烟气
催化作用
化学
氮氧化物
吸附
选择性催化还原
催化氧化
X射线光电子能谱
无机化学
氧化还原
燃烧
氧气
化学工程
有机化学
工程类
作者
Pengying Wang,Sheng Su,Jun Xiang,Huawei You,Fan Cao,Lushi Sun,Yun Zhang
出处
期刊:Chemosphere
[Elsevier]
日期:2014-04-01
卷期号:101: 49-54
被引量:82
标识
DOI:10.1016/j.chemosphere.2013.11.034
摘要
MnOx–CeO2/γ-Al2O3 (MnCe) selective catalytic reduction (SCR) catalysts prepared by sol–gel method were employed for low-temperature Hg0 oxidation on a fixed-bed experimental setup. BET, XRD and XPS were used to characterize the catalysts. MnCe catalysts exhibited high Hg0 oxidation activity at low temperatures (100–250 °C) under the simulated flue gas (O2, CO2, NO, SO2, HCl, H2O and balanced with N2). Only a small decrease in mercury oxidation was observed in the presence of 1200 ppm SO2, which proved that the addition of Ce helped resist SO2 poisoning. An enhancing effect of NO was observed due to the formation of multi-activity NOx species. The presence of HCl alone had excellent Hg0 oxidation ability, while 10 ppm HCl plus 5% O2 further increased Hg0 oxidation efficiency to 100%. Hg0 oxidation on the MnCe catalyst surface followed the Langmiur–Hinshelwood mechanism, where reactions took place between the adsorbed active species and adsorbed Hg0 to form Hg2+. NH3 competed with Hg0 for active sites on the catalyst surface, hence inhibiting Hg0 oxidation. This study shows the feasibility of a single-step process integrating low-temperature SCR and Hg0 oxidation from the coal combustion flue gas.
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