文献类型：期刊文献

英文题名：In-situ catalytic oxidation of Hg0 via a gas diffusion electrode

作者：Xu, Yi[1];Cao, Limei[1];Sun, Wei[1];Yang, Ji[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2017

卷号：310

起止页码：170

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20164903088489);WOS:【SCI-EXPANDED(收录号:WOS:000390081500016)】；

基金：This research is based upon work supported by the National Natural Science Foundation of China (Project No. 21307032), the Postdoctoral Science Foundation (Project No. 2012M511062) and "the Fundamental Research Funds for the Central Universities." Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the supporting organizations.

语种：英文

外文关键词：Elemental mercury; Gas diffusion electrode; H2O2; HO

摘要：A diffusion electrochemical reactor was proposed to remove elemental mercury (Hg-0) from coal-fired flue gas. The experiments were carried out in an undivided column reactor with a self-made gas diffusion electrode (GDE) as cathode and Ti/IrO2 as anode. Hg-0 was oxidized when the simulated gas passed through GDE. It turned out that the removal of Hg-0 in electrochemical process was dominated by electro-generated H2O2 and free radicals on GDE interface or in the electrolyte. Under 70 degrees C, Hg-0 removal efficiency exceeded 90% after 40 min electrolysis. The effects of operation parameters were investigated and the results demonstrated that voltage, gas flow rate, and initial concentration of Hg-0 had significant influences on Hg-0 removal, especially the reaction temperature, electrolyte concentration and pH. H2O2 and HO center dot in the electrolyte were measured by UV-vis spectrophotometer and electron spin resonance (ESR), respectively. The above results show that electrochemical technique is a promising method for emission control of Hg-0 from coal-fired flue gas. (C) 2016 Elsevier B.V. All rights reserved.