A series of Fe₆Mn₁Cu_x adsorbents for mercury removal were prepared by using co-precipitation and impregnation methods. The performance of mercury adsorption and anti-SO₂ characteristic was studied in a fixed-bed experimental system. The effect of Cu doping amount, reaction temperature, and flue gas components on mercury removal was investigated. The mercury species on the spent adsorbent was analyzed through Hg-TPD test. The physical–chemical features were characterized by using the N₂ adsorption/desorption, VSM, XPS, and XRD. It was found that the Fe₆Mn₁Cu_0.4 exhibited a high performance of mercury adsorption and well magnetic property and good sulfur resistance. Under high concentration of SO₂, the average adsorption efficiency of Fe₆Mn₁Cu_0.4 adsorbent achieved 99%. Cu modification optimized the pore structure and improved the mercury removal performance as well as SO₂ resistance. The XPS analysis indicated that Mn⁴⁺ was the main form that played an important role in oxidizing Hg⁰, as a result of decrement of Mn⁴⁺ after mercury adsorption. Mercury adsorbed on the spent adsorbent was HgO and HgSO₄.

中文翻译：

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Cu改性铁锰磁性汞吸附剂及其抗SO2特性

采用共沉淀法和浸渍法制备了一系列Fe ₆ Mn ₁ Cu _x脱汞吸附剂。在固定床实验系统上研究了汞的吸附性能和抗SO ₂特性。研究了Cu掺杂量、反应温度和烟气成分对脱汞的影响。通过Hg-TPD测试分析了废吸附剂上的汞形态。利用N ₂吸附/解吸、VSM、XPS和XRD对其物理化学特征进行了表征。研究发现Fe ₆ Mn ₁ Cu _0.4具有较高的汞吸附性能、良好的磁性能和良好的抗硫性能。在高浓度SO _{2下，Fe 6} Mn ₁ Cu _0.4吸附剂的平均吸附效率达到99%。 Cu改性优化了孔结构，提高了脱汞性能以及抗SO ₂性能。 XPS分析表明，Mn ^{4+是氧化Hg 0 的}主要形式，由于汞吸附后Mn ⁴⁺减少，因此对Hg 0 的氧化起重要作用。吸附在废吸附剂上的汞为HgO和HgSO ₄。