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High capacity co-precipitated manganese oxides sorbents for oxidative mercury capture

机译：用于氧化汞捕获的高容量共沉淀锰氧化物吸附剂

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摘要

Removal of flue gas mercury (Hg) from coal-fired power plants continues to be a challenge and the search for improved sorbents is far from over. Manganese oxides supported on zirconium dioxide (MnO_x/ZrO_2) prepared by a co-precipitation method, were characterised and evaluated for Hg capture. Relationships between surface area, total pore volume, particle size distribution and mercury capture have been investigated. Material with a particle size range of 75-250 μm achieved the greatest Hg breakthrough. Overall, these are greater than those achieved for impregnated activated carbons with higher surface areas (585, 968 and 1014 m~2/g). Scanning electron microscopy and energy dispersive X-ray detection (SEM/EDAX) indicates that there is uneven dispersion of MnO_x and ZrO_2 in the sorbent materials, and two distinctive particle types can be identified - the more porous type, which is 'manganese-rich' (Mn-rich) and the more smooth with cracks type which is 'zirconium-rich' (Zr-rich). Agglomerations of mercury clusters were observed only on the surface of 'Mn-rich' particles, so the conclusion can be drawn that the rate of Hg capture on the particle surface area is dependent on manganese content and distribution.
机译：从燃煤电厂中去除烟道气汞（Hg）仍然是一个挑战，寻找改良吸附剂的工作远未结束。对通过共沉淀法制备的负载在二氧化锆（MnO_x / ZrO_2）上的锰氧化物进行了表征，并评估了汞的捕获。已经研究了表面积，总孔体积，粒度分布和汞捕获之间的关系。粒径范围为75-250μm的材料实现了最大的汞突破。总体而言，这些比具有更高表面积（585、968和1014 m〜2 / g）的浸渍活性炭所能达到的更高。扫描电子显微镜和能量色散X射线检测（SEM / EDAX）表明，吸附材料中MnO_x和ZrO_2的分散不均匀，并且可以识别出两种独特的颗粒类型-较多孔的类型，即“锰含量较高” ”（锰含量高）和带有“锆”（锆含量高）的裂纹类型更加光滑。仅在“富锰”颗粒表面上观察到汞簇的团聚，因此可以得出结论，颗粒表面积上的汞捕获速率取决于锰含量和分布。

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  • 来源
    《Fuel》 |2013年第7期|559-562|共4页
  • 作者

    Malgorzata M. Wiatros-Motyka; Cheng-gong Sun; Lee A. Stevens; Colin E. Snape;

  • 作者单位

    Department of Chemical and Environmental Engineering, University of Nottingham, NG7 2RD Nottingham, United Kingdom;

    Department of Chemical and Environmental Engineering, University of Nottingham, NG7 2RD Nottingham, United Kingdom;

    Department of Chemical and Environmental Engineering, University of Nottingham, NG7 2RD Nottingham, United Kingdom;

    Department of Chemical and Environmental Engineering, University of Nottingham, NG7 2RD Nottingham, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Manganese oxides; Mercury capture; Co-precipitation;

    机译：锰氧化物;汞捕获;共沉淀;

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