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中文摘要：
在固定床反应器上研究了N2气氛下纳米氧化铁对单质汞的吸附脱除特性，探讨了吸附剂颗粒尺寸，反应床温度，停留时间及表面羟基基团对纳米氧化铁除汞性能的影响。研究表明，与普通氧化铁颗粒瞬间到达穿透相比，纳米氧化铁具有更强的汞吸附能力，相同条件下其80％穿透时间达到45min，XPS分析表明，纳米氧化铁表面S5％以上均为氧化态的汞。汞在纳米氧化铁上的吸附过程中化学反应起重要作用。在试验温度范围内，随着反应床温度增加，纳米氧化铁对汞的吸附陛能提高幅度显著。反应前后样品的红外光谱分析结果表明，纳米氧化铁表面主要是游离态的羟基参与了汞吸附反应。
英文摘要：
The characteristic of elemental mercury adsorption by nano-ferric oxide was evaluated on a fixed bed reactor in N2 atmosphere. The effects of particle size, temperature, residence time and surface hydroxyl on Hg-removal efficiency were discussed. The result shows that comparing with the immediate breakthrough when using common-size ferric oxide as Hg sorbent, nano-ferric oxide shows excellent Hg adsorption capability, and over 45 minutes for 80% breakthrough time was observed at the same condition. The result by XPS analysis shows that more than 85% of the total mercury on nano-ferric oxide surface is oxidized mercury, which means elemental mercury is mainly chemically adsorbed by the nano-ferric oxide. The increase of bed temperature can promote mercury adsorption, while the result by FTIR analysis shows that dissociative hydroxyl on the surface of nano-sorbent would participate in the reaction for mercury adsorption.
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