Dong Jie, Xu Zhenghe, Kuznicki Steven M
Department of Chemical and Materials Engineering, University of Alberta Edmonton, Alberta T6G 2V4, Canada.
Environ Sci Technol. 2009 May 1;43(9):3266-71. doi: 10.1021/es803306n.
Magnetic zeolite composites with supported silver nanoparicles are a new class of multifunctional materials with potential applications as recyclable catalysts, disinfectants, and sorbents. This study evaluated the suitability of the magnetic composites as sorbents for the removal of elemental mercury vapor from flue gases of coal-fired power plants. The sorbents were found to completely capture mercury at temperatures up to 200 degrees C, and the mercury capacity of the sorbents was found to be affected by the state, content, and size of the silver particles in the composite. Cumulative or extended thermal treatments at 400 degrees C were found to improve the mercury capture capacity, allowing the sorbent to be regenerated and recycled multiple times without performance degradation. The magnetic sorbent was readily separated from fly ash by magnetic separation, leaving the fly ash essentially free of sorbent contamination. In initial in-plant tests, the sorbents were able to capture mercury from the flue gases of an operational, full-scale, coal-fired power plant The combination of mercury capacity, ease of separation and regeneration, and recyclability makes these multifunctional magnetic composites excellent candidate sorbentsforthe control of mercury emissions from coal-fired power plants.
负载银纳米颗粒的磁性沸石复合材料是一类新型多功能材料，具有作为可回收催化剂、消毒剂和吸附剂的潜在应用价值。本研究评估了磁性复合材料作为吸附剂从燃煤电厂烟气中去除元素汞蒸气的适用性。研究发现，这些吸附剂在高达200摄氏度的温度下能完全捕获汞，且吸附剂的汞容量受复合材料中银颗粒的状态、含量和尺寸影响。研究发现，在400摄氏度下进行累积或延长热处理可提高汞捕获能力，使吸附剂能够多次再生和循环使用而不降低性能。通过磁选可轻松将磁性吸附剂与飞灰分离，使飞灰基本不受吸附剂污染。在最初的厂内测试中，这些吸附剂能够从一座运行中的全尺寸燃煤电厂的烟气中捕获汞。汞容量、易于分离和再生以及可回收性的结合，使这些多功能磁性复合材料成为控制燃煤电厂汞排放的优秀候选吸附剂。
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