中文摘要：

采用均匀沉淀法制备纳米氧化锌吸附剂,并采用BET、XRD、XPS等分析手段对其进行表征.在固定床吸附实验台上,研究了吸附剂在N2和模拟煤气气氛下对单质汞的吸附特性,分析气体成分对纳米氧化锌脱汞性能的影响.结果表明,纳米氧化锌在纯N2气氛下的脱汞效率较低,以物理吸附为主;H2S的加入可以显著提高纳米氧化锌对汞的吸附,停止通入H2S后,脱汞效率仍能维持较长时间;CO和H2通过促进纳米氧化锌脱硫进而促进对汞的脱除.随着温度的提高,纳米氧化锌表面形成的单质硫逐渐减少,抑制了吸附剂对单质汞的吸附脱除.

英文摘要：

Nano-ZnO sorbents synthesized by a homogeneous precipitation method were characterized by BET （Brunauer-Emmett-Teller）, XRD （X-ray diffraction） as well as XPS （X-ray photoelectron spectroscopy） analysis. The adsorption of elemental mercury by nano-ZnO under nitrogen and simulated gas atmosphere was studied on a bench-scale fixed-bed apparatus. The effect of various gases on Hg0 removal performance by nano- ZnO was analyzed. The results show that the mercury removal efficiency of the nano-ZnO is relatively poor in nitrogen atmosphere. The presence of H2 S promotes the Hg0 removal by nano-ZnO observably and the mercury removal efficiency can be maintained for a long time even after stopping pass into H2 S. The presence of CO and H2 promotes the Hg0 removal because of desulfurization effect of nano-ZnO. As the temperature increases, the formation of elemental sulfur in the surface of the nano-ZnO decreases, which can suppress the removal of Hg0 by sorbent.