increasing the NO concentration to 300 ppm, a slightly inhibitive effect of NO was observed. In the presence of 10 ppm of HCl, greater than 95.5% Hg~0 removal efficiency was attained, which was attributed to the formation of active chlorine species on the surface. H_2O presented a seriously inhibitive effect on Hg~0 removal efficiency. Repeated oxidation-regeneration cycles demonstrated that the spent Co-MF catalyst could be regenerated effectively via thermally treated at 400 ℃ for 2 h.
机译：为了去除燃煤烟气中的Hg〜0并消除废催化剂的二次汞污染，开发了一种基于粉煤灰（Co-MF）负载氧化钴磁层的新型可再生磁性催化剂。最佳负载率为5.8％的钴催化剂，在模拟烟气气氛下，在150℃时，去除率约为95％Hg〜0。 O_2通过Mars-Maessen机理提高了磁层催化剂的Hg〜0去除率。 SO_2对Hg〜0的去除能力具有抑制作用。较低浓度的NO可以提高Hg〜0的去除效率。然而，当将NO浓度增加到300ppm时，观察到NO的轻微抑制作用。在10 ppm的HCl的存在下，Hg〜0的去除效率大于95.5％，这归因于表面活性氯物种的形成。 H_2O对Hg〜0的去除率具有严重的抑制作用。重复的氧化-再生循环表明，用过的Co-MF催化剂可以通过在400℃下热处理2 h而有效地再生。

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  • 来源
    《Environmental Science & Technology》 |2014年第24期|14837-14843|共7页
  • 作者

    Jianping Yang; Yongchun Zhao; Junying Zhang; Chuguang Zheng;

  • 作者单位

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

  • 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);
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