Instituto Nacional del Carbón (CSIC), Francisco Pintado Fe 26, 33011 Oviedo, Spain.
J Hazard Mater. 2013 Sep 15;260:869-77. doi: 10.1016/j.jhazmat.2013.06.026. Epub 2013 Jun 19.
This work demonstrates that regenerable sorbents containing nano-particles of gold dispersed on an activated carbon are efficient and long-life materials for capturing mercury species from coal combustion flue gases. These sorbents can be used in such a way that the high investment entailed in their preparation will be compensated for by the recovery of all valuable materials. The characteristics of the support and dispersion of gold in the carbon surface influence the efficiency and lifetime of the sorbents. The main factor that determines the retention of mercury and the regeneration of the sorbent is the presence of reactive gases that enhance mercury retention capacity. The capture of mercury is a consequence of two mechanisms: (i) the retention of elemental mercury by amalgamation with gold and (ii) the retention of oxidized mercury on the activated carbon support. These sorbents were specifically designed for retaining the mercury remaining in gas phase after the desulfurization units in coal power plants.
这项工作表明，含有纳米金颗粒分散在活性炭上的可再生吸附剂是从煤燃烧烟道气中捕获汞物种的高效、长寿命材料。这些吸附剂可以这样使用，即通过回收所有有价值的材料来补偿其制备所需的高投资。载体的特性和金在碳表面上的分散影响吸附剂的效率和寿命。决定汞的保留和吸附剂再生的主要因素是存在增强汞保留能力的反应性气体。汞的捕获是两种机制的结果：（i）与金汞齐化保留元素汞，（ii）在活性炭载体上保留氧化汞。这些吸附剂是专门为保留煤电厂脱硫装置后残留在气相中的汞而设计的。
