中文摘要：

采用超声波辅助沉淀法制备氧化铁吸附剂,并采用低温氮吸附、扫描电镜（scanning electron microscope,SEM）、X射线衍射（X-ray diffraction,XRD）、X射线光电子能谱（X-ray photoelectron spectroscopy,XPS）等分析手段对样品进行了表征。利用固定床反应器,在模拟煤气条件下研究了氧化铁吸附剂脱除单质汞的特性及机理。结果表明,纯氮气气氛下氧化铁对汞的吸附效率低下,以物理吸附为主;然而在体积浓度为400 10 6的H2S通入条件下,氧化铁表现出很强的汞吸附能力,150℃下的吸附效率达到98%以上;H2S浓度在反应初期会影响汞的脱除效率,但随着反应的进行该影响逐渐减小;H2S存在时,氧化铁对汞的吸附遵循Eley-Rideal机制,即吸附态的硫S（ad）与Hg0发生反应,达到Hg0脱除的目的。

英文摘要：

Fe2O3 sorbents synthesized by ultrasonicassisted precipitation method were employed to remove elemental mercury（Hg0） in coal gas.The samples were characterized by low-temperature nitrogen adsorption,scanning electron microscope（SEM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS） analysis.Performance and mechanism of removing mercury by Fe2O3 were studied under simulated coal gas using a fixed-bed reactor.The experimental results show that the adsorption performance of Fe2O3 is relatively poor in nitrogen atmosphere,and physical adsorption dominates the mercury capture;Fe2O3 sorbents exhibit high Hg0removal activity when 400 10 6 H2S was introduced,more than 98% of Hg0 was removed at 150 ℃;H2S concentration affects Hg0 removal efficiency in the initial stage of reaction,but the effect decreases as the reaction proceeds.In the presence of H2S,Hg0 removal by Fe2O3 follows the Eley-Rideal mechanism,where adsorbed S（ad）reacts with gas-phase Hg0.