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Characterization of a regenerable sorbent for high temperature elemental mercury capture from flue gas

机译：用于从烟气中捕获高温元素汞的可再生吸附剂的特性

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摘要

In this work we have developed a regenerable synthetic sorbent based on manganese oxides (12% w/w) impregnated on high surface area γ-alumina and supported as a thin layer (40 μm) onto cordierite honeycomb monoliths (400 cpsi). Such structured sorbents are well suited for flow-through exhaust gas treatment associated with very low pressure drop. Elemental mercury capture experiments were carried out in a lab-scale quartz reactor in air at temperatures ranging from 50 to 350℃, Hg concentration in the range 50-250 μg/m~3, GHSV = 3.6 × 10~5 h~(-1). A kinetic and capacity characterization of the sorbent was conducted, giving insight on the controlling mechanisms of the mercury capture process. Structured MnO_x sorbent performed satisfactorily up to 300℃, the performance decaying dramatically above this temperature when desorption of elemental Hg became predominant. TPD experiments after mercury uptake on the sorbent, showed that the sorbent could be completely regenerated at a temperature as low as 500℃. Repeated cycles of mercury adsorption/desorption did not lead to any significant reduction of the sorbent capacity towards mercury uptake. No significant mercury oxidation in the gas phase was observed under the operating conditions used in the experiments.
机译：在这项工作中，我们开发了一种基于可再生的合成吸附剂，该吸附剂基于浸渍在高表面积γ-氧化铝上的锰氧化物（12％w / w），并以薄层（40μm）负载在堇青石蜂窝整料（400 cpsi）上。这样的结构化吸附剂非常适合于与非常低的压降相关的流通式废气处理。在实验室规模的石英反应器中在空气中于50至350℃，汞浓度在50-250μg/ m〜3，GHSV = 3.6×10〜5 h〜（- 1）。进行了吸附剂的动力学和容量表征，从而深入了解了汞捕获过程的控制机理。结构化MnO_x吸附剂在高达300℃的温度下仍能令人满意地工作，当元素汞的脱附占主导地位时，在该温度以上，性能会急剧下降。吸附剂吸收汞后的TPD实验表明，该吸附剂可在低至500℃的温度下完全再生。汞吸附/解吸的重复循环不会导致吸附剂对汞吸收的能力有任何显着降低。在实验中使用的操作条件下，未观察到气相中的明显汞氧化。

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  • 来源
    《Fuel》 |2013年第6期|13-18|共6页
  • 作者

    Fabrizio Scala; Concetta Anacleria; Stefano Cimino;

  • 作者单位

    Istituto di Ricerche sulla Combustione - CNR, Piazzale Tecchio 80, 80125 Napoli, Italy;

    Istituto di Ricerche sulla Combustione - CNR, Piazzale Tecchio 80, 80125 Napoli, Italy;

    Istituto di Ricerche sulla Combustione - CNR, Piazzale Tecchio 80, 80125 Napoli, Italy;

  • 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

    mercury capture; flue gas; regenerable sorbent; manganese oxides; adsorption;

    机译：汞捕获烟气可再生吸附剂锰氧化物吸附;

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